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Применить Всего найдено 11981. Отображено 200.
27-01-2011 дата публикации

СПОСОБ ВНЕШНЕГО РАДИОЛОКАЦИОННОГО ВЫЯВЛЕНИЯ ФАКТА НАЛИЧИЯ ТРАЕКТОРНЫХ НЕСТАБИЛЬНОСТЕЙ ПОЛЕТА ВОЗДУШНОГО ОБЪЕКТА С МАЛЫМ КУРСОВЫМ УГЛОМ ПЕРЕМЕЩЕНИЯ

Номер: RU2410717C2

Заявленный способ относится к области радиолокационных измерений и предназначен для проверки наличия у воздушного объекта траекторных нестабильностей движения в виде рысканий планера. Сущность изобретения основана на изучении динамики протяженности доплеровских портретов, сформированных в последовательные моменты времени. Для этого оцифрованные значения квадратурных составляющих отраженных сигналов помещают в массив данных, из которого впоследствии извлекают частные массивы квадратур для формирования доплеровских портретов. Признаком наличия траекторных нестабильностей полета в виде рысканий выступает изменение структуры формируемых доплеровских портретов воздушного объекта, что обусловлено изменением угловой скорости поворота относительно радиолокационной станции при рысканиях планера. Методом формирования доплеровских портретов является процедура быстрого преобразования Фурье над частной выборкой отражательной характеристики объекта. Достигаемым техническим результатом изобретения является ...

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12-04-2023 дата публикации

СПОСОБ ОПЕРАТИВНОГО ПОИСКА И ОБНАРУЖЕНИЯ ПОДВОДНОГО ИСТОЧНИКА ЗВУКА

Номер: RU2794213C2

Изобретение относится к радиолокации поверхности океана с летательных аппаратов и может быть использовано при поиске и обнаружении подводных источников звука. Техническим результатом является обеспечение оперативного обнаружения источника звука на больших акваториях. В заявленном способе используют двухпозиционное визирование морской поверхности «квазизеркальным» радиолокатором бокового обзора, что обеспечивает ширину зоны обзора порядка 3Н, где Н – высота полета летательного аппарата, при высокой удельной эффективной площади рассеяния (УЭПР) поверхности порядка 1 (0 дБ). Квазизеркальный режим рассеяния с высокой УЭПР и возможность разделения частотных спектров вибросигнала и ветровых волн при когерентном детектировании импульсного радиосигнала позволяют выделить слабый вибросигнал с пространственно-временным осреднением на заданной площадке за время азимутального синтеза. 2 ил.

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10-01-2012 дата публикации

СПОСОБ ИДЕНТИФИКАЦИИ ОБЪЕКТОВ РАДИОЛОКАЦИОННОЙ СИСТЕМОЙ С СИНТЕЗИРОВАННОЙ АПЕРТУРОЙ

Номер: RU2439612C2
Принадлежит: ТЕЛЕСПАЦИО С.П.А. (IT)

В радиолокационной системе (1) с синтезированной апертурой, контролирующей область, содержащую, по меньшей мере, один подлежащий идентификации движущийся объект (2), данный объект оснащен устройством (3) идентификации, который получает радиолокационный сигнал (PC (RS)), передаваемый радиолокационной системой (1), и передает обработанный радиолокационный сигнал (ЭС (ES)), полученный посредством модуляции входящего радиолокационного сигнала (PC (RS)) посредством модулирующего сигнала (МОДС (MODS)), содержащего информацию о (ИД, СБЩ (ID, MSG)) об объекте (2), например, идентификационную информацию (ИД (ID)) и статусную информацию (СБЩ (MSG)) посредством усиления модулированного радиолокационного сигнала (PC (RS)); радиолокационный эхосигнал (РЭС (RES)), отраженный контролируемой областью и содержащий обработанный радиолокационный сигнал (ЭС (ES)), принимает и обрабатывает управляющая станция (8) радиолокационной системы (1), с обеспечением определения местоположения объекта (2) на карте контролируемой ...

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23-10-2019 дата публикации

Способ локации целей в передних зонах обзора бортовых радиолокационных станций двухпозиционной радиолокационной системы

Номер: RU2703996C2

Изобретение относится к средствам многопозиционной локации и картографирования земной поверхности с помощью бортовых радиолокационных станций (БРЛС), установленных на летательных аппаратах (ЛА). Технический результат изобретения - обеспечение возможности селекции неподвижных и движущихся целей с коррекцией координат движущихся целей на сформированном радиолокационном изображении. Сущность изобретения заключается в том, что в способе локации целей в передних зонах обзора БРЛС двухпозиционной радиолокационной системы, основанном на синхронном облучении участка исследуемой поверхности двухлучевыми антеннами с фазированными антенными решетками основной и дополнительной БРЛС, которые установлены на движущихся параллельными курсами на одной высоте ЛА, левый луч антенны основной БРЛС и правый луч антенны дополнительной БРЛС ориентированы вдоль векторов путевой скорости соответствующих ЛА и облучают переднюю зону обзора, одновременно правым лучом антенны основной БРЛС облучают область переднего ...

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27-06-2013 дата публикации

УСТРОЙСТВО ИСКАЖЕНИЯ РАДИОЛОКАЦИОННОГО ИЗОБРАЖЕНИЯ ОБЪЕКТА

Номер: RU2486538C2

Изобретение относится к области радиоподавления радиолокационных станций (РЛС), в частности, может быть использовано при разработке станций помех РЛС с синтезированной апертурой антенны (PCА). Достигаемый технический результат - снижение вероятности правильного обнаружения объекта до заданной средней величины. Указанный результат достигается тем, что устройство искажения радиолокационного изображения объекта состоит из N-канальной приемной и передающей антенных решеток, блока ввода значений эффективной площади рассеяния объекта, при этом каждый из N каналов содержит последовательно соединенные управляемый фазовращатель, управляемый усилитель и элемент передающей антенной решетки, каждый из N каналов также содержит полосовой фильтр, первый и второй фазовые детекторы, первый и второй аналого-цифровые преобразователи, вычислительное устройство, первый, второй и третий цифроаналоговые преобразователи, смеситель, а также опорный генератор, фазовращатель и запоминающее устройство, при этом выходы ...

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27-03-2007 дата публикации

ВЕРТОЛЕТНАЯ РАДИОЛОКАЦИОННАЯ СТАНЦИЯ ОБНАРУЖЕНИЯ НАЗЕМНЫХ ПРЕПЯТСТВИЙ

Номер: RU2296344C2

Изобретение относится к области радиолокации и может использоваться на вертолетах. Техническим результатом является обужение суммарной диаграммы направленности. Вертолетная радиолокационная станция обнаружения наземных препятствий состоит из антенной системы, первого и второго разделительных фильтров, вращающегося перехода, передающего устройства, циркулятора, приемного устройства, задающего генератора, цифрового процессора сигналов, включающего устройство обработки суммарно-разностной диаграммы, синхронизатора, датчика угла, цифрового процессора данных и индикатора, при этом в цифровой процессор сигналов введено устройство обужения суммарной диаграммы. 4 ил.

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22-03-2017 дата публикации

Способ формирования изображения земной поверхности в радиолокационной станции с синтезированием апертуры антенны

Номер: RU2614041C1

Изобретение относится к радиолокационной технике, в частности к аэрокосмическим бортовым радиолокационным станциям с синтезированием апертуры антенны (РСА), формирующим радиолокационные изображения (РЛИ) земной поверхности с использованием синтезирования антенного раскрыва (САР) в процессе сканирования этой поверхности диаграммой направленности антенны РСА. Достигаемый технический результат - уменьшение искажений формируемых РЛИ, возникающих за счет изменения доплеровского сдвига несущей частоты радиолокационных сигналов, отражаемых элементами земной поверхности, при перемещении носителя РСА. Указанный результат достигается за счет того, что способ формирования изображения земной поверхности в радиолокационной станции с синтезированием апертуры антенны заключается в объединении радиолокационных изображений парциальных участков земной поверхности, подлежащей радиолокационному обзору, получаемых посредством излучения и приема когерентных импульсов при облучении антенной РСА этих участков, ...

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02-10-2017 дата публикации

СПОСОБ ИДЕНТИФИКАЦИИ ЗАГРЯЗНЕНИЙ МОРСКОЙ ПОВЕРХНОСТИ

Номер: RU2632176C1

Изобретение относится к области для контроля экологического загрязнения шельфовых, прибрежных зон. Способ включает зондирование прибрежных акваторий, содержащих эталонные участки средствами, установленными на воздушно-космическом носителе с получением синхронных изображений в ультрафиолетовом и ближнем инфракрасном диапазоне с привязкой изображений по координатам системой позиционирования ГЛОНАСС, контрастирование кадров путем формирования синтезированных матриц из попиксельных отношений этих изображений, выделение контуров на поле синтезированных матриц, вычисление идентифицируемых параметров сигнала внутри контуров: пространственного спектра волнения F, фрактального объема Ω, площади рельефа Sвзволнованной поверхности анализируемого участка, оценка индекса состояния (И) загрязнения в виде зависимости от произведения идентифицируемых параметровТехнический результат – повышение достоверности идентификации аномалий морской поверхности, а также увеличение чувствительности измерений. 7 ил.

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20-03-2016 дата публикации

3D ГЕОРАДИОТОМОГРАФ

Номер: RU160453U1

... 1. Трехмерный (3D) георадиотомограф, отличающийся тем, что содержит: генератор сверхширокополосного (СШП) сигнала в режиме линейно-частотной модуляции (ЛЧМ), соединенный первым и вторым выходами соответственно с входом усилителя сигнала и первым входом смесителя, при этом выход усилителя сигнала соединен с входом блока электронных переключателей, который первым входом-выходом соединен с антенной решеткой, где антенная решетка формирует сигнал линейной поляризации, а ее модули каскадно объединены в линейку и каждый модуль состоит из 4 приемных и 4 передающих антенн для диапазона 0.5-2 ГГц и 8 приемных и 8 передающих антенн для диапазона 2-8 ГГц, а выход блока электронных переключателей соединен со вторым входом смесителя, выход которого соединен с входом квадратурного фазового детектора для регистрации сигнала, рассеянного от обнаруженных объектов и неоднородностей, выход которого соединен с вторым входом микроконтроллера, который выполнен с возможностью формировать синхроимпульсы для генерации ...

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27-01-2010 дата публикации

УСТРОЙСТВО ДВУХУРОВНЕВОГО НЕЙРОСЕТЕВОГО РАСПОЗНАВАНИЯ ВОЗДУШНЫХ ОБЪЕКТОВ ПО СОВОКУПНОСТИ ПРИЗНАКОВ

Номер: RU91185U1

Устройство двухуровневого нейросетевого распознавания воздушных объектов по совокупности признаков, содержащее антенну, антенный переключатель, передатчик, приемник, N полосовых фильтров, N блоков выделения признаков, N аналого-цифровых преобразователей, нейросетевой классификатор и индикатор, причем вход-выход антенны соединен со вход-выходом антенного переключателя, вход которого подключен к выходу передатчика, а выход - к входу приемника, выход которого соединен одновременно с входом каждого из N полосовых фильтров, выход каждого n-го из которых соединен с входом соответствующего n-го из N блоков выделения признаков, выход каждого из которых соединен с входом соответствующего n-го из N аналого-цифровых преобразователей, выход каждого из которых соединен с соответствующим n-м из N входов нейросетевого классификатора, отличающееся тем, что в его состав дополнительно вводят цифровой коммутатор, S нейросетевых идентификаторов и оперативное запоминающее устройство, причем выход каждого n-го ...

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10-01-2010 дата публикации

СПОСОБ ВЫБОРА ОПТИМАЛЬНОЙ ПРОДОЛЖИТЕЛЬНОСТИ ИНТЕРВАЛА СИНТЕЗИРОВАНИЯ В РАДИОЛОКАЦИОННОЙ СТАНЦИИ С ИНВЕРСНЫМ СИНТЕЗИРОВАНИЕМ АПЕРТУРЫ АНТЕННЫ

Номер: RU2378662C1

Изобретение относится к области радиотехники и может быть использовано в бортовых и наземных радиолокационных станциях с инверсным синтезированием апертуры антенны (ИРСА). Достигаемым техническим результатом изобретения является повышение качества формируемого в ИРСА радиолокационного изображения (РЛИ) на основе обнаружения момента появления погрешности, превышающей заданное значение в фокусирующем фильтре. Сущность изобретения заключается в том, что при работе дискретного фокусирующего фильтра, формирующего оценку изменения текущей дальности до наблюдаемой цели, осуществляется контроль точности формируемой оценки и обнаруживается момент появления погрешности, превышающей заданное значение, тем самым позволяя устранить эффект накопления нескомпенсированных фазовых ошибок, исключить возможность формирования расфокусированного изображения, своевременно остановить процесс инверсного синтезирования апертуры антенны. 10 ил.

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27-06-2009 дата публикации

СПОСОБ ВЫБОРА ИНТЕРВАЛА ИНВЕРСНОГО СИНТЕЗИРОВАНИЯ С РАССЧИТЫВАЕМОЙ УГЛОВОЙ СКОРОСТЬЮ ПОВОРОТА ЦЕЛИ ОТНОСИТЕЛЬНО РАДИОЛОКАТОРА

Номер: RU2360267C1

Изобретение относится к радиолокационным методам и может быть использовано в когерентно-импульсных радиолокационных станциях сопровождения цели для проведения инверсного синтезирования апертуры антенны, которое обеспечивает построение радиолокационных изображений целей в интересах их дальнейшего распознавания. Достигаемым техническим результатом изобретения является обеспечение возможности учета характера траекторных нестабильностей полета цели. Сущность изобретения заключается в том, что для наиболее обоснованного выбора длительности и положения интервала инверсного синтезирования предлагается анализировать сглаженную амплитудную отражательную характеристику воздушной цели, сформированную на избыточном, длительностью до 10 секунд интервале сопровождения. В процессе анализа получают корреляционную характеристику цели, которая после сглаживания указывает интервалы с максимальной и минимальной угловыми скоростями поворота цели относительно радиолокатора. Это позволяет определять интервал, ...

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10-06-2009 дата публикации

МНОГОЧАСТОТНАЯ РАДИОЛОКАЦИОННАЯ СТАНЦИЯ С ИНВЕРСНЫМ СИНТЕЗИРОВАНИЕМ АПЕРТУРЫ И ДВУХУРОВНЕВЫМ РАСПОЗНАВАНИЕМ ЦЕЛЕЙ

Номер: RU2358288C1

Изобретение относится к области радиолокационных измерений и направлено на улучшение распознавания воздушных целей. Достигаемый технический результат изобретения заключается в том, что устраняется недостаток радиолокационной станции с инверсным синтезированием апертуры и перестройкой частоты, заключающийся в несовпадении опорной частоты с частотой принятого сигнала вследствие превышения временем задержки отраженного сигнала периода повторения излучаемых импульсов, при этом двухуровневое построение устройства распознавания, использующее нейросетевую технологию, обеспечивает возможность проведения как классификации (установления класса), так и идентификации (определение конкретного типа) сопровождаемой цели. Указанный результат достигается дополнением прототипа схемой электронной задержки, системой измерения скорости, а также устройством двухуровневого нейросетевого распознавания, состоящего из накопительного буфера, блока обратного быстрого преобразования Фурье, оперативного запоминающего ...

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20-04-2011 дата публикации

СПОСОБ ПОВЫШЕНИЯ РАЗРЕШАЮЩЕЙ СПОСОБНОСТИ РЛС ПО УГЛУ ПРИ ПЕРЕДНЕБОКОВОМ ОБЗОРЕ

Номер: RU2416809C1

Изобретение относится к бортовым радиолокационным системам радиовидения с синтезированной апертурой антенны, позволяющим формировать радиолокационное изображение (РЛИ) контролируемого участка земной поверхности при боковом, переднебоковом обзоре или при обзоре в передней зоне в координатах дальность-азимут в течение допустимого времени синтезирования Тс. Достигаемый технический результат направлен на повышение разрешающей способности РЛС по углу при заданном времени Тс или, что эквивалентно сохранению разрешающей способности, при уменьшении времени Тс. Способ повышения разрешающей способности РЛС по углу при переднебоковом обзоре заключается в формировании на заданном промежутке времени РЛИ земной поверхности в координатах дальность-азимут, при этом синтезирование осуществляют одновременно в нескольких измерительных каналах антенной системы с последующей многоканальной обработкой синтезированных РЛИ.

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16-09-2024 дата публикации

КОСМИЧЕСКИЙ МНОГОРЕЖИМНЫЙ РАДИОЛОКАТОР С СИНТЕЗИРОВАННОЙ АПЕРТУРОЙ СО СКАНИРУЮЩЕЙ ГИБРИДНО-ЗЕРКАЛЬНОЙ АНТЕННОЙ

Номер: RU2826709C1

Изобретение относится к области радиолокации и может быть использовано при формировании радиолокационных изображений (РЛИ) земной поверхности с помощью радиолокаторов с синтезированной апертурой (РСА), размещаемых на космических аппаратах (КА). Техническими результатами являются: повышение радиометрической чувствительности РСА за счет снижения потерь в приемо-передающем СВЧ-тракте при передаче сигнала и снижения суммарного шум-фактора приемного тракта РСА; повышение оперативности переключения прожекторных и обзорных сканирующих режимов радиолокационной съемки; повышение энергоэффективности КА. Указанные технические результаты достигаются тем, что в космический многорежимный РСА со сканирующей гибридно-зеркальной антенной в состав РСА введено устройство формирования и оцифровки сигнала (УФОС), выход которого является выходом РСА, а в сканирующую зеркальную антенну введен параболический контррефлектор, фокус которого совпадает с положением фокуса рефлектора, облучающая система выполнена в ...

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11-01-2023 дата публикации

МНОГОФУНКЦИОНАЛЬНЫЙ МАЛОГАБАРИТНЫЙ РАДИОЛОКАТОР С СИНТЕЗИРОВАНИЕМ АПЕРТУРЫ АНТЕННЫ Ku-ДИАПАЗОНА

Номер: RU2787574C1

Изобретение относится к области радиолокации и предназначено для решения широкого круга задач при использовании на борту беспилотных летательных аппаратов (БЛА). Техническим результатом является создание радиолокатора с синтезированной апертурой антенны (МРСА) Ku-диапазона длин радиоволн, обеспечивающего на борту БЛА формирование целевой информации и ее точную привязку к геодезической системе координат. Он достигается за счет разработки системы, в состав которой входят: подсистема управления временной диаграммой работы, включающей бортовую цифровую вычислительную машину (БЦВМ), синтезатор частот и сихросигналов управления (СЧС); приемо-задающая подсистема, включающая БЦВМ, модуль приемопередатчика, содержащий СЧС, и антенную сборку (АС); подсистема процессорной обработки сигналов; передающая подсистема; подсистема управления положением луча антенны, включающая в свой состав привод азимута, привод наклона; подсистема навигационного обеспечения; подсистемы телеметрии. 3 ил.

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14-02-2023 дата публикации

Устройство формирования комплексного изображения на основе совмещения отдельных разнородных изображений с цифровой картой местности

Номер: RU2789857C1

Изобретение относится к бортовой многопозиционной технике и может быть использовано в системах комплексной цифровой обработки локационной информации. Техническим результатом изобретения является получение комплексного локационного изображения земной поверхности, а также повышение точности и помехозащищенности получаемого комплексного изображения земной поверхности в режиме реального времени. В состав заявленного устройства дополнительно введены блок разделения каналов и отдельные каналы обработки радиолокационной, тепловизионной и оптической информации, блоки формирования комплексного локационного изображения, совмещенного с цифровой картой местности (ЦКМ), блок принятия решения о выборе канала получения локационной информации и блок совмещения комплексного изображения с ЦКМ, соединенные между собой. Это позволяет за счет разделения каналов снизить влияние деструктивных факторов на формируемое изображение и тем самым повысить помехоустойчивость устройства. 3 ил.

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27-05-2001 дата публикации

АВИАЦИОННАЯ РАДИОЛОКАЦИОННАЯ СИСТЕМА БОКОВОГО ОБЗОРА ЗЕМЛИ

Номер: RU2168186C1

Изобретение относится к радиолокации, более конкретно к бортовым системам радиолокационного обзора Земли, устанавливаемым на авиационных носителях (самолетах, вертолетах). Для уменьшения трудоемкости и продолжительности работ по установке РСА на авиационный носитель, а также исключения необходимости доработки конструкции корпуса (фюзеляжа) носителя и изготовления радиопрозрачного обтекателя излучения и приема сигнала РСА можно осуществлять через штатный иллюминатор носителя. Однако при прохождении сигнала через иллюминатор может возникать значительное его ослабление до 3-4 дБ и более в одну сторону (6-8 дБ в две стороны), что снижает энергетический потенциал РСА. Поэтому целесообразность работы РСА через иллюминатор связана с возможностью существенного уменьшения этого ослабления с помощью дополнительно введенного согласующего устройства, устанавливаемого между раскрывом антенны и иллюминатором. Таким образом, достигаемый технический результат заключается в том, что в авиационной радиолокационной ...

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20-11-2007 дата публикации

КОСМИЧЕСКИЙ МНОГОРЕЖИМНЫЙ ПОЛЯРИМЕТРИЧЕСКИЙ РАДИОЛОКАТОР С СИНТЕЗИРОВАННОЙ АПЕРТУРОЙ СО СКАНИРУЮЩЕЙ ЗЕРКАЛЬНОЙ АНТЕННОЙ

Номер: RU2310886C1

Изобретение относится к космической радиолокационной аппаратуре для дистанционного зондирования Земли (ДЗЗ), использующей многофункциональные многорежимные, поляриметрические радиолокаторы с синтезированной апертурой антенны (РСА). Достигаемый технический результат изобретения - реализация поляриметрии в дополнение к прожекторному режиму работы РСА с зеркальной антенной. Указанный результат достигается путем введения дополнительных устройств в облучатель антенны, обеспечивающих электронное сканирование диаграммы направленности антенны в двух плоскостях и работу с ортогональными поляризациями. 2 ил., 1 табл.

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27-06-1998 дата публикации

СПОСОБ ОЦЕНКИ НЕЭВКЛИДОВЫХ ЭФФЕКТОВ, ВЛИЯЮЩИХ НА ИЗОБРАЖЕНИЕ, ПОЛУЧЕННОЕ ПРИ ПОМОЩИ СПУТНИКОВОЙ РАДИОЛОКАЦИОННОЙ СТАНЦИИ, И СПУТНИК, ПРЕДНАЗНАЧЕННЫЙ ДЛЯ РЕАЛИЗАЦИИ ЭТОГО СПОСОБА

Номер: RU2114445C1

Изобретение относится к технике радиотехнических измерений, а точнее к оценке смещения фазы электромагнитной волны, излученной спутниковой радиолокационной станцией при ее прохождении через ионосферу. Способ содержит формирование двух интерферограмм, полученных с помощью двух спутниковых радиолокационных станций, работающих соответственно на длинах волн λ1 и λ2, удовлетворяющих соотношению mλ1= nλ2, где m и n представляют собой некоторые целые числа, причем упомянутые радиолокационные станции установлены на одном и том же спутнике, а также осуществление линейной комбинации mλ1-nλ2 соответствующих фаз Φ1 и Φ2 первой и второй интерферограмм, причем дробная часть этой линейной комбинации является репрезентативной для неэвклидовых эффектов, оказывающих влияния на радиолокационные изображения, и позволяет измерить относительные небольшие перемещения земной поверхности. Устройство для реализации способа содержит средства, реализующие указанные действия. 2 с. и 2 з.п. ф-лы, 2 ил.

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20-12-1995 дата публикации

РЛС, ФОРМИРУЮЩАЯ ТРИ АПЕРТУРЫ

Номер: RU93030188A
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РЛС, формирующая три апертуры, относится к бортовым радиолокационным станциям с синтезированной апертурой. Изобретения повышает точность измерения радиальной скорости движущихся наземных целей. Сущность изобретения: вместо двух приемных трактов и процессора обработки амплитудного и фазового разбаланса радиолокационной станции в нее дополнительно введен синхронизатор, один выход которого соединен с передатчиком, а другой - с процессорами, реализующими операцию быстрого преобразования Фурье.

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20-04-1995 дата публикации

СПОСОБ КАРТОГРАФИРОВАНИЯ С ПОМОЩЬЮ СИНТЕЗИРОВАННОЙ АПЕРТУРЫ

Номер: RU93008773A
Автор: Ющенко В.П.
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Способ относится к области локации и может быть использован для получения картины сечения внутренних органов человека с целью диагностики, а также для картографирования непрозрачных в оптическом диапазоне сред или объемов вещества для выявления их внутренней структуры с высоким разрешением. Особенностью способа является то, что зондирование пространства осуществляют при относительном движении монохроматическим непрерывным сигналом, а разделение отраженного от объекта сигнала по дальностям осуществляют за счет скользящей свертки принятого доплеровского сигнала с опорными сигналами, представляющими собой зеркально перевернутые во времени сигналы, отраженные от точечных объектов с разных дальностей. Амплитуды сигналов, распределенных по дальностям перекодируют в конкретные или цветовые сигналы и разворачивают в координатах удаления от траектории относительного движения и расстояния, пройденного по траектории.

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10-10-1998 дата публикации

СПОСОБ ОЦЕНКИ НЕЭВКЛИДОВЫХ ЭФФЕКТОВ, ВЛИЯЮЩИХ НА ИЗОБРАЖЕНИЕ, ПОЛУЧЕННОЕ ПРИ ПОМОЩИ СПУТНИКОВОЙ РАДИОЛОКАЦИОННОЙ СТАНЦИИ, И СПУТНИК, ПРЕДНАЗНАЧЕННЫЙ ДЛЯ РЕАЛИЗАЦИИ ЭТОГО СПОСОБА

Номер: RU97107476A
Принадлежит:

... 1. Способ оценки неэвклидовых эффектов, оказывающих влияние на изображение, получаемое при помощи спутниковой радиолокационной станции (1, 2), в частности на смещение фазы, связанное с распространением электромагнитной волны, излученной данной радиолокационной станцией, сквозь ионосферу, отличающийся тем, что формируют первую (1с) и вторую (2с) интерферограммы на основе пар радиолокационных изображений (1а, 1б, 2а, 2б), полученных соответственно с использованием двух спутниковых радиолокационный станций (1, 2), работающих на длинах волн соответственно λ1и λ2 и выдерживающих соотношение mλ1= nλ2 , где m и n представляют собой некоторые целые числа, причем упомянутые две радиолокационные станции установлены на одном и том же спутнике; осуществляют линейную комбинацию nф1 - mф2 соответствующих фаз ф1 и ф2 первой и второй интерферограмм, причем дробная часть этой линейной комбинации является репрезентативной для упомянутых неэвклидовых эффектов, оказывающих влияние на упомянутые радиолокационные ...

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27-03-2011 дата публикации

УСТРОЙСТВО ДЛЯ ФОРМИРОВАНИЯ ИЗОБРАЖЕНИЯ ПРОВЕРЯЕМЫХ ОБЪЕКТОВ ПОСРЕДСТВОМ ЭЛЕКТРОМАГНИТНЫХ ВОЛН, ПРЕЖДЕ ВСЕГО ДЛЯ КОНТРОЛЯ ПАССАЖИРОВ НА НАЛИЧИЕ ПОДОЗРИТЕЛЬНЫХ ПРЕДМЕТОВ

Номер: RU2009135075A
Принадлежит:

... 1. Устройство для формирования изображения проверяемых объектов посредством электромагнитных волн, прежде всего, для контроля пассажиров на наличие подозрительных предметов со следующими признаками: ! антенна (1), которая излучает электромагнитные волны, прежде всего миллиметровые волны, ! средства для пространственной фокусировки излученных волн, и ! средства для манипуляции волнами в точке (5) точной фокусировки таким образом, что эта точка (5) служит в качестве подвижной виртуальной антенны для SAR-анализа, ! при этом средства для пространственной фокусировки содержат установленный с возможностью вращения фокусирующий или дефокусирующий квазиоптический элемент, а средства для манипуляции волнами в точке (5) точной фокусировки содержат рефлектор (4), ! отличающееся тем, что квазиоптический элемент (3) и рефлектор установлены с возможностью вращения вокруг общей поворотной оси (8) и с равной угловой скоростью. ! 2. Устройство по п.1, отличающееся тем, что квазиоптический элемент (3) и ...

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05-02-2020 дата публикации

Способ углового сверхразрешения в приемных цифровых антенных решетках

Номер: RU2713503C1

Изобретение относится к антенной технике, в частности к формированию диаграммы направленности цифровой антенной решетки для определения местоположения источников радиоизлучений. Техническим результатом является увеличение углового сектора, в котором выполняется различение угловых положений источников сигналов. Согласно изобретению по сигналам на выходе каналов реальной апертуры оценивают периоднизкочастотных пространственных колебаний квадратурных составляющих сигналов, доопределяют квадратурные составляющие сигналов на интервале, соответствующем найденному периодунаходят коэффициенты разложения в ряд Фурье квадратурных составляющих сигналов на интервалеопределяют квадратурные составляющие сигналов на выходах каналов виртуальной апертуры путем обратного преобразования Фурье при помощи рассчитанных коэффициентов Фурье, оценивают пеленгационный рельеф виртуальной апертуры по сформированной диаграмме направленности, при необходимости снижения побочных составляющих, при формировании используют ...

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14-01-2020 дата публикации

СПОСОБ ФОРМИРОВАНИЯ ДЕТАЛЬНЫХ РАДИОЛОКАЦИОННЫХ ИЗОБРАЖЕНИЙ В РЛС С СИНТЕЗИРОВАННОЙ АПЕРТУРОЙ АНТЕННЫ

Номер: RU2710961C1

Изобретение относится к радиолокации и может использоваться в радиотехнических системах непрерывного излучения, установленных на подвижных объектах, для получения радиолокационного изображения (РЛИ) в процессе дистанционного зондирования земной (водной) поверхности. Достигаемый техенческий результат - уменьшение требуемого объема памяти вычислительного устройства и времени формирования РЛИ. Способ формирования детальных радиолокационных изображений в РЛС с синтезированной апертурой антенны состоит в зондировании земной (водной) поверхности, приеме, оцифровке, интерполяции и сжатии по дальности отраженных сигналов, формировании двумерного дальностного портрета зоны обзора путем построчного запоминания в течение времени синтезирования апертуры сжатых по дальности в каждом периоде зондирования сигналов, формировании выборок отсчетов траекторного сигнала из сформированного двумерного дальностного портрета в соответствии с законами миграции точечных отражателей для каждого комплексного отсчета ...

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20-07-2015 дата публикации

СПОСОБ ФРОНТАЛЬНОГО СИНТЕЗИРОВАНИЯ АПЕРТУРЫ ЗЕМНОЙ ПОВЕРХНОСТИ С ИСКЛЮЧЕНИЕМ СЛЕПЫХ ЗОН В ПЕРЕДНЕЙ ЗОНЕ С ПОМОЩЬЮ МНОГОПОЗИЦИОННОЙ РАДИОЛОКАЦИОННОЙ СИСТЕМЫ

Номер: RU2014100672A
Принадлежит:

Способ фронтального синтезирования апертуры земной поверхности с исключением слепых зон в передней зоне с помощью многопозиционной радиолокационной системы, включающий от 2-х до N двухантенных систем с фазированными решетками, бортовые радиолокационные станции, устройства для обеспечения канала связи, отличающийся тем, что фронтальный участок земной поверхности посредством переднебокового обзора синхронно облучают зондирующими сигналами с помощью двух антенн с фазированными решетками, которые находятся на борту летательного аппарата (ЛА), при этом приемопередающие позиции, в зависимости от протяженности облучаемого фронтального участка земной поверхности, находятся на расстоянии d друг от друга таким образом, что облучаемые соседние зоны имеют перекрытие, и отраженные сигналы, принятые двумя антеннами, на борту каждого из N ЛА, сориентированные по заданному направлению для левого и правого переднебокового обзора, накапливают отраженные сигналы, и при их обработке формируют два радиолокационных ...

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10-06-2015 дата публикации

ВЫСОКОСКОРОСТНАЯ РАДИОЛИНИЯ ПЕРЕДАЧИ ИНФОРМАЦИИ С КОСМИЧЕСКИХ АППАРАТОВ ДИСТАНЦИОННОГО ЗОНДИРОВАНИЯ ЗЕМЛИ С АДАПТИВНОЙ БОРТОВОЙ АППАРАТУРОЙ

Номер: RU2551900C1

Изобретение относится к радиоканалам передачи цифровой информации, конкретно, к космическим высокоскоростным радиолиниям (ВРЛ) передачи данных наблюдения с космических аппаратов (КА) дистанционного зондирования Земли (ДЗЗ). Техническими результатами являются повышение скорости передачи данных зондирования путем адаптации (оптимизации) бортовой аппаратуры ВРЛ к параметрам текущего сеанса связи за счет оптимизации использования энергетического бюджета, а также повышение оперативности ВРЛ за счет использования «памяти» радиоканала для организации передачи данных потребителям в последовательности, заданной оператором системы ДЗЗ. Суть изобретения заключена в установке перед каждым сеансом связи сигнально-кодовой структуры передаваемого потока, оптимальной к конкретным параметрам приемных технических средств и условиям сеанса для обеспечения максимального уровня сигнала на входе наземного приемника, допустимого международным регламентом радиосвязи, и поддержания его в течение сеанса связи вне ...

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27-05-1996 дата публикации

УСТРОЙСТВО ОБРАБОТКИ СИГНАЛОВ РАДИОЛОКАЦИОННОЙ СТАНЦИИ БОКОВОГО ОБЗОРА

Номер: RU93030900A
Принадлежит:

Изобретение относится к области радиолокации и может быть использовано при предварительной обработке сигналов радиолокационной станции бокового обзора для передачи данных по радиоканалу. Техническим результатом является повышение достоверности информации о подстилающей поверхности, облучамой радиолокационной станцией бокового обзора с цифровой обработкой радиолокационных сигналов, принимаемых по траектории полета летательного аппарата. Устройство обработки сигналов радиолокационной станции бокового обзора содержит формирователь изображения, P каналов, спецпроцессор, кодер, передающее устройство. Новым является то, что в каждый из P каналов введены первое постоянное запоминающее устройство (ПЗУ), второе ПЗУ, блок регистровой памяти, первый блок регистров, блок вычисления сумм произведений, сумматор, умножитель, второй блок регистров, при этом первый вход первого ПЗУ соединен с первым выходом формирователя изображения, первый вход умножителя соединен с выходом первого ПЗУ, первый вход второго ...

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31-03-2025 дата публикации

Способ измерения кратковременных смещений на поверхности Земли

Номер: RU2837515C1

Изобретение относится к измерительной радиотехнике и может быть использовано в радиолокаторах с синтезированной апертурой антенны (РСА), устанавливаемых на борт аэрокосмических носителей, для измерения кратковременных смещений поверхности Земли. Технический результат: повышение оперативности и точности получения информации за один проход носителя РСА, а также упрощение системы измерения. Сущность: на борту одного носителя размещают один радиолокатор с синтезированной апертурой антенны (РСА) с одной антенной и с одним приемником РСА. Одной апертурой и одним каналом когерентной обработки сигналов осуществляют переднебоковой обзор в первом сеансе наблюдения и дальнейшем наборе сеансов наблюдения за одной и той же областью поверхности Земли путем излучения зондирующих сигналов и приема сигналов, отраженных от поверхности Земли, с синтезом набора радиолокационного изображения (РЛИ). После проведения серии сеансов наблюдения на интервале синтезирования осуществляют адаптивную фильтрацию дифференциальных ...

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30-12-1992 дата публикации

OПTИЧECKИЙ ПPOЦECCOP

Номер: RU1784957C
Автор:
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25-09-1997 дата публикации

Error correction process for synthetic aperture radar data

Номер: DE0019610502A1
Принадлежит:

The method operates on data from aircraft-borne synthetic aperture radar (SAR) and uses the correlation adaptive frequency shift estimator (CAFE) system. Successive azimuth data (1, 2) over a given time period DELTA t is fed into a multiplier (3) to give the Doppler frequency transfer. The result is subject to fast Fourier transformation (4) to give real frequency transfer and make visible the shift of the sinc-function (6). The Doppler rate relates in time to the movement error. Thus by applying the same process and algorithm of correlation adaptation a picture of maximum detection (7) can be achieved and phase errors, leading to geometric distortion and poor resolution, in the same azimuth range can be detected and automatically corrected.

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16-12-1976 дата публикации

Номер: DE0002529426A1
Автор:
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20-06-1985 дата публикации

PULSE TRANSMITTING RADAR APPARATUS

Номер: DE0003070653D1

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26-10-2017 дата публикации

Verarbeitungsvorrichtung für Signale eines Radars mit synthetischer Apertur

Номер: DE112015006123T5

Es wird eine Verarbeitungsvorrichtung für Signale eines Radars mit synthetischer Apertur gemäß der Erfindung angegeben, wobei die Höhe eines Streuzentrums in einem SAR-Bild abgeschätzt wird, das mit Sätzen von Sensoren beobachtet wird, wobei jeder Satz einer Basislinienlänge entspricht; dabei wird ein Pixel extrahiert, das dem Streuzentrum in der Höhe von dem SAR-Bild entspricht. Bei der Verarbeitung gemäß der erfindungsgemäßen Vorrichtung wird ein Topographiestreifen des SAR-Bildes erzeugt, das mit dem Satz von Sensoren beobachtet wird, welche der jeweiligen Basislinienlänge entsprechen. Dann wird die Phase des Topographiestreifens berechnet, der der spezifischen Höhe entspricht. Danach wird ein Pixel extrahiert, das die Phase von dem Topographiestreifen besitzt, was zur Extraktion des Pixels bei der spezifischen Höhe führt. Die Konfiguration gemäß der Erfindung kann eine spezifische Höhe extrahieren, die einer Kombination von Phasen entspricht, welche von mehreren Topographiestreifen ...

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30-03-2006 дата публикации

Verfahren und Vorrichtung zur interferometrischen Radarmessung

Номер: DE102004046041A1
Принадлежит:

Die Erfindung betrifft ein Verfahren zur interferometrischen Radarmessung mit mindestens zwei Synthetik-Apertur-Radar(SAR)-Systemen auf satelliten- und/oder flugkörpergestützten Plattformen, die einen gemeinsamen Oberflächenbereich mittels Mikrowellensignalen beleuchten, indem ein erstes SAR-System ein erstes Radarsignal auf einer ersten Sendefrequenz und mindestens ein zweites SAR-System mindestens ein zweites Radarsignal auf mindestens einer zweiten Sendefrequenz sendet. Dabei empfängt mindestens eines der mindestens zwei SAR-Systeme die auf dem gemeinsamen Oberflächenbereich reflektierten und interferierenden mindestens zwei Radarsignale, bestimmt aus den Interferogrammen Differenzphasen der empfangenen Radarsignale, ermittelt daraus eine Drift einer Systemuhr der mindestens zwei SAR-Systeme und kompensiert die ermittelte Drift.

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03-09-2009 дата публикации

Verfahren zur Erzeugung von mehreren SAR-Sendestrahlen und SAR-Antennensystem

Номер: DE0010319063B4
Принадлежит: ASTRIUM GMBH

Verfahren zur Erzeugung von Sendestrahlen mit einem SAR-Antennensystem, welches eine Mehrzahl von Antennenelementen aufweist, wobei innerhalb der Mehrzahl von Antennenelementen mehrere Gruppen mit jeweils mehreren benachbarten Antennenelementen definiert werden und eine Erzeugung mehrerer definierter Sendestrahlen jeweils durch Aktivierung einer einem Sendestrahl zugeordneten Gruppe von Antennenelementen erfolgt, wobei eine Abtastung einer Oberflächenregion durch benachbarte Sendestrahlen erfolgt, indem nacheinander mehrere benachbarte Gruppen von Antennenelementen aktiviert werden; dadurch gekennzeichnet, dass Gruppen mit unterschiedlicher Anzahl von Antennenelementen definiert werden und Sendestrahlen mit unterschiedlicher Ausdehnung durch Aktivierung der Gruppen mit unterschiedlicher Anzahl von Antennenelementen während der Abtastung der Oberflächenregion erzeugt werden.

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09-02-2006 дата публикации

Verfahren zur Verringerung des Dopplerzentroids bei einem kohärenten impuls-Radarsystem sowie Verwendung des Verfahrens

Номер: DE0010341893B4

Verfahren zur Verringerung des Dopplerzentroids bei einem kohärenten Impuls-Radarsystem mit synthetischer Apertur, das von einer sich bewegenden Satellitenplattform getragen wird und mit seiner Radarantenne einen Bodenstreifen mit zumindest annähernd konstanter Fluggeschwindigkeit abtastet, unter Verwendung sowohl einer Yaw-Winkel-Steuerung als auch einer Pitch-Winkel-Steuerung, wobei bei dem auf der Satellitenplattform betriebenen kohärenten Impuls-Radarsystem mit synthetischer Apertur der Dopplerzentroid über die gesamte Breite des Bodenstreifens auf ein Minimum dadurch reduziert wird, dass die Steuerung des Pitch-Winkels gemäß der Formel und die Steuerung des Yaw-Winkels entweder gemäß der Formel oder gemäß einer numerischen Berechnung des Yaw-Winkels durchgeführt wird, wobei i die Inklination, e die Exzentrizität, v die wahre Anomalie und N die Anzahl der Umläufe pro Tag darstellen und u für das Argument der geographischen Breite steht und die Summe aus der wahren Anomalie v und dem ...

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21-09-2000 дата публикации

Automatic guidance of robot vehicles in large industrial and manufacturing halls with radar station and multiple sector antenna on vehicle

Номер: DE0019910715A1
Принадлежит:

Radar station (1) on vehicle monitors hall in complete 360 degrees circle, sub-divided into four sectors, without gaps. It uses coherent microwave transmit impulses. Objects and hall walls back scatter echo signals. Echo signals are received by multiple sector antenna (2) and information from received echo signals is used to orient vehicle. Independent claim included for radar station.

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12-10-2017 дата публикации

Verfahren zur Erstellung eines Erdbeobachtungsbildes einer Region mittels eines Radars mit synthetischer Apertur

Номер: DE102016209803B3

Bei dem Verfahren wird ein Erdbeobachtungsbild einer Region mittels eines Radars mit synthetischer Apertur (SAR) und einer phasengesteuerten, aus Einzelantennen zusammengesetzten Gruppenantenne mit einem durch einen Steuerwinkel erzielbaren azimutalen Schwenkwinkelbereich erstellt. Jede Einzelantenne weist einen die Einzelantennenverstärkung in Abhängigkeit vom Raumwinkel beschreibenden Elementfaktor und die Gruppenantenne einen Arrayfaktor auf, der die sich aus der Anordnung und Anzahl der Einzelantennen ergebende Gruppenantennenverstärkung in Abhängigkeit vom Raumwinkel beschreibt, wobei die Gruppenantennenverstärkung mehrere Hauptmaxima aufweist, die im Wesentlichen gleich groß sind und die jedoch im Hinblick auf die Gesamtverstärkung, die sich aus dem Elementfaktor und der Gruppenantennenverstärkung ergibt, zu größer werdenden Steuerwinkeln hin abgeschwächt sind. Der nutzbare azimutale Schwenkwinkelbereich wird bei der Erfassung einer Region erweitert, und zwar durch mehrmaliges Einstellen ...

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26-03-2020 дата публикации

Verfahren zum Ermitteln einer Lageänderung eines Objektes

Номер: DE102018123334A1
Принадлежит:

Die Erfindung betrifft ein Verfahren zum Ermitteln einer Lageänderung eines Objektes mittels Daten eines Synthetic Aperture Radars (SAR) mit folgenden Schritten:Erfassen eines Radarbildes, welches das Objekt aufweist; Aufteilen des Radarbildes in mindestens zwei Teilbilder; Erfassen einer Kurzradarinformation, welche einen ersten reflektierten Puls (BES:, welcher vom Radar aufgenommen wurde,) und/oder eine daraus abgeleitete Größe aufweist, wobei der erste reflektierte Puls Informationen über Bilddaten des Radarbildes aufweist; für die Kurzradarinformation Durchführen eines Autofokusverfahrens, welches für die mindestens zwei Teilbilder jeweils eine Entfernungsänderung ermittelt; und Ermitteln der Lageänderung des Objektes, welche für jeden Punkt des Objekts gegeben ist durch die jeweilige Entfernungsänderung des entsprechenden Teilbilds.

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21-04-1994 дата публикации

Synthetic aperture radar equipment based on use of rotary antennae - overcomes range ambiguity by transmission of pulses having distinguishable characteristic in repetitive sequence

Номер: DE0004235071A1
Принадлежит:

The radar equipment correlates (11) a received signal with reference functions generated (13) and stored in memory (12). A quadrature demodulator (8) of the IF signal delivers outputs in phase and quadrature for digitisation (9) and buffer storage (10). The correlator is clocked (6) for each individual range interval in common with a ring counter (5) which sets the periodicity of pulse transmission in sequences with progressively increased frequency or varied pulse shape (e.g. pseudo-noise encoded signal design). ADVANTAGE - Unambiguously distinguishable response signals can be received and processed even at long ranges with aid of different characteristics of successive pulses.

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30-10-2008 дата публикации

ANTENNEN-RÜCKKEULEN-DÄMPFUNG

Номер: DE602004016697D1
Принадлежит: SAAB AB

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26-08-1976 дата публикации

MIT FREQUENZMODULIERTEN IMPULSEN ARBEITENDES SEITENSICHTRADARGERAET MIT IMPULSKOMPRESSIONSANORDNUNG

Номер: DE0001814200B2
Автор:
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27-04-1988 дата публикации

RADAR SYSTEMS

Номер: GB0008719395D0
Автор:
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07-01-1998 дата публикации

Acoustic and radar direction finding

Номер: GB0002314628A
Принадлежит:

There is disclosed an apparatus and method for acoustic direction finding particularly suited for digital interferometric bathymetric estimation using a chirp (swept frequency) source. The invention provides a digital acoustic direction finding apparatus for marine survey and other purposes comprising: means a for repeatedly sending out wideband acoustic signals, such as linear swept-frequency (chirp) pulses; one or more receiver acoustic apertures each consisting of one or more receiver transducers b1, b2; signal processing means d, e for sampling and storing echoes received by each transducer; signal processing means to quadrature match-filter each received echo by the recorded or estimated sampled source pulse and its Hilbert Transform, giving a sequence of complex-valued samples; signal processing means to determine the direction of one or more targets, or intercepts with an acoustic scattering surface such as the seabed surface or the surface of human tissue, using a combination of ...

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19-02-2003 дата публикации

Enhanced motion compensation technique in synthetic aperture radar systems

Номер: GB0002341995B
Принадлежит: LITTON SYSTEMS INC, * LITTON SYSTEMS INC

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07-02-1990 дата публикации

RADAR

Номер: GB0002221589A
Принадлежит:

A radar observing a target T which is instantaneously rotating about an unknown axis ZI (e.g. a ship which is both rolling and yawing) includes a system for determining the inclination of the axis ZI and hence the angular velocity omega of the target about ZI. The radar includes an antenna arrangement (10) which generates a sum signal V SIGMA and preferably, respective azimuth and elevation difference signals V DELTA A, V DELTA E. The difference signals are weighted by respective amounts alpha A, alpha E and combined vectorially to produce a resultant difference signal V DELTA , corresponding to a response pattern with a split plane at an orientation determined by the relative weightings. The sum and resultant difference signals are subjected to respective Fast Fourier Transforms to determine the magnitudes of the Doppler frequency components. The variation with Doppler frequency f of the ratio is then fitted (eg. using a least-mean-square-error algorithm) to a function of the form ...

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08-02-2012 дата публикации

Alignment of synthetic aperture radar images

Номер: GB0002482551A
Принадлежит:

A method of alignment of pairs of complex images (i.e. having magnitude and phase) of a region produced by separate passes of a synthetic aperture radar, selects a corresponding subset of each image in the form of a plurality of tiles, upsamples (oversamples) the tiles, crops (masks) one, and calculates a complex correlation value between corresponding pairs of tiles. Shifts in x and y for each corresponding pair of tiles where the correlation value exceeds a threshold are then used to calculate values for overall shift, rotation, stretch and shear to be applied to one of the images to align it with the other. An iterative least squares approach may be used. As both phase and amplitude information is used in the correlation the technique is suitable for aligning images having little intensity variation. The invention may be used to align images prior to coherent change detection analysis (CCD) of the images. The tiles cover a small proportion of the images (typically 1%), and may be uniformly ...

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22-01-2014 дата публикации

Method and apparatus for matching a model and an image of the same scene

Номер: GB0002504051A
Принадлежит:

A method and apparatus for matching a model and an image reproducing the same scene, by determining the transformation required between a frame of reference connected to the said model and a frame of reference connected to the said image comprises: means (2,3) for defining primitives and measurement points on the image and the model; means (5) for defining proximity lists formed from measurement points; and means (7, 10, 12) for determining possible transformation hypotheses, for filtering these hypotheses and for determining the required transformation. As described such matching is used in a navigational or landing aid for an aeroplane or missile using synthetic aperture radar.

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04-11-1992 дата публикации

A SYNTHETIC APERTURE RADAR

Номер: GB0008614824D0
Автор:
Принадлежит:

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25-10-1995 дата публикации

Sideways-looking radar

Номер: GB0009424731D0
Автор:
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15-06-2007 дата публикации

PROCEDURE FOR THE ILLUSTRATION OF AN OBJECT SCENE OF MEANS SCANNING RADAR

Номер: AT0000362116T
Принадлежит:

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15-03-2011 дата публикации

SYNTHETIK APERTURE RADAR PROCEDURE

Номер: AT0000500522T
Принадлежит:

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15-04-2010 дата публикации

PROCEDURE AND DEVICE FOR THE DETECTION OF MOVED OBJECTS OF MEANS SAR PICTURES

Номер: AT0000462148T
Принадлежит:

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15-09-2011 дата публикации

PROCEDURE FOR EXAMINING AN ICE AREA OR A DRY AREA OF MEANS RADAR ECHO PLUMB BOB SOUNDING

Номер: AT0000522829T
Принадлежит:

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15-10-1992 дата публикации

PROCESSING PARAMETER GENERATOR FOR RADAR WITH SYNTHETIC APERTURE.

Номер: AT0000080954T
Принадлежит:

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15-07-2001 дата публикации

DEVICE FOR DISCOVERING AND LOCATING GROUND TARGETS

Номер: AT0000202851T
Принадлежит:

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15-03-2005 дата публикации

SAR RADAR SYSTEM

Номер: AT0000290222T
Принадлежит:

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05-02-2015 дата публикации

Processing sar imagery

Номер: AU2011303657B2
Принадлежит:

A method and apparatus (1) for processing SAR imagery data, comprising: determining variance ratio data from the SAR imagery data; and processing, for use in change detection, the determined variance ratios data by making use of the F-distribution. The method may further comprise selecting a desired false alarm rate; and wherein making use of the F-distribution comprises determining a change detection threshold for the determined variance ratios data that is dependent upon the F-distribution and the desired false alarm rate. Another possibility is that making use of the F-distribution comprises using the F-distribution to determine probabilities for the determined variance ratios data.

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03-10-1991 дата публикации

PHASE DIFFERENCE AUTO FOCUSING FOR SYNTHETIC APERTURE RADAR IMAGING

Номер: AU0007291691A
Автор: NIHO YOJI G, YOJI G. NIHO
Принадлежит:

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27-04-2017 дата публикации

Navigational aid with adaptive radar

Номер: AU2015316666A1
Принадлежит: FPA Patent Attorneys Pty Ltd

A portable electronic navigational aid (104) e.g. for the blind (102), comprising a radio frequency, preferably millimeter wave, radar (218) with at least one transmitting (TX) channel and a plurality of receiving (RX) channels,at least one orientation sensor (220) con- figured to obtain data indicative of the orientation of the radar, and a processing element (210) configured to adaptively control (500, 602) thebeamforming of the radar based on the data provided by the ori- entation sensor. A corresponding method is presented. An accessory, such as a replaceable cover, containing a radio frequency radar for attaching to an electronic host device is presented.

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05-05-1994 дата публикации

Fast phase difference autofocus

Номер: AU0000648940B2
Принадлежит:

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24-04-1997 дата публикации

Combined SAR monopulse and inverse monopulse weapon guidance

Номер: AU0000677529B2
Принадлежит:

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05-12-1997 дата публикации

Subchirp processing method

Номер: AU0002936897A
Принадлежит:

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27-03-2003 дата публикации

SUB-SURFACE RADAR IMAGING

Номер: CA0002460455A1
Автор: BIGGS, ROGER TREDEGAR
Принадлежит:

Radar imaging apparatus comprises a single transmit antenna (4) and at least one receive antenna (5), scanning means (e.g. a pantograph) for mechanically scanning the antennas over a surface of interest (16), position providing means (e.g. a computer driving the pantograph via an X-Y drive and a stepper motor) providing a position signal indicative of the instantaneous position of the transceiver, control means for operating the transmit antenna in a stepped frequency continuous wave mode, signal analysing means for analysing amplitude and phase components (27, 28) of the receive antenna signal, and signal combining means for combining the output of said signal analysing means with said position signal as in a synthetic aperture array to provide a radar image signal of the surface and underlying features. The scan is two-dimensional (random or boustrophedral).

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11-08-2005 дата публикации

MEASUREMENT AND SIGNATURE INTELLIGENCE ANALYSIS AND REDUCTION TECHNIQUE

Номер: CA0002496943A1
Принадлежит:

Methods and apparatus compress data, comprising an In-phase (I) component and a Quadrature (Q) component. Statistical characteristics of the data are utilized to convert the data into a form that requires fewer bits in accordance with the statistical characteristics. The data may be further compressed by transforming the data and by modifying the transformed data in accordance with a quantization conversion table that is associated with the processed data. Additionally, redundancy may be removed from the processed data with an encoder. Subsequent processing of the compressed data may decompress the compressed data in order to approximate the original data by reversing the process for compressing the data with corresponding inverse operations. Interleaved I and Q components can be processed rather than separating the components before processing the data. The processed data type. may be determined by providing metadata to retrieve the appropriate quantization table from a knowledge database ...

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26-02-2008 дата публикации

COHERENT TWO-DIMENSIONAL IMAGE FORMATION BY PASSIVE SYNTHETIC APERTURE COLLECTION AND PROCESSING OF MULTI-FREQUENCY RADIO SIGNALS SCATTERED BY CULTURAL FEATURES OF TERRESTRIAL REGION

Номер: CA0002428513C
Принадлежит: HARRIS CORPORATION

An imaging system uses wideband RF daylight created by plural narrowband RF illumination sources, to passively generate spectrally different sets of RF scattering coefficients for multiple points within a prescribed three- dimensional volume being illuminated by the narrowband RF transmitters. To correct fot the lack of mutual coherence among different RF illumination sources, the respective sets of scattering coefficient data are applied to a cultral feature extraction operator, to locate one or more strong cultural features spatially common to multiple images. For spatial points along the extracted cultural feature theoretical scattering coefficients are calculated. Differences between phase values of these calculated scattering coefficients and those of the collected and processed scattering energy are used to modify the measured scattering coefficient values for all points in the illuminated region.

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15-10-2020 дата публикации

METHOD FOR PERFORMING BAR ACQUISITIONS WITH ENHANCED AZIMUTH RESOLUTION

Номер: CA3136289A1
Принадлежит:

The present invention concerns a method for performing SAR acquisitions, which comprises performing, in a time division fashion, SAR acquisitions of areas of a swath of earth's surface by means of a SAR system carried by an air or space platform; wherein performing SAR acquisitions in a time division fashion includes contemporaneously acquiring, in each pulse repetition interval, a plurality of areas of the swath that are separated in azimuth; and wherein the areas acquired in T successive pulse repetition intervals form an azimuth-continuous portion of said swath, T being an integer greater than one.

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30-09-1986 дата публикации

MOVING TARGET ORDNANCE CONTROL

Номер: CA1212167A

MOVING TARGET ORDNANCE CONTROL In an airborne radar system, moving ground targets are identified on a cathode ray tube (CRT) display and their motion tracked to allow precise delivery of air-to-ground weapons. Target location errors, due to the effect of target motion upon the doppler frequency of the received radar signals, are significantly reduced. The target's radial velocity with respect to the electrical boresight of the system antenna is determined and a corresponding frequency adjustment is made to the processed signal in order to accurately locate the target on the display to lie in precise correspondence to its displayed stationary surroundings. The measurement of target radial velocity also provides a precise interferometer antenna referenced azimuth angle estimate to be used for relative angle and azimuth weapon guidance, independent of usually large angle errors arising from clutter effects within the field of view of the antenna, and of other hardware and navigational error ...

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20-01-1976 дата публикации

RADAR DATA MAP CORRELATOR

Номер: CA981960A
Автор:
Принадлежит:

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13-11-1990 дата публикации

METHOD OF MOTION COMPENSATION IN SYNTHETIC APERTURE RADAR TARGET IMAGING AND A SYSTEM FOR PERFORMING THE METHOD

Номер: CA0001276273C
Принадлежит: KROGAGER ERNST, KROGAGER, ERNST

When determining the radar reflection cross-section of a radar target it is a known problem that one of the target motion components is to be compensated. This was done in the past by complicated numerical calculations of the path of the target. According to the described method, the motion compensation is determined by means of an auxiliary signal which is transmitted from the target. The described method enables the achievement of a radar reflection cross-section by real time data processing of the signals received. Also an apparatus for performing the method is described.

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24-09-1991 дата публикации

SYSTEM FOR DETECTING UNDERGROUND OBJECTS

Номер: CA0001289648C

A system for detecting underground objects is disclosed wherein image data obtained through a deep range-migration correction and image data obtained through a shallow range-migration correction are combined so that data at the corresponding positions on both the image data at high level may mutually intensify, whereas other data may mutually weaken. The target spot on the thus combined image data is made sharp and provides sufficiently high resolution.

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23-01-2007 дата публикации

SYNTHETIC APERTURE RADAR (SAR) SYSTEM

Номер: CA0002553008A1
Принадлежит:

In a multi-channel Synthetic Aperture Radar (SAR), a SAR group antenna with several receivers is reproduced by means of time-multiplexing a receiver, wherein each receive channel is assigned an antenna segment and, parallel to multiplexing a receiver, a different amplitude allocation is given to the antenna. More "virtual" channels than are physically present are provided, which is achieved by an increased pulse repetition frequency (PRF). The amplitude allocation of the antenna can be assigned during transmission, during receiving and during transmission and receiving. Multiplexing can be advantageously expanded by operating receivers in parallel mode and modifying the so-called "burst-mode technique", which is otherwise used in Scan-SAR systems. Used in multi-channel SAR and SAR interferometry, especially satellite applications.

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10-02-2008 дата публикации

PLATFORM SHAKE COMPENSATION METHOD IN SYNTHETIC APERTURE PROCESSING SYSTEM

Номер: CA0002556011A1
Автор: SAWA, TAKAO
Принадлежит:

The present information comprises the stages of: applying frequency analysis to positional information on a platform, generating virtual positional information on the platform based on a frequency analysis result; extracting a signal based on the generated virtual positional information; and performing a synthetic aperture processing based on the extracted signal, and in this. manner, even if the positional information lacking in precision and inaccurate is used, the shake compensation of the platform in the synthetic aperture processing system can be effectively performed.

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27-07-2000 дата публикации

ARRANGEMENT FOR THE INTERFEROMETRIC RADAR MEASUREMENT ACCORDING TO THE ROSAR PRINCIPLE

Номер: CA0002359252A1
Принадлежит:

... ▓▓▓The invention relates to an arrangement for the interferometric radar ▓measurement according to the ROSAR principle and to a device using said ▓principle. The inventive device comprises two coherent reception antennae ▓having two reception channels. The distance in the path between the two ▓distances of the antennae and the measured points of impact is calculated by ▓the wavelength .lambda. of the emitted radar signal and the measured phase ▓difference of the receiving echo of the two coherent reception channels. ▓According to the invention, the interferometric ROSAR arrangement is ▓integrated in or on a rotating device and positioned in such a way that the ▓entire area to be measured can be detected.▓ ...

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08-01-2019 дата публикации

OBJECT DETECTING DEVICE AND SENSOR DEVICE

Номер: CA0003014156C

The present invention is provided with: spectrum analysis units (32a), (32b), (32c) that analyze spectra of a beat signal extracted by a beat signal extracting unit (14) and beat signals extracted by other object detecting devices (1b), (1c), respectively; a search range width setting unit (33) that sets a frequency search range width; and a synthesis target selecting unit (34) that, for each of the spectra analyzed by the spectrum analysis units (32a), (32b), (32c), determines a frequency search range having the search range width set by the search range width setting unit (33), compares the spectrum components of frequencies existing within the search range with one another, and selects frequencies to be synthesized from among the frequencies existing within the search range.

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31-10-2019 дата публикации

UNDERBODY RADAR UNITS

Номер: CA0003097517A1
Принадлежит: SMART & BIGGAR LLP

Example embodiments relate to underbody radar units. An example radar system may involve a set of radar units coupled to an underbody of a vehicle such that each radar unit has a field of view below a bumper line of the vehicle. The set of radar units may include a first radar unit configured to measure an environment of the vehicle in a first direction and a second radar unit configured to measure the environment of the vehicle in a second direction. The second direction differs from the first direction. In some implementations, the first radar unit is positioned proximate a front bumper of the vehicle, and the second radar unit is positioned proximate a back bumper of the vehicle. Other example configurations may involve using more or fewer radar units coupled to the underbody of a vehicle.

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15-05-1990 дата публикации

EXTENDED SAR IMAGING CAPABILITY FOR SHIP CLASSIFICATION

Номер: CA0001269155C
Автор: BOLES, SOL
Принадлежит: OSLER, HOSKIN & HARCOURT LLP

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22-11-2007 дата публикации

METHOD FOR LOCALIZING OBJECTS BY MEANS OF AN IMAGING RADAR SYSTEM AND TRANSPONDER FOR LOCALIZING OBJECTS BY MEANS OF SUCH RADAR SYSTEMS

Номер: CA0002652142A1
Принадлежит:

The transponder (10) for localizing objects by means of an imaging radar system having radar signal compression and, in particular, a SAR system (rad ar with synthetic aperture) is provided with an antenna (12), which optional ly serves as a receiving antenna for receiving a radar transmission signal ( A) and as a transmitting antenna for a transponder transmission signal (F). Furthermore, the transponder (10) is provided with a decoupling unit (18), w hich is connected to the antenna (12) and which has an outlet for routing a radar transmission signal (A) received from the antenna (12) and an inlet de coupled from the outlet for routing a transponder transmission signal to be transmitted through the antenna (12), and a signal compression unit (14), wh ich compresses a received radar transmission signal (A) present at the outle t of the decoupling unit (18) into a signal compression pulse (C). The trans ponder has a delay unit (32) to delay the signal compression pulse (C) to ge nerate ...

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26-09-2017 дата публикации

METHOD FOR GENERATING IMAGE

Номер: CA0002898595C

A spotlight synthetic aperture radar (SAR) image is generated by directing randomly a beam of transmitted pulses at a set of two or more areas using a steerable array of antennas. Each area is illuminated by an approximately equal number of the transmitted pulses. Then, a reconstruction procedure is applied independently to received signals from each area due to reflecting the transmitted pulses to generate the image corresponding to the set of areas.

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28-08-2014 дата публикации

METHOD FOR GENERATING IMAGE

Номер: CA0002898595A1
Принадлежит:

A spotlight synthetic aperture radar (SAR) image is generated by directing randomly a beam of transmitted pulses at a set of two or more areas using a steerable array of antennas. Each area is illuminated by an approximately equal number of the transmitted pulses. Then, a reconstruction procedure is applied independently to received signals from each area due to reflecting the transmitted pulses to generate the image corresponding to the set of areas.

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09-10-2014 дата публикации

ROTARY ANTENNA, SCANNER USING SUCH AN ANTENNA, AND DEVICE FOR INSPECTING PERSONS

Номер: CA0002923655A1
Принадлежит:

The antenna comprises at least one waveguide having a rectangular section (24) and a cylinder (21) having an opening along a helical line, said cylinder having a rotary movement relative to the waveguide placed inside said cylinder, the waveguide being open opposite the inner face of said cylinder, which forms a microwave short-circuit to close the guide, characterised in that two cavities (62, 63) are provided on either side of the guide, parallel to same, along the whole length of same, the openings of the cavities being substantially in the plane of the opening (61) of the guide. The invention applies, for example, to the detection of concealed objects carried by persons, in particular dangerous objects.

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29-10-2019 дата публикации

WAVEGUIDE RADIATOR, ARRAY ANTENNA RADIATOR AND SYNTHETIC APERTURE RADAR SYSTEM

Номер: CA0002857658C
Принадлежит: ASTRIUM GMBH

Described is a waveguide radiator which comprises a slotted waveguide (10; 30) with a plurality of transverse or longitudinal slots (23; 32) provided in the waveguide (10; 30) and which comprises an additional inner conductor (14; 34) provided in the waveguide (10; 30), wherein the inner conductor (14; 34) is formed, depending on the alignment of the slots (12, 32) in such a manner that the result is a feed according to the traveling wave principle, wherein all slots (12; 32) of the waveguide (10; 30) can be excited with identical phase.

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17-01-2017 дата публикации

PROCESSING SYNTHETIC APERTURE RADAR IMAGES FOR SHIP DETECTION

Номер: CA0002897541A1
Принадлежит:

Systems and methods relating to SAR image processing and object detection within a SAR image. A sea clutter model in which the texture random variable is drawn from a finite and discrete set of values is used in the processing of SAR derived images. SAR images are divided into sub-images, each sub-image being processed in turn. A statistical test is applied to each sub-image to determine whether it contains pixels representing only non-clutter information. The statistical test is based on the sea-clutter model, parameters of which are derived and adapted from each sub-image. The model is designed such that it will not permit more than a pre-determined number of false alarms. Pixels in each sub-image with information other than clutter are clustered, according to proximity, into object detections. Detections from all sub-images are combined to provide global object detection and to group clusters that may have split across sub-image boundaries.

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28-05-1993 дата публикации

PHASE DIFFERENCE AUTOFOCUS

Номер: CA0002083906A1
Принадлежит:

FAST PHASE DIFFERENCE AUTOFOCUS A phase difference autofocus method that only requires one FFT for estimating a phase error in the entire synthetic array radar data The phase difference autofocus method of the present invention automatically and efficiently estimates phase errors from radar signals, allowing a well focused SAR image to be produced. The present method comprises the following steps. First, each range bin is divided into two subar-rays. Next, the two subarrays are complex-conjugate multiplied together to produce a cross spectrum of the two submaps produced by the subarrays. Then, the phases of each cross spectrum are aligned with an accumulated sum of the cross spectrums from previous processed range bins. The phase aligned cross spectrum is then added to the accumulated cross spectrum sum. All range bins are processed to get a final cross spectrum sum. Next, a single FFT is performed on the final cross spectrum sum to produce the cross correlation function. Then, the cross ...

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30-01-1995 дата публикации

AUTO-FOCUSING CORRECTION FOR ROTATIONAL ACCELERATION EFFECTS ON INVERSE SYNTHETIC APERTURE RADAR IMAGES

Номер: CA0002128683A1
Принадлежит:

Inverse synthetic aperture radar imaging systems that are used to image targets that undergo rotational accelerations are enhanced by signal processing techniques which provide correction factors to reduce the frequency-shift and frequency-stretch errors that occur due to such accelerations. A target scan is subdivided into a number of sub-apertures and a Fast Fourier Transfer (FFT) is performed on the data for each subaperture to provide associated frequency sub-images. The FFT is then subdivided in "sub-swaths" of amplitude versus frequency for a plurality of frequency bands. The change-of-frequency, or frequency shift, data between prominent scattering points of each sub-image are processed to provide a phase correction factor that incorporates range changes and translational acceleration distortions for additional scattering points other than the most prominent scattering point. A frequency-stretch correction factor that compensates for rotational acceleration distortion is also provided ...

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04-06-2018 дата публикации

Устройство построения радиолокационного изображения с помощью радиолокационной станции с синтезированной апертурой

Номер: RU0000180088U1

Устройство построения радиолокационного изображения с помощью радиолокационной станции с синтезированной апертурой относится к радиолокации, в частности к радиолокационным средствам обзора земной поверхности, и может быть использовано при дистанционном зондировании земной поверхности.Использование заявляемого устройства позволяет обеспечивать поточный прием, обработку откликов зондирующего сигнала и высокоскоростную (до 600 Мб/с) передачу РЛИ с разрешением до 0,5 м в режиме реального времени с возможностью настройки параметров устройства при зондировании земной поверхности с атмосферных и внеатмосферных летательных аппаратов на дистанциях от 0,1 до 1000 км зондирования для частотно-модулированных и частотно-манипулированных сигналов.Обработка откликов зондирующих сигналов от объектов земной поверхности производится во временной области с применением сверхбольших интегральных схем в составе заявляемого устройства. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 180 088 U1 (51) МПК G01S 13/90 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК G01S 13/90 (2006.01); G01S 13/89 (2006.01); G01S 13/9011 (2006.01) (21)(22) Заявка: 2016124861, 21.06.2016 (24) Дата начала отсчета срока действия патента: Дата регистрации: 04.06.2018 (45) Опубликовано: 04.06.2018 Бюл. № 16 2485545 C2, 20.06.2013. US 6781541 B1, 24.08.2004. JP 2009074918 A, 09.04.2009. CN 103592647 A, 19.02.2014. (54) УСТРОЙСТВО ПОСТРОЕНИЯ РАДИОЛОКАЦИОННОГО ИЗОБРАЖЕНИЯ С ПОМОЩЬЮ РАДИОЛОКАЦИОННОЙ СТАНЦИИ С СИНТЕЗИРОВАННОЙ АПЕРТУРОЙ (57) Реферат: Устройство построения радиолокационного времени с возможностью настройки параметров изображения с помощью радиолокационной устройства при зондировании земной поверхности станции с синтезированной апертурой относится с атмосферных и внеатмосферных летательных к радиолокации, в частности к радиолокационным аппаратов на дистанциях от 0,1 до 1000 км средствам обзора земной поверхности, и может зондирования для частотно- ...

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03-05-2012 дата публикации

Synthetic aperture radar (sar) imaging system

Номер: US20120105276A1
Автор: Robert Ryland
Принадлежит: Northrop Grumman Systems Corp

One embodiment of the invention includes a synthetic aperture radar (SAR) system including a receiver configured to receive a plurality of reflected radar pulses corresponding to a plurality of radar transmission pulses having been reflected from a target region. A processing controller divides the target region into a plurality of tiles at a highest data layer and each of the plurality of tiles into a plurality of sub-tiles corresponding to one of a plurality of data layers and iteratively processes a portion of pulse data corresponding to a given tile associated with a higher data layer to generate pulse data corresponding to a given sub-tile in a lower data layer. An image processor is configured to generate a radar image of the target region based on the pulse data corresponding to each of the plurality of sub-tiles associated with a lowest data layer of the plurality of data layers.

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17-05-2012 дата публикации

Method and apparatus for determining a doppler centroid in a synthetic aperture imaging system

Номер: US20120119943A1
Принадлежит: Institut National dOptique

There is described a method for determining a Doppler centroid in a synthetic aperture imaging system, comprising: receiving raw data representative of electromagnetic signals reflected by a target area; selecting, among the raw data, at least two sets of sub-area data each representative of electromagnetic signals reflected by a corresponding sub-area of the target area, the sub-areas being substantially aligned along an azimuth axis of the target area and having a substantially identical surface area; for each one of the sets of sub-area data, generating an image corresponding to the corresponding sub-area; and measuring a mean intensity of the image; and estimating the Doppler centroid from a skew of an intensity function representing the mean intensity as a function of a look number for the corresponding sub-area.

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04-10-2012 дата публикации

Apparatus and method for sampling and reconstruction of wide bandwidth signals below nyquist rate

Номер: US20120250748A1
Автор: Lam H. Nguyen, Trac Tran
Принадлежит: US Department of Army

A method and system of reconstructing data signals from one of incomplete measurements comprising a receiver for receiving data signals, an ADC system operatively connected to the receiver that digitizes the received data signal at a slower rate than the Nyquist rate to obtain sparse measurements; first and second dictionaries comprising a plurality of time shifted responses recovered from the data signal; the first dictionary comprising time shifted versions of the previously observed data signals which are sampled at or above the Nyquist minimum sample rate; the second dictionary comprising time shifted versions are sampled below the Nyquist minimum, and at least one processor for reconstruction of the waveform signals by transforming the sub-Nyquist digitized output using the first and second dictionaries to produce the data signal.

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10-01-2013 дата публикации

Signal processing methods and apparatus

Номер: US20130009806A1
Автор: Mike Newman
Принадлежит: THALES HOLDINGS UK PLC

A signal processor performs a signal transform of a signal, and comprises a signal demodulator for demodulating said signal by a first chirp signal having a first chirp rate to obtain a reduced bandwidth chirped signal, a filter for filtering the reduced bandwidth chirped signal and delaying the reduced bandwidth chirped signal by an interval proportional to a reciprocal of said first chirp rate, a signal modulator for modulating said filtered signal by a second chirp signal having a second chirp rate to obtain an increased bandwidth chirped signal and to provide a time domain output spectrum of said signal, and wherein each of said first chirp signal and said second chirp signal is a complex signal representing a linear frequency modulated chirp.

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18-04-2013 дата публикации

APPARATUS FOR MEASURING THE EARTH SURFACE MOVEMENT BY MEANS OF SAR IMAGES WITH AT LEAST ONE ELECTROMAGNETIC WAVE REFLECTOR

Номер: US20130093610A1
Принадлежит:

An apparatus is described for measuring the earth surface movement by means of SAR images; the apparatus comprises at least one SAR radar () placed on a satellite or on an aeroplane and at least one electromagnetic wave reflector () placed on an earth surface portion to be measured. The at least one SAR radar comprises means () for transmitting an electro-magnetic signal () onto said reflector and means () for acquiring the electromagnetic signal () reflected from the reflector; said SAR radar is adapted to acquire reflected signals along ascendant () and descendant () orbits. The reflector comprises, in a single piece, a first trihedron () configured for reflecting the signal transmitted by the SAR radar along ascendant orbits () and a second trihedron () configured for reflecting the signal transmitted by the SAR radar along descendant orbits (). 110111601261505125035123212231322333212231322333235. Apparatus for measuring the earth surface movement by means of SAR images , said apparatus comprising at least a SAR radar () placed on a satellite or an aeroplane and at least one electromagnetic wave reflector () placed on a earth surface portion to be measured , said at least one SAR radar comprising means () for transmitting an electromagnetic signal () onto said reflector and means () for acquiring the electromagnetic signal () reflected from the reflector , said SAR radar being adapted to acquire reflected signals along ascendant () and descendant () orbits , characterized in that said reflector comprises in a single piece a first trihedron () configured for reflecting the signal transmitted by the SAR radar along ascendant orbits () and a second trihedron () configured for reflecting the signal transmitted by the SAR radar along descendant orbits () , each one of said first trihedron () and said second trihedron () comprising two side surfaces ( , , , ) and a base ( , ) , said side surfaces ( , , , ) being orthogonal to each other and to the base ( , ) , said ...

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02-05-2013 дата публикации

Single-pass barankin estimation of scatterer height from sar data

Номер: US20130106651A1
Принадлежит: Raytheon Co

Traditional multi-pass radar techniques are not suitable for missions in which the aerial platform both identifies and prosecutes the target at termination of a single pass. A single pass method running a Barankin Estimator provides target height and variance for 3D target imaging that is suitable for war fighters, missiles, UAV, and other aerial platforms capable of nonlinear flight paths.

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06-03-2014 дата публикации

Method and apparatus for mapping and characterizing sea ice from airborne simultaneous dual frequency interferometric synthetic aperture radar (ifsar) measurements

Номер: US20140062764A1
Принадлежит: Fugro Earthdata Inc

X-band and P-band synthetic aperture radars are used to simultaneously gather swaths of reflected radar data over a specific area simultaneously. The P-band is used to penetrate surface clutter that may be on the top of an ice formation as well as to penetrate an ice mass. X-band is used to map surface clutter on the top of an ice formation as well as to map the top of snow that may appear on an ice formation. Digital elevation maps of the top of the snow or ice clutter, the top of the ice, and the bottom of the ice and or ice thickness are constructed. By summing these various digital elevation maps a measurement of the thickness of sea ice can be determined. Further analysis of DEM, MAG and CRV layers provides an indication of the quality of the ice, for example cracks and pressure ridges, and its weak points.

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20-03-2014 дата публикации

Compressive radar imaging technology

Номер: US20140077989A1
Принадлежит: UNIVERSITY OF MARYLAND AT COLLEGE PARK

A method, apparatus and computer-readable medium is provided that can utilize an undersampling method and can produce a radar image of a target. The radar image of the target can be based on a collection of waveform measurements, where the collection can be based on a significantly reduced number of transmitted and received electromagnetic pulse waveforms.

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02-01-2020 дата публикации

INNOVATIVE LOCATOR SYSTEM, RELATED LOW POWER CONSUMPTION REGENERATIVE TRANSPONDER AND RELATED LOCALIZATION METHOD AND SERVICE

Номер: US20200003894A1
Принадлежит:

The present invention concerns a localization method for locating a target that is coupled with a locator transponder associated with a permanent identification code permanently assigned to said locator transponder; the localization method comprising: upon reception of a user request for locating the target, transmitting, by a paging system or by a radar-based system, a spread spectrum paging signal carrying the permanent identification code and a temporary identification code temporarily assigned to the locator transponder, wherein said temporary identification code is shorter than said permanent identification code; receiving, by the locator transponder, the spread spectrum paging signal and extracting, by said locator transponder, the temporary identification code carried by said spread spectrum paging signal received; transmitting, by the radar-based system, radar signals towards one or more areas of earth's surface or sky, and receiving, by said radar-based system, echo signals from said one or more areas of the earth's surface or sky; upon reception by the locator transponder of one or more radar signals transmitted by the radar-based system, generating and transmitting, by said locator transponder, a sequence of watermarked radar echo signals in which a spread spectrum watermarking signal is embedded, wherein said spread spectrum watermarking signal carries the temporary identification code extracted. 155. Localization method for locating a target that is coupled with a locator transponder () associated with a permanent identification code permanently assigned to said locator transponder ();the localization method comprising:{'b': 3', '200', '4', '300', '500', '5, 'a) upon reception of a user request for locating the target, transmitting, by a paging system (,) or a radar-based system (,,), a spread spectrum paging signal carrying the permanent identification code and a temporary identification code temporarily assigned to the locator transponder (), wherein ...

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07-01-2021 дата публикации

Method and apparatus for generating non-linear frequency modulation signal in real time and computer storage medium

Номер: US20210003666A1
Принадлежит: Institute of Electronics of CAS

A method and apparatus for generating a NLFM signal in real time, and a computer storage medium are disclosed, including: determining a signal parameter of a signal according to a system parameter, the signal parameter includes: a signal bandwidth, a signal pulse width and a PSLR; determining a power spectrum density function according to PSLR; calculating the power spectrum density function to obtain a group delay vector; calculating a frequency axial vector according to a system sampling rate; calculating a time axial vector according to the signal pulse width; performing linear interpolation calculation on the group delay vector to obtain an instantaneous frequency vector; integrating the instantaneous frequency vector to obtain a phase vector; determining a signal time domain discrete vector; and generating a digital signal according to the signal time domain discrete vector, and performing digital-to-analog conversion on the digital signal to obtain the NLFM signal.

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12-01-2017 дата публикации

Terrestrial imaging using multi-polarization synthetic aperture radar

Номер: US20170010353A1
Принадлежит: ConocoPhillips Co

An embodiment of a method for processing synthetic aperture radar (SAR) image data includes acquiring a multi-polarization SAR image of a terrestrial region, pre-processing the SAR image to remove or reduce radiometric and geometric errors, and separating the SAR image into a plurality of channels, each channel representing an image associated with a different polarization mode. The method also includes calculating a characteristic of the region for each polarization channel, acquiring ground data and estimating the characteristic of the region based on the ground data, estimating a correlation of the calculated characteristic for each polarization channel with the estimated characteristic based on the ground data, selecting one or more polarization channels having a correlation exceeding a selected value, and generating a SAR image including only the selected polarization channels based on the comparison.

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11-01-2018 дата публикации

SYNTHETIC-APERTURE RADAR SIGNAL PROCESSING APPARATUS

Номер: US20180011187A1
Принадлежит: Mitsubishi Electric Corporation

A synthetic-aperture radar signal processing apparatus in accordance with the present invention estimates the height of a scatterer in a synthetic aperture radar image observed at sets of sensors, each corresponding to a baseline length, and extracts a pixel corresponding to the scatterer at the height from the synthetic aperture radar image. The synthetic-aperture radar signal processing apparatus generates a topographic fringe of the synthetic aperture radar image calculates the phase of the topographic fringe that correspond to the specific height, and then extracts a pixel having the phase from the topographic fringe, resulting in the extraction of the pixel at the specific height. This configuration can extract a specific height corresponding to a combination of the phases generated by multiple topographic fringes and measure the height of the scatterer where the two sensors having the shortest baseline determine a measurable height. 1. A synthetic-aperture radar signal processing apparatus comprising: a first topographic fringe represented by multiple pixels, representing a relative phase between signals contained in two pixels representing a same scatterer in a first set of two synthetic aperture radar images using the first set of two synthetic aperture radar images generated by two sensors having a first baseline length, and', 'a second topographic fringe represented by multiple pixels, representing a relative phase between signals contained in two pixels representing the same scatterer in a second set of two synthetic aperture radar images using the second set of two synthetic aperture radar images generated by two sensors having a second baseline length; and, 'an interference phase processor to calculate'} a phase calculator to calculate a first specific phase that corresponds to a scatterer at at least one specific height in the first topographic fringe and a second specific phase that corresponds to the scatterer at said at least one specific height in ...

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11-01-2018 дата публикации

SAR DATA SEARCH APPARATUS, METHOD, AND RECORDING MEDIUM

Номер: US20180011188A1
Автор: Oyama Hiroshi
Принадлежит: NEC Corporation

In order to enable to change a search condition of a set of SAR data, depending on a purpose of generating InSAR data, an SAR data search method according to an exemplary aspect of the invention includes: receiving an input of a search condition comprising a search purpose and an observation date/time condition, switching the observation date/time condition to be used as the search condition, depending on the search purpose, and extracting, from a metadata storage unit configured to store metadata comprising an observation date/time associated with identification information of an SAR data, the identification information of a set of the SAR data that satisfies the search condition, and outputting the extracted identification information of each piece of the SAR data in the set. 1. An SAR data search apparatus comprising:a condition input unit configured to receive an input of a search condition comprising a search purpose and an observation date/time condition;a search unit configured to switch the observation date/time condition to be used as the search condition, depending on the search purpose, and configured to extract, from a metadata storage unit configured to store metadata comprising an observation date/time associated with identification information of an SAR (synthetic aperture radar) data, the identification information of a set of the SAR data that satisfies the search condition; andan output unit configured to output the extracted identification information of each piece of the SAR data in the set.2. The SAR data search apparatus according to claim 1 , whereinthe search purpose comprises generating DSM (Digital Surface Model) data or/and generating DInSAR (Differential Interferometric SAR) data.3. The SAR data search apparatus according to claim 2 , wherein claim 2 ,when the search purpose is generating DSM data,the search unit extracts master data and slave data as the set, andthe observation date/time condition comprises a condition relating to the ...

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21-01-2016 дата публикации

RADAR IMAGING OF BOREHOLES

Номер: US20160017702A1
Принадлежит: BAKER HUGHES INCORPORATED

A method of estimating a characteristic of a formation includes: disposing a radar imaging tool in a borehole; generating a high frequency radar signal by a radar transmitter, the high frequency radar signal having a frequency configured to limit penetration of the radar signal to a near-borehole region of the formation, the near-borehole region including a surface of the borehole and a region of the borehole proximate to the surface; detecting return signals reflected from the near-borehole region; generating an image of the near-borehole region based on the return signals; and estimating a characteristic of the formation based on the image.

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17-01-2019 дата публикации

Method for Calibrating an Active Sensor System

Номер: US20190018105A1

The invention relates to a method for calibrating an active sensor system which comprises at least one active sensor A and one active sensor B. The term “active” indicates that the sensors A and B actively emit signals. The sensor A has a transmitter TXfor emitting a signal Sand a receiver RXfor receiving a signal S RXA, wherein the receiver RX A and the transmitter TXoperate independently of one another to the greatest possible extent in a radar mode of the sensor A. The sensor B has a transmitter TX, a receiver RX, and a unit D, which is used to connect the transmitter TXto the receiver RXin a transponder mode of the sensor B, with the result that a signal Sreceived by the receiver RXis emitted again by the transmitter TXas a signal S. A gain Gbetween the received signal Sand the signal Swhich is emitted again is predefined in this case. In a radar mode of the sensor B, the transmitter TXis not connected to the receiver RX, with the result that the transmitter TXand the receiver RXoperate independently of one another. The emitted signals may be, for example, radar signals, light signals, or acoustic signals. In this respect, the proposed method is suitable for calibrating radar systems, lidar systems or sonar systems, for example. 2. The method according to claim 1 , in which the wave length λ corresponds to a respective integral of all frequencies of a band-limited signal emitted by the respective transmitter i claim 1 , with iϵ{A claim 1 , B}.3. The method according to claim 1 , in which the transmitter TXis a digital-to-analog converter and a transmitting antenna claim 1 , the receiver RXis an analog-to-digital converter and a receiving antenna claim 1 , and the unit D is a unit for digital signal processing claim 1 , which in the transponder mode connects the transmitter TXwith the receiver RXfor the data communication.4. The method according to claim 1 , in which the sensor A and the sensor B are a RADAR sensor or a SONAR sensor or a LIDAR sensor.5. The ...

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22-01-2015 дата публикации

SYSTEMS, APPARATUS, AND METHODS FOR ACQUISITION AND USE OF IMAGE DATA

Номер: US20150025788A1
Принадлежит:

Systems and methods for mapping. In one version mapping can be carried out. Vehicles may carry scanners used for mapping and three-dimensional modeling. Surveillance and monitoring methods and apparatus are also disclosed. 1. A method of collecting image data for use in generating an image data database , the method comprising:providing an image data collection system on a vehicle equipped for ground travel;moving the vehicle along a path on the ground;while moving the vehicle, collecting image data along said path for generating said image data database;wherein collecting image data comprises collecting image data representative of a three-dimensional image.2. A method as set forth in wherein collecting image data comprises transmitting a radio wave and receiving a reflection radio wave.3. A method as set forth in wherein transmitting said radio wave comprises transmitting a radio wave including circular polarization.4. A method as set forth in wherein collecting image data comprises collecting photographic image data.5. A method as set forth in wherein collecting image data comprises correlating the radar-generated image data with the photographic image data.6. A method as set forth in further comprising time-stamping the collected image data.7. A method as set forth in further comprising geo-stamping the collected image data.8. A method as set forth in wherein collecting image data comprises collecting image data representative of material beneath a surface of a volume.925-. (canceled)26. A method as set forth in further comprising transmitting the collected image data to a location remote from the vehicle for use in generating the image database.2728-. (canceled)29. A method as set forth in wherein the vehicle is equipped for executing a task other than data collection and data image is collected while operating the vehicle in furtherance of said task other than data collection.30. A method as set forth in wherein said vehicle is a part of a fleet of vehicles ...

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24-01-2019 дата публикации

HIGH EFFICIENCY SYNTHETIC APERTURE RADAR SATELLITE

Номер: US20190025422A1
Принадлежит:

Systems and methods in accordance with various embodiments of the present disclosure provide high efficiency synthetic aperture radar satellite designs that achieve higher power efficiency and higher antenna aperture size to satellite mass ratios than the current state of the art. In various embodiments, a high efficiency synthetic aperture radar satellite includes a satellite bus and a parabolic reflector antenna coupled to the satellite bus. The satellite system may further include a traveling wave tube amplifier configured to drive the parabolic reflector antenna, and a body-mounted steering system configured to mechanically steer the satellite system to direct the parabolic reflector antenna. The satellite system may further include a processor configured to combine the pulse reflections and generate image data representing the region of interest, in which the image data is effectively obtained with a synthetic aperture greater than the actual antenna aperture. 1. A radar satellite system , comprising:a satellite bus;a parabolic reflector antenna coupled to the satellite bus, the parabolic reflector antenna comprising a central hub and a plurality of antenna ribs movable from a stowed position to an operational position, the antenna ribs foldable around the central hub in the stowed position and expandable into a parabolic reflector configuration in the operational position, wherein the antenna is configured to transmit a series of pulses from different positions over a region of interest and receive a corresponding series of pulse reflections;a traveling wave tube amplifier configured to drive the parabolic reflector antenna;a body-mounted steering system configured to mechanically steer the satellite system to direct the parabolic reflector antenna; anda processor configured to combine the pulse reflections and generate image data representing the region of interest, the image data associated with a synthetic aperture greater than the antenna aperture.2. The ...

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23-01-2020 дата публикации

Flying body and program

Номер: US20200025912A1
Принадлежит: Japan Aerospace Exploration Agency JAXA

A flying body includes an observation data generation unit that generates observation data on the basis of radio waves received by a radar, an image generation unit that generates an image representing a monitoring space on the basis of the observation data generated by the observation data generation unit, and a detection unit that detects a detection target on the basis of the image generated by the image generation unit.

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04-02-2016 дата публикации

METHOD AND APPARATUS FOR STACKING MULTI-TEMPORAL MAI INTERFEROGRAMS

Номер: US20160033639A1
Принадлежит:

An apparatus and method for stacking multi-temporal MAI interferograms Disclosed are disclosed herein. The apparatus includes a processor configured to: generate a forward-looking InSAR (Interferometric Synthetic Aperture Radar) interferogram and a backward-looking InSAR interferogram of multi-temporal interferometric pairs; generate a residual forward-looking interferogram and a residual backward-looking interferogram by removing low-frequency phase components from the forward-looking InSAR interferogram and the backward-looking InSAR interferogram; generate a stacked forward-looking interferogram and a stacked backward-looking interferogram by separately stacking the residual forward-looking interferogram and the residual backward-looking interferogram; and generate a stacked MAI interferogram based on a phase difference between the stacked forward-looking interferogram and the stacked backward-looking interferogram. 1. A method of stacking multi-temporal multiple aperture SAR interferometry (MAI) interferogram , comprising:generating, by a processor, a forward-looking InSAR (Interferometric Synthetic Aperture Radar) interferogram and a backward-looking InSAR interferogram of multi-temporal interferometric pairs;generating, by the processor, a residual forward-looking interferogram and a residual backward-looking interferogram by removing low-frequency phase components from the forward-looking InSAR interferogram and the backward-looking InSAR interferogram;generating, by the processor, a stacked forward-looking interferogram and a stacked backward-looking interferogram by separately stacking the residual forward-looking interferogram and the residual backward-looking interferogram; andgenerating, by the processor, a stacked MAI interferogram based on a phase difference between the stacked forward-looking interferogram and the stacked backward-looking interferogram.2. The method of claim 1 , further comprising correcting claim 1 , by the processor claim 1 , an ...

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04-02-2021 дата публикации

METHOD AND APPARATUS FOR PHASE UNWRAPPING OF SYNTHETIC APERTURE RADAR (SAR) INTERFEROGRAM BASED ON SAR OFFSET TRACKING SURFACE DISPLACEMENT MODEL

Номер: US20210033726A1

The present disclosure relates to a method and apparatus for phase unwrapping of an SAR interferogram based on an SAR offset tracking surface displacement model, in which the apparatus according to the present disclosure includes a Synthetic Aperture Radar (SAR) image acquisition unit that acquires two SAR images of a same object acquired at different times, a single look complex (SLC) image production unit that produces two SLC images corresponding to each of the two SAR images, an interferogram production unit that generates an SAR interferogram using SAR interferometry for the two SLC images, a surface displacement model production unit that produces an offset tracking surface displacement model using SAR offset tracking method for the two SLC images, an unwrapped residual interferogram generation unit that generates a residual interferogram by subtracting the SAR interferogram and the offset tracking surface displacement model, and generates an unwrapped residual interferogram by unwrapping the generated residual interferogram, and an unwrapped interferogram generation unit that generates an unwrapped SAR interferogram by adding the unwrapped residual interferogram to the offset tracking surface displacement model. 1. An apparatus comprising:a Synthetic Aperture Radar (SAR) image acquisition unit that acquires two SAR images of a same object acquired at different times;a single look complex (SLC) image production unit that produces two SLC images corresponding to each of the two SAR images;an interferogram production unit that generates an SAR interferogram using SAR interferometry for the two SLC images;a surface displacement model production unit that produces an offset tracking surface displacement model using SAR offset tracking method for the two SLC images;an unwrapped residual interferogram generation unit that generates a residual interferogram by subtracting the SAR interferogram and the offset tracking surface displacement model, and generates an ...

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12-02-2015 дата публикации

SAR Point Cloud Generation System

Номер: US20150042510A1
Принадлежит:

The SAR Point Cloud Generation System processes synthetic aperture radar (SAR) data acquired from multiple spatially separated SAR apertures in such a manner as to be able to calculate accurate three-dimensional positions of all of the scatterers within the imaged scene. No spatial averaging is applied thus preserving the high resolution of the original SAR data, and no phase unwrapping processes are required. The effects of height ambiguities are significantly reduced in the SAR Point Cloud Generation System. The SAR Point Cloud Generation System also self-filters against mixed-height pixels that can lead to incorrect height estimates. The system estimates scatterer height by a maximization of an Interferometric Response Function. 1. A signal processing method used with multi-aperture synthetic aperture radar data forming a sparse aperture comprising the steps of:a. collecting multiple aperture raw SAR phase history data with each collection representing an element of a sparse aperture;b. processing the raw phase history data and forming complex imagery based on the raw phase history data;c. generating 3D point cloud data from the complex imagery;d. repeating steps (a)-(c) for multiple geometries to generate multiple 3D point cloud data sets of overlapping areas; ande. combining the multiple 3D point cloud data sets.2. The method of wherein the collecting step 1a includes the step of spacing the SAR sparse aperture elements in a pseudo random manner to minimize the deleterious effects of height ambiguities.3. The method of wherein step 1a includes the step of performing near-repeat flight tracks of a SAR system acquired over time.4. The method of wherein step 1a includes the step of using a single platform with multiple SAR elements on board.5. The method of wherein fewer than all of the SAR elements are actively transmitting radar pulses.6. The method of where the spacing of the SAR elements is configured to reduce height ambiguities over a height range of ...

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18-02-2021 дата публикации

METHOD AND SYSTEM FOR PRECISELY POSITIONING COLLAPSED AREA OF HIGH SLOPE

Номер: US20210048523A1
Принадлежит:

The present disclosure provides a method and a system for precise location of a high slope collapse area. Firstly, the slope images in a long time series are obtained, the slope images in the long time series are composed into a two-dimensional slope deformation graph, and an area with the maximum deformation in the two-dimensional slope deformation graph is selected as a deformation area. Then, the deformation area is segmented by straight line, and the deformation region obtained by straight line segmentation is displayed in overlapping way in the slope images of long time series, and the region corresponding to the connecting line with the largest change range is selected as the monitoring line area from the overlapping image. Finally, the monitoring points are selected from the monitoring line area to determine the location of the high slope collapse area 1. A method for precise location of a high slope collapse area , wherein the precise location method comprises the following steps:obtaining slope images in a long time series by using a ground-based synthetic aperture radar;composing the slope images in the long time series into a two-dimensional slope deformation graph by using a false color location method;selecting an area with the maximum deformation in the two-dimensional slope deformation graph as a deformed area;conducting line partitioning on a deformed area in a slope image at the first time point in the slope images in the long time series, and setting multiple reference points on each straight line;conducting line partitioning on deformed areas in slope images in a long time series, comprising slope images in all time points after the first time point, of the slope images in the long time series through line connection based on the multiple reference points of each straight line, to obtain a corresponding connecting line of each straight line in a slope image in each time series that is after a first time series;displaying deformed areas, obtained ...

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15-02-2018 дата публикации

Radar video creation apparatus and method

Номер: US20180045825A1
Автор: Kei Suwa, Tomoya Yamaoka
Принадлежит: Mitsubishi Electric Corp

There are provided an azimuth Fourier transform unit that transforms a SAR image into components in a Doppler frequency band, a band cutting-out unit that cuts out sub-band components from the components in the Doppler frequency band, and an azimuth inverse Fourier transform unit that transforms the sub-band components into sub-images, respectively. An image reconstructing unit extracts, for each area irradiated with a beam, a pixel sequence corresponding to the irradiated area from each of the sub-images, and collects the plurality of extracted pixel sequences to construct images for video.

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08-05-2014 дата публикации

Three-dimensional holographical imaging

Номер: US20140125516A1
Принадлежит: University of Missouri System

A holographic imaging system including a transmission line coupled to an antenna at one end and to a signal source at another end. The antenna defines an aperture through which a signal generated by the signal source is transmitted incident to an object located remotely from the aperture and through which a signal reflected from the object is received by the antenna aperture. A standing wave probe phase-referenced to the antenna aperture samples the reflected signal. A detector connected to the standing wave probe receives the sampled reflected signal and provides an output signal that represents a real-valued signal proportional to an in-phase component of the reflected signal from the object. A processor executes an imaging algorithm for generating a multi-dimensional profile representative of the object based on the output signal from the detector.

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08-05-2014 дата публикации

METHOD AND A DEVICE FOR EXTENDING THE ILLUMINATION OF A TEST OBJECT

Номер: US20140125517A1
Принадлежит: Rohde & Schwarz GmbH & Co. KG

The present disclosure provides a method and a corresponding device for extending the illumination of an object under investigation. The object under investigation is illuminated with an electromagnetic microwave signal which is transmitted from a transmission antenna. The microwave signal reflected from the object under investigation is received by at least one reception antenna. An image of the object under investigation is reconstructed through synthetic focusing of the reflected microwave signal. At least one reflector element is arranged orientated towards the object under investigation and the microwave signals reflected from the reflector element and from the object under investigation are received in a reception antenna and used for the reconstruction of the image of the object under investigation in addition to the microwave rays from a transmission antenna which strike the object under investigation without reflection on the reflector element and are received by the reception antenna without reflection on the reflector element. 1. A method for extending the illumination of an object under investigation , comprising:illuminating the object under investigation with an electromagnetic microwave signal which is transmitted from at least one transmission antenna;receiving by at least one reception antenna the microwave signal reflected from the object under investigation; andreconstructing an image of the object under investigation from the reflected microwave signal in a purely computational manner by synthetic focusing,wherein at least one reflector element is arranged orientated towards the object under investigation, and the microwave signals reflected from the reflector element and from the object under investigation are received in every reception antenna and used for the reconstruction of the image of the object under investigation in addition to microwave rays from a transmission antenna which strike the object under investigation without reflection on ...

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16-02-2017 дата публикации

Method and System for Coding Signals using Distributed Coding and Non-Monotonic Quantization

Номер: US20170048537A1

A decoder includes a memory storing a map of a space of encoded values. The map includes a plurality of cells partitioning the space, such that each cell encloses a cluster of encoded values and quantizes the cluster of encoded values to a quantized encoded value. Each cell is identified by a label selected from a finite alphabet, such that multiple cells in the map are identified by the same label, and the cells are labeled such that a pair of cells identified by the same label does not share a common boarder. The decoder also includes a receiver to receive from an encoder a label of a cell enclosing an encoded value on the map of the space and a processor to estimate the encoded value using side information to produce an estimation of the encoded value, to select a cell identified by the received label on the map of the multi-dimensional space that is the closest to the estimation of encoded value, and to determine the encoded value as the quantized encoded value of the selected cell. 1. A decoder , comprising:a memory storing a map of a space of encoded values, wherein the map includes a plurality of cells partitioning the space, such that each cell encloses a cluster of encoded values and quantizes the cluster of encoded values to a quantized encoded value, wherein each cell is identified by a label selected from a finite alphabet, such that multiple cells in the map are identified by the same label, and wherein the cells are labeled such that a pair of cells identified by the same label does not share a common boarder;a receiver to receive from an encoder a label of a cell enclosing an encoded value on the map of the multi-dimensional space; anda processor to estimate the encoded value using side information to produce an estimation of the encoded value, to select a cell identified by the received label on the map of the space that is the closest to the estimation of encoded value, and to determine the encoded value as the quantized encoded value of the ...

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03-03-2022 дата публикации

Synthetic aperture radar imaging apparatus and methods

Номер: US20220066024A1
Автор: Peter Allen Fox
Принадлежит: Spacealpha Insights Corp

A synthetic aperture radar (SAR) is operable in an interrogation mode and in a self-imaging mode, the self-imaging mode entered in response to determining a response to interrogation pulses have been received from a ground terminal and position information specifying a ground location has been received from the ground terminal. A ground terminal is operable to receive interrogation pulses transmitted by a SAR, transmit responses, and transmit position information to cause the SAR to enter a self-imaging mode. The ground terminal receives first and subsequent pulses from the SAR where subsequent pulses include backscatter and are encoded. The ground terminal generates a range line by range compression.

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26-02-2015 дата публикации

RADAR SYSTEM AND DATA PROCESSING DEVICE

Номер: US20150054678A1
Автор: Wakayama Toshio
Принадлежит: Mitsubishi Electric Corporation

An observation device includes a transmitter and receiver (a transmitter , a transmission/reception switch , an antenna , and a receiver ) that emits a predetermined radar wave to outside the observation device, and that receives the radar wave scattered by an object existing outside the observation device and acquires a received signal, a temporary image generator that generates a temporary image from the received signal acquired by the transmitter and receiver, and a data transmitter that transmits the temporary image generated by the temporary image generator to a data processing device . The data processing device includes a data receiver that receives the temporary image transmitted by the data transmitter , and an image generator that generates an image from both the temporary image received by the data receiver and orbit data about a moving object. 1. A radar system including an observation device that is mounted in a moving object and observes an object , and a data processing device that processes data from said observation device , whereinsaid observation device comprises:a transmitter and receiver that emits a predetermined radar wave to outside said radar system, and that receives said radar wave scattered by an object existing outside said radar system and acquires a received signal;a temporary image generator that temporarily carries out an azimuth compression process on the received signal acquired by said transmitter and receiver by using temporary orbit data to generate a temporary image; anda data transmitter that transmits the temporary image generated by said temporary image generator, andsaid data processing device comprises:a data receiver that receives the temporary image transmitted by said data transmitter; andan image generator that carries out an azimuth compression process on the temporary image received by said data receiver by using orbit data having a higher degree of accuracy than said temporary orbit data to generate an image.24-. ( ...

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26-02-2015 дата публикации

METHOD AND DEVICE FOR DETECTING STRUCTURES IN AN OBJECT UNDER INVESTIGATION

Номер: US20150054679A1
Автор: Ahmed Sherif Sayed
Принадлежит: ROHDE & SCHWARZ GMBH & CO.KG

A method for detecting structures () such as edges and material transitions on and/or in an object () under investigation has an antenna arrangement which transmits microwave signals and registers the signals reflected from the object () under investigation in magnitude and phase. A three-dimensional image of the object () under investigation is reconstructed at sampling points of the object under investigation from the latter. It operates with the method steps: 1. A method for detecting structures , especially edges and material transitions on and/or in an object under investigation , comprising ,providing an antenna arrangement from which microwave signals are transmitted and from which the signals reflected from the object under investigation are registered in magnitude and phase, wherein a three-dimensional image of the object under investigation is reconstructed from these,determining a spatial position of a structure from the magnitude of the reflected signal,determining the sign of the reflection coefficient of the reflected signal at the spatial position of the structure, andidentifying structures on the basis of the spatial arrangement of the sign of the reflection coefficient.2. The method according to claim 1 ,wherein the precise spatial position of the structure is determined by preparing an image in the region of the originally determined spatial position with a narrower grid of sampling points.3. The method according to claim 1 ,wherein the precise spatial position of the structure is determined by interpolation of the signal magnitude between sampling points in the region of the originally determined spatial position.4. The method according to claim 1 ,wherein the sign of the reflection coefficient is determined from the phase behavior of the reflected signal, andwherein a negative sign of the reflection coefficient is present if a sudden phase change is determined in the reflected signal, and a positive sign of the reflection coefficient is present ...

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22-02-2018 дата публикации

SYSTEM FOR DETECTING MAN-MADE OBJECTS USING POLARIMETRIC SYNTHETIC APERTURE RADAR IMAGERY WITH ERROR REDUCTION AND METHOD OF USE

Номер: US20180052229A1

A system for determining the location of a man-made object based upon symmetry of the object comprising a receiver configured to receive radar signals comprising cross-polarized and co-polarized responses; at least one processor configured to combine the horizontal-horizontal polarimetric responses and vertical-vertical polarimetric responses to form co-polarimetric images and operate on one or both of the vertical-horizontal polarimetric responses and horizontal-vertical polarimetric responses to form cross-polarized images; the at least one processor configured to process the co-polarized and cross-polarized images to locate areas of interest containing a maximum in the co-pol image and a null state in the co-pol image indicating the potential detection of a man-made object; the at least one processor being configured to filter data using buffer regions and/or skipping of pixels in the vicinity of an area of interest. A method for detection of man-made objects is also disclosed. 1. A system for determining the location of a man-made object based upon symmetry of the object comprising:a receiver configured to receive radar signals comprising cross-polarized and co-polarized responses, the co-polarized responses measured either by transmitting and receiving both horizontally polarized waves (horizontal-horizontal) or by transmitting and receiving both vertically polarized waves (vertical-vertical); the cross-polarized responses measured by either transmitting horizontally polarized waves and receiving vertically polarized waves (horizontal-vertical) or by transmitting vertically polarized waves and receiving horizontally polarized waves (vertical-horizontal);at least one processor, the at least one processor configured to process horizontal-horizontal co-polarimetric (co-pol) data, vertical-vertical co-polarimetric data, and one or both of the vertical-horizontal cross-polarimetric data and horizontal-vertical polarimetric data to form co-polarized images and cross- ...

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03-03-2016 дата публикации

Synthetic Aperture Imaging Methods And Systems

Номер: US20160061950A1
Принадлежит:

The invention generally relates to the field of synthetic aperture imaging. In particular, the invention relates to systems and methods for generating synthetic transmit aperture (“STA”) signals and processing synthetic aperture imaging (“SAI”) signals for improved signal-to-noise ratio (“SNR”) and spatial resolution. This generally relates to a method to improve the signal-noise-ratio (SNR) of array signals by both encoding the transmission from multiple array elements with waveform modifications and time delays and encoding the receivers into output channels and decoding the measured signals at the selected output channels to estimate the equivalent received signals of a receiver as if only one transmitting element were fired individually in each transmission event. SAI techniques are subsequently applied to the equivalent SAI signals to obtain improved images. 1. A system for generating and acquiring image data signals and processing acquired data signals for reconstructing image data , said system comprising:a plurality of transmitting elements for emitting image detection pulse waves;a plurality of receiving elements;a central control processor, the central control processor controlling transmission process according to a transmission scheme and controlling receiving process according to a receiving scheme, the transmission scheme specifying transmitters of the plurality of transmitting elements that transmit during a transmission event and a waveform modification and a time delay assigned to each of the transmitting elements specified in the transmission scheme, the receiver scheme specifying receivers of the plurality of receiving elements that receive and measure signal data at each of the specified receivers,a plurality of receiving electronics units for connection with the receiving elements to process signal data measured by the receiving elements;a transmitter multiplexer for connecting transmitting elements specified in the transmission scheme with a ...

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01-03-2018 дата публикации

System and Method for Radar Imaging Using Distributed Moving Platforms Under Unknown Position Perturbations

Номер: US20180059237A1
Принадлежит:

Systems and methods for fusing a radar image in response to radar pulses transmitted to a region of interest (ROI). The method including receiving a set of reflections from a target located in the ROI. Each reflection is recorded by a receiver at a corresponding time and at a corresponding coarse location. Aligning the set of reflections on a time scale using the corresponding coarse locations of the set of distributed receivers to produce a time projection of the set of reflections for the target. Fitting a line into data points formed from radar pulses in the set of reflections. Determining a distance between the fitted line and each data point. Adjusting the coarse position of the set of distributed receivers using the corresponding distance between the fitted line and each data point. Fusing the radar image using the set of reflections received at the adjusted coarse position. 1. A method for fusing a radar image in response to radar pulses transmitted to a region of interest (ROI) , a transmitter transmits the radar pulses toward the ROI and a set of distributed receivers to receive a set of reflections from the ROI , the method comprising:receiving the set of reflections from at least one target located in the ROI, each reflection is recorded by a receiver from the set of distributed receivers at a corresponding time and at a corresponding coarse location;aligning the set of reflections on a time scale using the corresponding coarse locations of the set of distributed receivers to produce a time projection of the set of reflections for the at least one target;fitting a line into data points formed from radar pulses in the set of reflections received from the set of distributed receivers;determining a distance between the fitted line and each data point;adjusting the coarse position of the set of distributed receivers using the corresponding distance between the fitted line and each data point; andfusing the radar image using the set of reflections received at ...

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01-03-2018 дата публикации

MULTILOOK COHERENT CHANGE DETECTION

Номер: US20180059238A1
Принадлежит: THALES HOLDINGS UK PLC

Methods and devices use information from the original SAR images to provide measurements that can be applied to corresponding change detection products. This produces reliable registration and alignment for the change products even when the imaging geometry is significantly changed. A method of processing synthetic aperture radar, SAR, image data comprising a plurality of frames of SAR image data for each of a plurality of image geometries; for each image geometry, applying change detection to the frames of SAR image data corresponding to that image geometry to produce a corresponding plurality of change products; selecting a plurality of said acquired frames as reference frames, one in respect of each image geometry; applying a multilook SAR process to the reference frames to produce a multilook SAR product, the multilook SAR process comprising at least one processing stage comprising measuring a property of the data contained in the reference frames and applying a transformation to the data governed by the measured property; and applying a multilook change process to the change products, the multilook change process comprising applying the same transformation as in the multilook SAR process, to the change products, to produce a multilook change product. 1. A method of processing synthetic aperture radar , SAR , image data comprising a plurality of frames of SAR image data for each of a plurality of image geometries;for each image geometry, applying change detection to the frames of SAR image data corresponding to that image geometry to produce a corresponding plurality of change products;selecting a plurality of said acquired frames as reference frames, one in respect of each image geometry;applying a multilook SAR process to the reference frames to produce a multilook SAR product, the multilook SAR process comprising at least one processing stage comprising measuring a property of the data contained in the reference frames and applying a transformation to the ...

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03-03-2016 дата публикации

Coded Imaging and Multi-User Communications Systems

Номер: US20160065323A1
Автор: ZEMP Roger
Принадлежит:

A coded imaging and multi-user communications systems using novel codes, algorithms to develop such codes, and technological implementations to use the codes for various types of systems involving multiple (or single) transmitters and multiple (or single) receivers of signals (which could include but are not limited to electromagnetic radiation, acoustic waves, other types of waves or data) as a function of time- or-space. 1. A system comprising a multiplicity of transmitters and receivers , the transmitters comprising transmitting elements and processing parts , the processing parts adapted to cause the transmitting elements to transmit a code taken from a set of codes , the set of codes being a set of sparse-repeating interval (SRI) codes , non-repeating interval (NRI) codes or Hadamard NRI codes.2. The system of in which the set of codes is the result of following the method comprising: selecting a sequence of intervals by a method comprising: A) Providing a seed sequence of intervals; B) finding a new interval that satisfies the properties of: i) the new interval and the sum of the new interval with the sum of the intervals from each point in the sequence to the end of the sequence are not existing intervals in the sequence ii) the new interval and the sum of the new interval with the sum of the intervals from each point in the sequence to the end of the sequence are not equal to any sum of the intervals from the beginning of the sequence up to any point in the sequence; iii) the new interval and the sum of the new interval with the sum of the intervals from each point in the sequence to the end of the sequence is not equal to any sum of the intervals from any point in the sequence to the end of the sequence; C) appending the new interval to the sequence of intervals; D) repeating steps B and C until the sequence of intervals has a desired length; and generating each code of the set of codes by creating a respective vector of non-zero numbers separated by zeros ...

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28-02-2019 дата публикации

SYSTEM AND METHOD FOR TRANSMITTING INFORMATION FROM SYNTHETIC APERTURE RADAR SATELLITE TO CLIENT RECEIVER

Номер: US20190064318A1
Автор: Laurila Pekka
Принадлежит:

A system and a method for transmitting information from a synthetic aperture radar satellite to a client receiver. In one aspect, the synthetic aperture radar satellite includes a processing unit configured to form information from a previously measured synthetic aperture radar raw data stored in a data storage; a modulator configured to modulate the information to a synthetic aperture radar transmission signal; a transmitter for transmitting the modulated synthetic aperture radar transmission signal. The processing unit is configured to suppress the modulation from a received echo signal of the modulated synthetic aperture radar transmission signal to form and store a synthetic aperture radar raw data in the data storage. The client receiver includes an antenna for receiving the transmitted modulated synthetic aperture radar transmission signal; and a demodulator configured to demodulate the received transmitted modulated synthetic aperture radar transmission signal to obtain the information. 1. A method for transmitting information from a synthetic aperture radar satellite to a client receiver , the method comprising steps of:using a previously stored synthetic aperture radar raw data from a data storage to form the information;modulating a synthetic aperture radar transmission signal to carry the information;transmitting the modulated synthetic aperture radar transmission signal from the synthetic aperture radar satellite;receiving the modulated synthetic aperture radar transmission signal with the client receiver and demodulating the modulated synthetic aperture radar transmission to obtain the information; and processing the received echo signal of the modulated synthetic aperture radar transmission signal for suppressing the modulation;', 'forming a synthetic aperture radar raw data from the processed echo signal; and', 'storing the synthetic aperture radar raw data in the data storage for further use., 'receiving an echo signal of the modulated synthetic ...

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11-03-2021 дата публикации

SYNTHETIC APERTURE RADAR SIGNAL PROCESSING DEVICE AND METHOD

Номер: US20210072376A1
Принадлежит: NEC Corporation

A synthetic aperture radar signal processing device includes a persistent scatterer extraction unit which extracts, from time-series observation data related to an observation target observed from a plurality of observation directions by a radar, a plurality of persistent scatterers in respective observation directions; a persistent scatterer grouping unit which groups the plurality of persistent scatterers in each of the observation directions; a group selection unit which selects, in each of the observation directions, a persistent scatterer group that includes the persistent scatterers included in an analysis target from among groups generated by grouping; and a displacement speed processing unit which synthesize displacement speeds of the selected persistent scatterer groups. 1. A synthetic aperture radar signal processing device , comprising:a persistent scatterer extraction unit configured to extract, from time-series observation data related to an observation target observed from a plurality of observation directions by a radar, a plurality of persistent scatterers in respective observation directions;a persistent scatterer grouping unit configured to group the plurality of persistent scatterers in each of the observation directions;a group selection unit configured to select, in each of the observation directions, a persistent scatterer group that includes the persistent scatterers included in an analysis target from among groups generated by grouping; anda displacement speed processing unit configured to synthesize displacement speeds of the selected persistent scatterer groups.2. The synthetic aperture radar signal processing device according to claim 1 , wherein the displacement speed processing unit includesa displacement speed calculation unit configured to calculate a displacement speed of the persistent scatterer group selected in each of the observation directions, anda displacement speed synthesis unit configured to synthesize the displacement ...

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15-03-2018 дата публикации

Radar System

Номер: US20180074185A1
Принадлежит: SRC, INC.

A radar system includes an image forming circuit that provides a two-dimensional image of an operating environment. The image includes pixel elements representative of the operating environment. The system includes at least one filter configured to convert the two-dimensional image into a clutter classification map of clutter regions. A predetermined number of clutter regions are selected as training cells for a predetermined cell-under-test (CUT). A space-time adaptive processor (STAP) is configured to derive a weighted filter from training cell data. The STAP applies the weighted filter to a digital return signal associated with the predetermined CUT to provide a STAP-filtered digital return signal having the clutter signal components substantially eliminated therefrom. 1. A radar system comprising:an RF assembly configured to convert incident RF signals reflected from an operating environment into a plurality of digital signals, the plurality of digital signals including at least clutter signal components;an image forming circuit coupled to the RF assembly, the image forming circuit being configured to provide a two-dimensional image of the operating environment based on the plurality of digital signals, the two-dimensional image including a plurality of pixel elements representative of the operating environment;at least one filter coupled to the image forming circuit, at least one filter being configured to convert the two-dimensional image into a clutter classification map comprising a plurality of clutter regions, the at least one filter being further configured to select a predetermined number of clutter regions from the plurality of clutter regions for use as training cells for a predetermined cell-under-test (CUT); anda space-time adaptive processor (STAP) coupled to the at least one filter, the STAP being configured to derive a weighted filter from the digital signals corresponding to the training cells, the STAP being further configured to apply the ...

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12-06-2014 дата публикации

METHOD AND SYSTEM USING COORDINATED AIRBORNE AND GROUND PLATFORMS FOR DETECTING OIL COVERED BY ICE

Номер: US20140159936A1
Принадлежит: HARRIS CORPORATION

A method for detecting an oil mass covered by ice includes collecting alert data at a first probability of detection using an airborne platform moved about a search area above the ice. An alert area having a likelihood of an oil mass covered by the ice is determined based upon the alert data. Confirmation data is collected at a second probability of detection higher than the first probability of detection using a ground platform moved over the alert area. An oil mass covered by the ice is detected based upon the confirmation data. 1. A method for detecting an oil mass covered by ice comprising:collecting alert data at a first probability of detection using at least one airborne platform moved about a search area above the ice;determining an alert area having a likelihood of an oil mass covered by the ice based upon the alert data;collecting confirmation data at a second probability of detection higher than the first probability of detection using a ground platform moved over the alert area; anddetecting an oil mass covered by the ice based upon the confirmation data.2. The method according to wherein collecting the alert data comprises using at least one unmanned airborne platform.3. The method according to wherein collecting the confirmation data comprises using at least one unmanned ground platform.4. The method according to wherein collecting the alert data comprises using at least one unmanned airborne platform; wherein collecting the confirmation data comprises using at least one unmanned ground platform; and further comprising remotely controlling the unmanned airborne platform and unmanned ground platform from a remote control station.5. The method according to wherein collecting the alert data comprises collecting synthetic-aperture radar data.6. The method according to wherein collecting the alert data comprises collecting circular polarization diversity synthetic-aperture radar data.7. The method according to wherein collecting the confirmation data ...

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22-03-2018 дата публикации

GROUND-BASED, MULTI-BISTATIC INTERFEROMETRIC RADAR SYSTEM FOR MEASURING 2D AND 3D DEFORMATIONS

Номер: US20180081051A1
Принадлежит: IDS GEORADAR S.r.l.

The invention relates to a method and to an apparatus for determining a displacement vector field of a scenario, by a ground-based interferometric radar system operated in multi-bistatic mode and comprising a main radar transceiver device and at least one passive radar receiver device arranged at a predetermined distance from each other, in which the oscillators of the at least two radar are synchronized, in time and in frequency, in particular according to a signal coming from a global positioning system. The method provides a step of interferometrically determining at least one first displacement map and one second displacement map of the scenario between a previous time and a subsequent time, expressed in a global reference system and having each a plurality of pixels each associated to a respective domain of the scenario. The first and the second displacement maps comprise first and second displacement components of the pixel, respectively, along the line of sight of the main radar device, and along the bisectors of an angle between said line of sight and the line of sight of passive radar device, for each pixel. A step is then provided of combining the two displacement maps, more in detail, the first and the second component of each pixel, creating a displacement vector field of displacements occurred between the previous time and the subsequent time. The invention provides an apparatus much easier and less expensive than the prior art, in which a plurality of multi-monostatic, transceiving radar devices are used. 1. A method for determining a displacement vector field of a deformable scenario , comprising the steps of:prearranging a main radar device having a transmission unit and a reception unit for receiving from a first field of sight; said main radar device and said or each passive radar device having respective oscillators associated to said reception unit and to said transmission unit;', 'said main radar device and said or each passive radar device ...

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19-06-2014 дата публикации

METHOD FOR DISPLAYING AN ACTIVE RADAR IMAGE AND HANDHELD SCREENING DEVICE

Номер: US20140168008A1
Принадлежит: SONY CORPORATION

A method for displaying an active radar image of an object on a handheld screening device is provided comprising taking a sequence of active radar images of an object, the different active radar images of the sequence being representative for different distances of the object from the handheld screening device; selecting an image of the sequence of active radar images; and displaying the selected image on a display. A corresponding handheld screening device is provided as well. 1. Method for displaying an active radar image of an object on a handheld screening device , comprising:taking a sequence of active radar images of an object, the different active radar images of the sequence being representative for different distances of the object from the handheld screening device;selecting an image of the sequence of active radar images;displaying the selected image on a display.2. Method according to claim 1 , further comprising:generating selection criteria; andusing the selection criteria when selecting the image of the sequence.3. Method according to claim 2 , wherein the selection criteria are generated based on a user input.4. Method according to claim 2 , wherein the selection criteria are based on predetermined criteria.5. Method according to claim 2 , wherein the selection criteria are generated to select the image with the highest reflectivity of the object.6. Method according to claim 2 , wherein the selection criteria are generated to select the image closest to the handheld screening device that includes signals above a predetermined threshold.7. Method according to further comprising:displaying images of the sequence that are adjacent to the selected image in an order according to an order of the sequence.8. Method according to I further comprising:evaluating a distance of the object to the handheld screening device based on the radar image;generating a warning indication if the distance is below a predetermined threshold.9. Handheld screening device ...

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14-04-2016 дата публикации

USING FREQUENCY DIVERSITY TO DETECT OBJECTS

Номер: US20160103216A1
Принадлежит: The Boeing Company

Technologies for detecting a passive object through the use of frequency diversity to find at least a resonant peak are disclosed. For example, a radar system may illuminate a suspect area with a pulsed radio wave based on a large number of frequency bands and based on parameters associated with the passive object. The reflected radio wave may be processed to generate synthetic aperture radar (SAR) maps associated with the frequency bands. The SAR maps may be analyzed and compared to determine large deviation amplitudes that may indicate a location of the passive object. 1. A detection system comprising:radar transmitter circuitry configured to transmit a first signal representative of a plurality of frequency bands, each frequency band being at an interval from another frequency band based on a range resolution, the plurality of frequency bands forming a bandwidth that causes a variation of a scatterer in a radar map;radar receiver circuitry configured to generate a plurality of synthetic aperture radar maps based on a second signal representative of a reflection of the first signal, each synthetic aperture radar map of the plurality of synthetic aperture radar maps being associated with a frequency band from the plurality of frequency bands; andsignal processing circuitry configured to detect a target object based on a first synthetic aperture radar map representative of the plurality of synthetic aperture radar maps and a contribution of a second synthetic aperture radar map of the plurality of radar maps to the first synthetic aperture radar map.2. The detection system of claim 1 , wherein the range resolution is determined based on a dimension of the target object claim 1 , wherein the interval between two frequency bands is a reciprocal of the range resolution time interval claim 1 , wherein the plurality of frequency bands comprises at least twenty frequency bands claim 1 , wherein the plurality of frequency bands covers a major fraction of an octave of ...

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12-04-2018 дата публикации

FFT-Based Displaced Phase Center Array/Along-Track Interferometry Architecture

Номер: US20180100920A1
Автор: JR. Daniel D., Thomas
Принадлежит: SRC, INC.

A radar architecture comprising a computing device having a DC subtraction module, programmed to average a first value of a first pixel from a first received SAR image and a second value of a second pixel from a second received SAR image, to produce an averaged value, and to subtract the averaged value from the first value, resulting in a first DC subtracted pixel value, and to subtract the averaged value from the second value, resulting in a second DC subtracted pixel value; a DFT processing module programmed to receive the first DC subtracted pixel value and the second DC subtracted pixel value and to output a first DFT output comprising a plurality Doppler bins; and a detector module programmed to determine if the output of the DFT represents the presence of a target, and to estimate range-rate via a lookup table. 1. A method for detecting the motion of a moving target , comprising:receiving a first SAR image having at least a first pixel comprising a first value;receiving a second SAR image, the second SAR image being spatially aligned with the first SAR image and having at least a second pixel comprising a second value, the second SAR image having been formed after the first SAR image;inputting the first value and second value to a clutter cancelation processing module, and receiving from the clutter cancelation processing a first clutter canceled pixel value and a second clutter canceled pixel value;inputting the first clutter canceled pixel value and the second clutter canceled pixel value into an DFT processing module; andreceiving from the DFT processing module a first DFT output comprising a plurality of Doppler bins.2. The method of claim 1 , wherein the clutter cancellation module performs the steps of:averaging the first value and second value to produce an averaged value; andsubtracting the averaged value from the first pixel value and the second pixel value to produce the first clutter canceled pixel value and the second clutter canceled pixel value.3 ...

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26-03-2020 дата публикации

IMAGE ANALYSIS DEVICE, IMAGE ANALYSIS METHOD, AND COMPUTER-READABLE RECORDING MEDIUM

Номер: US20200096628A1
Принадлежит: NEC Corporation

An image analysis device that ease association between an SAR image and an object is provided. The image analysis device includes: a stable reflection point identification unit that identifies, based on a plurality of synthetic aperture radar (SAR) images, stable reflection points at which reflection is stable in the plurality of SAR images; a phase identification unit that identifies a phase at each of the stable reflection points, based on the plurality of SAR images and a location of the stable reflection point in the plurality of SAR images; and a clustering means that clusters the stable reflection points, based on a Euclidian distance between each of the stable reflection points and a correlation of the phases at each of the stable reflection points. 1. An image analysis device comprising:stable reflection point identification unit configured to identify, based on a plurality of synthetic aperture radar (SAR) images, stable reflection points at which reflection is stable in the plurality of SAR images; andclustering unit configured to cluster each of the stable reflection points, using each of Euclidian distances between the stable reflection points and each of correlations of phases of the stable reflection points.2. The image analysis device according to claim 1 , whereinthe clustering unit clusters each of the stable reflection points, based on each distance determined by using an Euclidian distance between two stable reflection points and a correlation of the phase of the two stable reflection points.3. The image analysis device according to claim 2 , whereinthe clustering unit clusters each of the stable reflection points by separating, based on the distance, each of the stable reflection points connected to one another.4. The image analysis device according to claim 3 , whereinthe clustering unit includes:distance identification unit configured to identify the distance, using the Euclidian distance and the correlation of the phases;minimum spanning tree ...

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26-03-2020 дата публикации

Synthetic aperture radar imaging apparatus and methods for moving targets

Номер: US20200096630A1

A synthetic aperture radar (SAR) system may employ SAR imaging to advantageously estimate or monitor a transit characteristic (e.g., velocity, acceleration) of a vehicle, for example a ground based vehicle or water based vehicle. A dual-beam SAR antenna illuminate a moving target with a first radar beam and a second radar beam at an angular offset relative to the first radar beam. Pulses may be transmitted and backscattered energy received simultaneously by the SAR transceiver via the first and second radar beams. A SAR data processor may generate a first image from the first radar beam and a second image from the second radar beam, co-registering the first and second images, comparing the location of the moving target in the first and second images, and estimate a velocity of the moving target based at least in part on the angular offset.

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08-04-2021 дата публикации

TRANSPOSITION OF A MEASUREMENT OF A RADAR CROSS-SECTION FROM AN RF-DOMAIN TO AN OPTICAL DOMAIN WITH PHASE RETRIEVAL

Номер: US20210103049A1
Принадлежит:

Optical modality configured to simulate measurements of the radar cross-section of targets, dimensioned to be conventionally-measured in the RF-portion of the electromagnetic spectrum, with sub-micron accuracy. A corresponding compact optical system, with a foot-print comparable with a tabletop, employing optical interferometric time-of-flight approach to reproduce, on a substantially shorter time-scale, radar-ranging measurements ordinarily pertaining to the range of frequencies that are at least 10times lower than those employed in the conventional RF-based measurement. 1. A method for measuring a characteristic , which an object possesses at a first frequency from a radiofrequency (RF) portion of electromagnetic (EM) spectrum , wherein the object is made of a first set of materials , the method comprising:{'sup': 3', '6, 'claim-text': wherein a chosen EM property of a material from the first set has a first value at the first frequency from the RF-portion of the EM spectrum,', 'wherein the chosen EM property of a respectively-corresponding material from the second set of materials has a second value at a second frequency,', 'wherein the second frequency is substantially equal to the first frequency multiplied by said scaled-reduction factor N,', 'and', 'wherein the first value and the second value are substantially equal,, 'from a second set of second materials, fabricating a scaled-down model of the object with a scale-reduction factor N in a range from about 10to about 10,'}irradiating said scaled-down model along an axis with chosen radiation that has a frequency spectrum including the second frequency;forming a tangible representation of a dependence of a value, of a RF radar cross-section (RCS) of the object at the first frequency, on a parameter representing spatial orientation of said object by acquiring, with a radiation detector, the chosen radiation that has been scattered by the scaled-down model; andproducing a tangible representation of topology of ...

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30-04-2015 дата публикации

SIGNAL PROCESSING DEVICE AND RADAR APPARATUS

Номер: US20150116143A1
Автор: NISHIYAMA Koji
Принадлежит:

A signal processing device is provided. The signal processing device processes reception signals received by an object detector that detects existence of objects. The signal processing device includes a coordinate detecting module configured to detect a plurality of sets of representative coordinates of each of two echo images at two or more timings, the two echo images obtained from the reception signals and caused by two target objects. The signal processing device also includes a determining module configured to determine, based on the plurality of sets of representative coordinates at the two or more timings, whether the two echo images are obtained from towing object signals caused by a pair of a towing object and a towed object. 1. A signal processing device configured to process reception signals received by an object detector that detects existence of objects , comprising:a coordinate detecting module configured to detect a plurality of sets of representative coordinates of each of two echo images at two or more timings, the two echo images obtained from the reception signals and caused by two target objects; anda determining module configured to determine, based on the plurality of sets of representative coordinates at the two or more timings, whether the two echo images are obtained from towing object signals caused by a pair of a towing object and a towed object.2. The signal processing device of claim 1 , further comprising a calculating module configured to calculate a moving distance and a moving direction of each of the echo images per predetermined period of time claim 1 , based on the plurality of sets of representative coordinates at the two or more timings claim 1 ,wherein the determining module determines that the two echo images are obtained from the towing object signals when a first condition and at least one of second and third conditions are satisfied,wherein the first condition is that a difference between the moving distance of one of the ...

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10-07-2014 дата публикации

METHOD AND APPARATUS FOR SIMULTANEOUS MULTI-MODE PROCESSING PERFORMING TARGET DETECTION AND TRACKING USING ALONG TRACK INTERFEROMETRY (ATI) AND SPACE-TIME ADAPTIVE PROCESSING (STAP)

Номер: US20140191900A1
Принадлежит:

The present invention discloses one or more methods to perform multimode processing using a single set of measured data in a multi-sensor fusion framework. In this context, various data processing methodologies are combined in parallel in a suitable manner to simultaneously image, detect, identify and track moving targets over clutter such as stationary background using data obtained from a single set of measurements. Traditionally multiple sets of data would be required to perform these tasks, furthermore the disparate datum would be processed independently of one another. By using a common data source and interconnected processors the information content of the measured data can be fully exploited and leveraged to provide actionable intelligence and aid logistics. 1. A method comprisingtransmitting a signal in the form of pulses from a moving platform towards a plurality of targets during a duration;receiving at a first receiver device a first set of pulse returns back from the plurality of targets in response to the signal, wherein the first receiver device is fixed to the moving platform;receiving at a second receiver device a second set of pulse returns back from the plurality of targets in response to the signal, wherein the second receiver device is fixed to the moving platform;determining a first subset of the first set of pulse returns;determining a first subset of the second set of pulse returns;determining a second subset of the first set of pulse returns;determining a second subset of the second set of pulse returns;subjecting the second subset of the first set of pulse returns to a synthetic aperture radar imaging process to form a first set of a first modified plurality of data items;subjecting the second subset of the second set of pulse returns to a synthetic aperture radar imaging process to form a second set of a first modified plurality of data items;subjecting the combination of the first set and second set of the first modified plurality of data ...

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28-04-2016 дата публикации

Radar imaging via spatial spectrum measurement and MIMO waveforms

Номер: US20160116582A1
Автор: Chang Donald C.D.
Принадлежит:

The proposed MIMO radar imaging method takes advantages of measurement techniques of spatial frequency components of an RF area image from radar returns. To minimize size, weight and power (SW&P), minimum redundancy arrays (MRAs) for both Tx and Rx with unique geometries are proposed. MIMO waveforms are utilized to index the radiated illuminations to a targeted area in the forms of 1-D spatial frequency components. Consequently, the corresponding radar returns from the targeted field of view (FOV) are captured by the Rx MRA. With the knowledge of uniquely designed MRA array geometries, virtual beams are synthesized in Rx processor; usually one Tx and many contiguous Rx fan beams. These virtual beams may be dynamically “moved” to different beam positions. The elongated beam direction for Tx fan beam and that for Rx fan beams are perpendicular to one another. Thus intersections of the Tx fan-beam and many Rx fan-beams are the very areas of radar returns. We refer those areas as virtual beam crosses. Conventional range and Doppler gating processing shall then be applied to the beam crosses concurrently. Radar return pixel-by-pixel within various beam crosses are measured individually. Radar images can then be synthesized. MIMO radars via spatial spectrum measurements are well suited for wide angle surveillance via improved angle estimation and minimum detectable velocity. SDS proposed MIMO radar design concepts on moving platforms can be used for both the line-of sight (LOS) SAR/GMTI applications. For fixed Radar, they are applicable for fixed radars LOS target detection and tracking, or imaging. They may also be useful for OTH maritime target detection and tracking utilizing evaporation duct propagation 1. A radar imaging system comprising:a waveform generator configured to generate multiple radar waveforms concurrently;a transmit antenna comprising multiple first array segments, configured to transmit information relating to said radar waveforms to illuminate a ...

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13-05-2021 дата публикации

Scanning device for living objects

Номер: US20210137406A1
Принадлежит: Valtronic Technologies Holding SA

A device for providing a non-contact, time-resolved three-dimensional scan of at least one structural element of a living object which uses microwaves, that comprises besides at least one antenna element, at least one transmitter and at least one receiver, at least one comparator for comparing emitted microwaves and microwaves which are reflected off and at least one analyzer for analyzing at least one property of the emitted microwaves and the received microwaves out of the group of time, frequency, phase, polarization and amplitude. Further the device comprises at least one control and/or processing unit designed for repetitively sampling two-dimensional images in which each pixel contains information about the precise distance and/or velocity of said structural elements towards the antenna elements. The invention allows a repeated spatial reconstruction of the structural element in a living object.

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09-06-2022 дата публикации

System and method for remote dam monitoring

Номер: US20220179064A1
Автор: Henry Brown, Todd Sajwaj
Принадлежит: Rezatec Ltd

A system and method for identifying damage to an embankment includes acquiring satellite imagery of an area of the embankment, generating a set of input data from the satellite imagery, removing at least one anomaly in the set of input data to obtain a cleaned set of input data, and identifying the damage by determining a dam motion area indicative of ground motion in the embankment from the cleaned set of input data and determining an anomalous vegetation area and an anomalous wetness area indicative of seepage in the embankment from the cleaned set of input data.

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09-06-2022 дата публикации

SYNTHETIC-APERTURE-RADAR IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD

Номер: US20220179065A1
Принадлежит: NEC Corporation

The synthetic aperture radar image processing device includes time-series analysis unit which extracts persistent scatterers from time-series observation data for the observation direction for an observation area observed from multiple observation directions by a radar, and calculating displacement speeds of the extracted persistent scatterers, clustering unit which generates reflection point clusters by clustering extracted persistent scatterers based on their phase and position, distance calculation unit which calculates a distance between each of the persistent scatterers included in the reflection point clusters and each structure included in the observation area, representative value calculation unit which calculates each representative value for the distance between each persistent scatterer and each structure, for each reflection point cluster, and corresponding structure determination unit which associates the structure corresponding to the smallest representative value with the persistent scatterer, for each reflection point cluster. 1. A synthetic aperture radar image processing device comprising:a time-series analysis unit which extracts persistent scatterers from time-series observation data for the observation direction for an observation area observed from multiple observation directions by a radar, and calculating displacement speeds of the extracted persistent scatterers,a clustering unit which generates reflection point clusters by clustering extracted persistent scatterers based on their phase and position,a distance calculation unit which calculates a distance between each of the persistent scatterers included in the reflection point clusters and each structure included in the observation area,a representative value calculation unit which calculates each representative value for the distance between each persistent scatterer and each structure, for each reflection point cluster, anda corresponding structure determination unit which associates the ...

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17-07-2014 дата публикации

SYSTEMS AND METHODS FOR AUTOTILTING A GROUND-MAPPING RADAR

Номер: US20140197985A1
Принадлежит: HONEYWELL INTERNATIONAL INC.

Systems and methods that utilize a terrain database to find the elevation of the ground in the area of ground-mapping illumination to optimize the tilt of a ground-mapping antenna. An exemplary system located on a host aircraft includes a memory that stores terrain elevation data and a component that provides height, position, and orientation information of the host aircraft. A processor receives the height, the position, and the orientation information; defines a desired terrain area to be mapped, based on the received information; retrieves terrain elevation data from the memory, based on the desired terrain area to be mapped; and calculates at least one tilt angle for a ground-mapping radar function based on the retrieved terrain height value and the aircraft's height, position, and orientation information. One or more actuators is commanded to move an antenna based on the calculated at least one tilt angle. 1. A method comprising: receiving height, position, and orientation information of a host aircraft;', "defining a desired terrain area to be mapped, based on the received host aircraft's height, position, and orientation information;", 'retrieving an average terrain height value for the desired terrain area to be mapped; and', "calculating at least one tilt angle for a ground-mapping radar unit based on the retrieved terrain height value and the aircraft's height, position, and orientation information; and"], 'at a processor,'} 'moving the antenna based on the calculated at least one tilt angle.', 'at a radar tilt system coupled to an antenna,'}2. The method of claim 1 , wherein defining comprises defining the desired terrain area based on a predefined azimuth value and a predefined tilt range.3. The method of claim 1 , further comprising claim 1 , at the processor claim 1 ,determining an average terrain height value of the retrieved terrain elevation data,wherein calculating the at least one tilt angle is further based on the determined average terrain ...

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28-04-2016 дата публикации

ADAPTIVE COMMUNICATION FOR MOBILE ROUTER SYSTEMS

Номер: US20160119798A1
Принадлежит:

An approach to adaptively positioning a set of mobile routers to provide communication services to a set of clients makes use of estimated direction profiles of communication between routers and clients. The approach does not rely on a Euclidean model in which communication characteristics (e.g., signal strength, data rate, etc.) depend on distance between communicating nodes, and does not necessarily require sampling of communication characteristics in unproductive directions in order to move the routers to preferable locations. 1. A method for adaptively locating a set of mobile routers providing wireless communication services to a plurality of clients , the method comprising , at a first mobile router of the set of mobile routers: determining a direction profile characterizing direction-dependence of one or more signal paths between the first router and the client, and determining using the direction profile directional information comprising at least one or a communication direction between the router and the client and a spread of the direction profile,', 'computing a deficiency in communication service associate with the client and the first router, and', 'providing the directional information and the deficiency in communication for determining a location for the first router; and, 'for each client of a set of clients of the plurality of clients that are in wireless communication with the first router,'}using the determined location for the first router to adapt the location of said router.2. The method of wherein adapting the location of the router comprises causing the router to travel toward the determined location.3. The method of performed at each mobile router of the set of mobile routers.4. The method of performed repeatedly at the first router.5. The method of further comprising determining the location for the first router.6. The method of further comprising determining locations for each router of the set of routers claim 5 , including determining ...

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09-04-2020 дата публикации

GROUND CONTROL POINT DEVICE AND SAR DISPLACEMENT MEASURING SYSTEM

Номер: US20200110171A1
Автор: KIMURA Tsunekazu
Принадлежит: NEC Corporation

A ground control point device includes an SAR wave reflector configured to receive an SAR wave incident from an SAR in an incident direction and to reflect the SAR wave in the incident direction; a GNSS receiver configured to receive a GNSS wave to generate, based on the GNSS wave, time information and positional information indicative of a position of a control point; an SAR wave receiver configured to receive the SAR wave; and a control point data generator/transmitter configured to generate control point data obtained by associating the positional information when the SAR receiver receives the SAR wave with a time instant of reception of the SAR wave that is determined based on the time information, and to transmit the control point data to outside. 1. A ground control point device installed at a control point of a synthetic aperture radar (SAR) displacement measuring system which performs an SAR analysis , the ground control point device comprising:an SAR wave reflector configured to receive an SAR wave incident from an SAR in an incident direction and to reflect the SAR wave in the incident direction;a global navigation satellite system (GNSS) receiver configured to receive a GNSS wave to generate, based on the GNSS wave, time information and positional information indicative of a position of the control point;an SAR wave receiver configured to receive the SAR wave; anda control point data generator/transmitter configured to generate control point data obtained by associating the positional information when the SAR receiver receives the SAR wave with a time instant of reception of the SAR wave that is determined based on the time information, and to transmit the control point data to outside.2. The ground control point device according to claim 1 ,wherein the ground control point device is assigned with a control point ID unique to the ground control point device, andwherein the control point data also includes the control point ID.3. The ground control point ...

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13-05-2021 дата публикации

Scanners, Targets, and Methods for Surveying

Номер: US20210141083A1
Принадлежит:

Apparatus and methods useful in surveying to provide information rich models. In particular, information not readily or possibly provided by conventional survey techniques can be provided. In some versions targets provide reference for baseline positioning or improving position information otherwise acquired. Scanning may be carried out in multiple locations and merged to form a single image. Machine mounted and hand mounted scanning apparatus is disclosed. 1. A target for use in surveying with radar , the target comprising:a support adapted to engage a surface in the zone, the support being made of a radar transparent material;a radar reflector located within the support.2. A target as set forth in wherein the support comprises plural layers of material claim 1 , the radar reflector being located between adjacent layers of the material.3. A target for using in mapping a zone claim 1 , the target comprising:a support;a radar reflector mounted on the support and constructed to strongly reflect radar incident upon the radar reflector;a flash source for flashing electromagnetic radiation, the flash source including a receiver for receiving a signal from a remote scanning device to activate the flash source to emit a flash of electromagnetic radiation detectable by the remote scanning device.4. A target as set forth in wherein the flash source emits electromagnetic radiation detectable by a photographic scanning device.5. A method of imaging a zone to be surveyed comprising:manually transporting a support having a radar scanning device thereon to a first location within the zone;illuminating at least a portion of the zone with radar from the radar scanning device;receiving with the radar scanning device image data including return reflections of the radar emitted from the radar scanning device.6. A method as set forth in further comprising:manually transporting the target to a second location different from the first location;illuminating at least said portion of the ...

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03-05-2018 дата публикации

ELECTROMAGNETIC WAVE IMAGING SYSTEM AND ANTENNA ARRAY SIGNAL CORRECTION METHOD

Номер: US20180120430A1
Принадлежит:

An electromagnetic wave imaging system and a method of correcting an antenna array signal are disclosed. In an example, the electromagnetic wave imaging system may include an antenna array, configured to receive electromagnetic wave from a target object and convert the electromagnetic wave into an electrical signal; a signal processing unit, configured to process the electrical signal to obtain an image of the target object; and a distance measuring device, configured to measure a distance of the target object from the antenna array, wherein the signal processing unit corrects the electrical signal based at least in part on the measured distance. 1. An electromagnetic wave imaging system , comprising:an antenna array, configured to receive electromagnetic wave from a target obj ect and convert electromagnetic wave into an electrical signal;a signal processing unit, configured to process the electrical signal to obtain an image of the target object; anda distance measuring device, configured to measure a distance of the target object from the antenna array,wherein the signal processing unit corrects the electrical signal based at least in part on the measured distance.2. The electromagnetic wave imaging system according to claim 1 , further comprising:a storage unit, configured to store a correction factor at a calibration point for a visibility value between every two antennas in the antenna array,wherein the signal processing unit configured to obtain, for the every two antennas, a correction factor for correcting the electrical signal from the stored correction factors, based on a difference between the distances of the calibration point from the two antennas and a difference between the distances of the target object from the two antennas.3. The electromagnetic wave imaging system according to claim 2 , wherein assuming that for any two antennas i and j in the antenna array claim 2 , a difference between a distance of the calibration point A from the antenna i ...

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04-05-2017 дата публикации

POSITION AND ATTITUDE ESTIMATION DEVICE, IMAGE PROCESSING DEVICE, AND POSITION AND ATTITUDE ESTIMATION METHOD

Номер: US20170123060A1
Автор: YAMASHITA Toshiaki
Принадлежит: NEC Corporation

The present invention makes it possible to enhance the accuracy of position and attitude estimation. A position and attitude estimation device () is provided with a first detection unit () for detecting a plurality of first position and attitude parameters pertaining to the position and attitude of a moving object, a first position and attitude estimation unit () for estimating a first position and attitude of the moving object at a first time on the basis of the plurality of detected first position and attitude parameters, a second detection unit () for detecting a plurality of second position and attitude parameters pertaining to the position and attitude of the moving object, a second position and attitude estimation unit () for estimating a second position and attitude of the moving object at a second time different from the first time on the basis of the plurality of detected second position and attitude parameters, and a position and attitude output unit () for outputting a third position and attitude on the basis of the estimated first position and attitude and second position and attitude. 1. A position and attitude estimation device comprising:first detection unit configured to detect a plurality of first position and attitude parameters pertaining to a position and attitude of a moving object;first position and attitude estimation unit configured to estimate a first position and attitude of the moving object at a first timing, based on the plurality of detected first position and attitude parameters;second detection unit configured to detect a plurality of second position and attitude parameters pertaining to a position and attitude of the moving object;second position and attitude estimation unit configured to estimate a second position and attitude of the moving object at a second timing different from the first timing, based on the plurality of detected second position and attitude parameters; andposition and attitude output unit configured to output a ...

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25-08-2022 дата публикации

METHOD AND APPARATUS FOR PROCESSING SOURCE DATA OF SYNTHETIC APERTURE RADAR IN SATELLITE

Номер: US20220268920A1
Принадлежит:

Disclosed are a method and apparatus for processing source data of a synthetic aperture radar in a satellite, including receiving source data generated based on a signal returned after an electronic device steers a beam from a synthetic aperture radar and backscatters, setting a plurality of subswaths after the electronic device parses the source data, storing based on the plurality of subswaths after the electronic device decodes the source data; and generating image data after the electronic device calls the decoded source data in the order of the plurality of sub swaths. 1. A method for processing source data generated by setting a plurality of swaths in a reception order of a signal that is backscattered after a satellite equipped with a synthetic aperture radar is flying and radiates a beam to the ground using an electronic device , comprising:receiving the source data by an antenna;parsing, by a processor, the source data and grouping the plurality of swaths for each steering direction of the beam and setting the grouped plurality of swaths as a plurality of subswaths in a steering order of the beam;decoding, by the processor, the source data and storing the decoded source data based on the plurality of subswaths; andgenerating, by the processor, image data by calling the decoded source data in the steering order of the plurality of subswaths.2. The method of claim 1 , wherein receiving the source data is receiving the source data including a steering direction of the beam and a flight path of the synthetic aperture radar claim 1 , and information on the plurality of swaths set for each of the steering direction of the beam and the flight path.3. The method of claim 2 , wherein setting the plurality of the sub swaths by the processor comprises:parsing the source data;confirming the steering direction of the beam and the flight path for each of the plurality of swaths based on a result of parsing the source data; andsetting the plurality of sub swaths to group ...

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14-05-2015 дата публикации

SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND PROGRAM

Номер: US20150134712A1
Принадлежит:

To improve the stability of numerical calculation for finding a continuous phase of a pair of signal sequences, provided is a signal processing device () wherein a spline calculation unit () approximates a pair of signal sequences acquired by a signal acquisition unit () by spline functions, and an unwrapping processing unit () performs phase unwrapping using polynomials. The phase unwrapping is performed according to a procedure where a polynomial-sequence calculation unit () calculates a polynomial sequence by applying a Euclidean algorithm to the polynomials of the spline functions, a sign counting unit () checks the number of changes of the sign of a numerical sequence formed by arranging the values of the polynomial sequence in each subinterval where the phase is found, and an unwrapping processing unit () determines an indefinite portion that is an integral multiple of π on the basis of the number of changes. 1. A signal processing device comprising:a signal acquisition unit that acquires a pair of signal sequences;a first calculating unit that calculates a first function and a second function that are piecewise polynomials respectively approximating, by polynomials for each of a plurality of subintervals, the pair of signal sequences acquired by the signal acquisition unit;a second calculating unit that calculates a numerical sequence of values obtained by substituting one point in each of the plurality of subintervals into a polynomial remainder sequence obtained by applying a Euclidean algorithm to the first function and the second function calculated by the first calculating unit;a phase determining unit that determines a phase of the pair of signal sequences at the one point, on the basis of a sign of each term of the numerical sequence calculated by the second calculating unit; anda signal outputting unit that outputs a signal sequence of phases determined by the phase determining unit for each of the plurality of subintervals.2. The signal processing ...

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10-05-2018 дата публикации

System And Method For Estimating The Yield Of A Cultivated Plot

Номер: US20180128914A1
Принадлежит: Ovalie Innovation

The invention relates to a system for estimating the agricultural yield of a cultivated plot comprising a plurality of crops, the system comprising: —a radar unit () having: —a radar () configured to acquire at least one image of the cultivated plot, said radar operating in the field of frequency-modulated continuous waves; —a focusing unit () configured to focus a radar beam in an acquisition direction; a processing unit () configured to carry out steps of: acquiring (E), for each position of the radar; processing (E) the acquired image to extract therefrom at least one data item representative of the yield of the cultivated plot; determining (E) the yield of the cultivated crop on the basis of the extracted data. 1. A system for estimating the crop yield of a cultivated plot comprising a plurality of crops , the system comprising: a radar configured for acquiring at least one image of the cultivated plot, said radar operating in the field of frequency-modulated continuous waves;', 'a focusing unit configured to focus a beam coming from the radar in a direction of acquisition;, 'a radar unit comprisinga processing unit configured to conduct steps of:{'b': '1', 'claim-text': [{'b': '2', 'processing (E) of the acquired image to extract from it at least one datum representative of the yield of the cultivated plot;'}, {'b': '3', 'determination (E) of the yield of the cultivated plot from the extracted data.'}], 'acquisition (E) of at least one image of at least one crop by means of the radar;'}2. The acquisition system according to claim 1 , comprising a unit for moving the radar configured to move the radar in the cultivated plot from one position to another so as to obtain images of at least one crop for each position of the radar claim 1 , the radar scanning the cultivated plot from each position.3. The system according to claim 1 , wherein the focusing unit is constituted by a reflector antenna or an electromagnetic lens or an antenna array.4. The system according ...

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02-05-2019 дата публикации

MICROWAVE AND MILLIMETER WAVE IMAGING

Номер: US20190128999A1

Microwave and millimeter wave imaging. An antenna array in communication with a signal source comprises a plurality of antennas by which a signal generated by the signal source is transmitted incident to an object located remotely from the antenna array and by which a signal reflected from the object is received by the antenna array. The signals transmitted by the antennas collectively have an effective electric field resembling a plane-wave within a target region in front of the antenna array. A plurality of detectors each connected to one of the antennas is configured to simultaneously receive the reflected signal and provide an output signal representative thereof. An image processor configured to execute an imaging algorithm generates a multi-dimensional profile representative of the object based on the output signals from the detectors. 1. An imaging system comprising:a signal source having a transmission line coupled thereto;an antenna array in communication with the signal source via the transmission line, the antenna array comprising a plurality of antennas by which a signal generated by the signal source is transmitted incident to an object located remotely from the antenna array within a target region located in front of the antenna array and by which a signal reflected from the object is received by the antenna array, the signals transmitted by the antennas collectively having an effective electric field resembling a plane-wave within the target region;a plurality of detectors each connected to one of the antennas and configured to simultaneously receive the reflected signal and to provide an output signal representative thereof; andan image processor configured to execute an imaging algorithm for generating a multi-dimensional profile representative of the object based on the output signals from the detectors.2. The system of claim 1 , further comprising a divider network coupled between the signal source and the antenna array claim 1 , said divider ...

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02-05-2019 дата публикации

MEASUREMENT AND IMAGING INSTRUMENTS AND BEAMFORMING METHOD

Номер: US20190129026A1
Принадлежит:

A measurement and imaging instrument capable of beamforming with high speed and high accuracy without approximate calculation. The instrument includes a reception unit which receives a wave arriving from a measurement object to generate a reception signal; and an instrument main body which performs a lateral modulation while superposing two waves in a two-dimensional case and three or four waves in a three-dimensional case in beamforming processing of the reception signal in which at least one wave arriving from the measurement object is processed as being transmitted or received in the axial direction or directions symmetric with respect to the axial direction to generate a multi-dimensional reception signal, performs Hilbert transform with respect to the multi-dimensional reception signal, and performs partial derivative processing or one-dimensional Fourier transform to generate analytic signals of the multi-dimensional reception signals of the two waves or the three or four waves. 1reception means configured to receive, when at least one wave is transmitted from at least one wave source positioned in an arbitrary direction to a measurement object, a wave arriving from the measurement object by using at least one reception aperture element to generate at least one reception signal; andan instrument main body configured to perform a lateral modulation in beamforming processing of the at least one reception signal generated by the reception means to generate a multi-dimensional reception signal, and perform a Hilbert transform with respect to the generated multi-dimensional reception signal,wherein the instrument main body performs the lateral modulation while superposing two waves in a two-dimensional case and three or four waves in a three-dimensional case in an orthogonal coordinate system using coordinates of an axial direction determined by a direction of an aperture of an arbitrary reception aperture element array and at least one lateral direction orthogonal ...

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07-08-2014 дата публикации

ENHANCED RADAR RANGE RESOLUTION

Номер: US20140218231A1
Принадлежит: Raytheon Company

A synthetic aperture radar imaging method that combines each radar return pulse with a sinusoid to reduce the radar return pulses to a baseband frequency and deskew each radar return pulse. It includes determining a maximum likelihood estimate (MLE) of residual motion parameters for a dominant scatterer on the ground relative to the airborne radar and correcting for errors in inertial navigation system measurements based on the MLE residual motion parameters. It includes convolving each radar return pulse with its corresponding radar transmission pulse to generate a range compressed image for each radar return pulse and generating a sub-band range profile image for each radar return pulse and its corresponding radar transmission pulse based on the corresponding range compressed image that has been corrected for residual motion. Performing bandwidth extrapolation on each sub-band and subsequently combining the three bands to produce an enhanced resolution image without grating lobes. 1. A synthetic aperture radar imaging method , comprising:receiving a plurality of radar return pulses acquired by an airborne radar, wherein each radar return pulse is generated in response to a corresponding radar transmission pulse reflected from objects within a region of interest on the ground;combining each radar return pulse with a sinusoid to reduce the radar return pulses to a baseband frequency;deskewing each radar return pulse to remove effects of its corresponding radar transmission pulse;determining a maximum likelihood estimate (MLE) of residual motion parameters for a dominant scatterer on the ground relative to the airborne radar, based on the deskewed radar return pulses;correcting for errors in inertial navigation system measurements based on the MLE residual motion parameters;convolving each radar return pulse with its corresponding radar transmission pulse to generate a range compressed image for each radar return pulse;generating an original sub-band range profile ...

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08-09-2022 дата публикации

PHASE UNWRAPPING DEVICE AND PHASE UNWRAPPING METHOD

Номер: US20220283294A1
Принадлежит: NEC Corporation

The phase unwrapping device includes coordinate transformation means for transforming coordinates of a map including height information into SAR image coordinates, weight calculation means for determining a place, from the map whose coordinates are transformed into the SAR image coordinate, where phase discontinuity may occur in a phase different image generated from two SAR images and attaching a weight to the place where it is determined that phase discontinuity may occur, and phase unwrapping means for performing phase unwrapping for the phase difference image using the weight. 1. A phase unwrapping device comprising:a coordinate transformation unit which transforms coordinates of a map including height information into SAR image coordinates,a weight calculation unit which determines a place, from the map whose coordinates are transformed into the SAR image coordinate, where phase discontinuity may occur in a phase different image generated from two SAR images and attaches a weight to the place where it is determined that phase discontinuity may occur, anda phase unwrapping unit which performs phase unwrapping for the phase difference image using the weight.2. The phase unwrapping device according to claim 1 , whereinthe phase unwrapping unit includes a discontinuous place calculation unit which calculates a phase discontinuous boundary in the phase difference image using the weight, and an unwrapping process unit which integrates the phase while avoiding the phase discontinuous boundary.3. The phase unwrapping device according to claim 2 , whereinthe weight calculating unit attaches a relatively small weight to between pixels in the place where it is determined that phase discontinuity may occur, andthe discontinuous place calculation unit calculates the shortest path between both ends of an area where the phase difference is greater than a predetermined value, taking into account the weight between pixels, and regards the calculated shortest path as the phase ...

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08-09-2022 дата публикации

SATELLITE-FORMATION-BASED REMOTE SENSING SYSTEM AND CONSTELLATION SYSTEM

Номер: US20220283295A1
Принадлежит:

The present invention relates a remote sensing system, or particularly a satellite-formation-based remote sensing system, wherein comprising: a master satellite provided with an SAR system as a payload thereof, a first concomitant satellite, and a second concomitant satellite, wherein the first concomitant satellite and the second concomitant satellite fly around the master satellite, and the master satellite is located on major axes of motion trajectories of the first concomitant satellite and the second concomitant satellite, so as to define a first spatial baseline and a second spatial baseline that have an identical cross-track baseline component. The present invention enables high-precision, wide-range, three-dimensional imaging based on the satellite-formation, while acquires spatiotemporal features of variation of a ground region according to the synchronization in terms of time, frequency, and space. 1. A remote sensing system , or particularly a satellite-formation-based remote sensing system , comprising:a master satellite provided with a synthetic aperture radar (SAR) system as a payload thereof, a first concomitant satellite, and a second concomitant satellite,wherein the first concomitant satellite and the second concomitant satellite fly around the master satellite, and the master satellite is located on major axes of motion trajectories of the first concomitant satellite and the second concomitant satellite, so as to define a first spatial baseline and a second spatial baseline that have an identical cross-track baseline component.2. The system of claim 1 , wherein the master satellite is provided with an imaging and sensing device claim 1 , and a synchronizing device as payloads thereof claim 1 ,wherein the synchronizing device forms the first spatial baseline and the second spatial baseline in time series based on synchronization in terms of time, frequency, and space; andwherein the imaging and sensing device acquires spatiotemporal features of ...

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30-04-2020 дата публикации

TECHNOLOGIES FOR OPPORTUNISTIC SYNTHETIC APERTURE RADAR

Номер: US20200132832A1
Автор: Alalusi Sayf
Принадлежит:

This disclosure is enables various technologies involving various actions based on augmentation of readings of distance sensing units. 1. A device comprising: cause a plurality of signals to be transmitted via the transmitter,', 'cause a plurality of echoes to be received via the receiver, wherein the echoes are based on the signals being reflected off an object, wherein the echoes include a plurality of digital data units,', 'decode the digital data units,', 'determine a plurality of times of flight of the signals based on the digital data units as decoded,', 'form a plurality of readings based on the times of flight,', 'obtain a reading from the IMU contemporaneous to the readings, wherein the reading is based on a motion of the structure relative to the object,', 'perform a fusion of the readings and the reading,', 'perform a tracking of the motion of the structure based on the fusion,', 'determine a location of the object relative to the structure based on the tracking, and', 'take an action based on the location., 'a structure hosting a processor, a memory, a transmitter, a receiver, and an inertial measurement unit (IMU), wherein the processor is in communication with the memory, the transmitter, the receiver, and the IMU, wherein the memory stores a set of instructions executable via the processor, wherein the set of instructions instructs the processor to2. The device of claim 1 , further comprising a geolocation receiver claim 1 , wherein the structure hosts the geolocation receiver claim 1 , wherein the processor is in communication with the geolocation receiver claim 1 , wherein the set of instructions instructs the processor to:receive a geolocation from the geolocation receiver contemporaneous to the readings, andfuse the readings, the reading, and the geolocation such that the location relative to the structure is determined.3. The device of claim 1 , wherein the object is stationary.4. The device of claim 1 , wherein the object is moving.5. The device ...

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21-08-2014 дата публикации

SYNTHETIC APERTURE RADAR MAP APERTURE ANNEALING AND INTERPOLATION

Номер: US20140233791A1
Автор: Peterson Timothy T.
Принадлежит: Raytheon Company

A method for repairing, bridging, or extrapolating an existing aperture to improve image interpretability in synthetic aperture radar images. 1. A method for repairing , bridging , or extrapolating an existing aperture to improve image interpretability; comprising:determining a size of a corrupt data region embedded in or adjacent to an existing set of aperture data;identifying a border region of uncorrupted data contiguous with the corrupt data region;selecting an uncorrupt data region from the set of existing aperture data, disjoint from the border region and the corrupt data region, where the uncorrupt data region is selected to be able to completely overlay the corrupt data region and the border region at multiple translational offsets;forming an extended basis set of vectors, X, from a one-dimensional mapping of uncorrupted data registered to each point in the border region, for each translational offset;forming an auxiliary set of vectors, A, from a one-dimensional mapping of uncorrupted data registered to each point in the corrupt data region, for each translational offset;{'sub': top', 'top', 'top, 'forming a reduced basis set of vectors, S, either by 1) picking selected translational offsets of the extended basis set, identified by peaks of a conjugate correlation between the uncorrupted data and the border region, or by 2) picking one or more top eigenvectors of a singular value decomposition (SVD) of the extended basis set, as X=UDV′, where U is m×m, with m the length of the one-dimensional mapping to each point in the border region, where D is diagonal and m×n, with n the number of translational offsets and m>=n, where V′ is the hermitian conjugate of V, an n×n matrix, and U and V are unitary, with the reduced basis set of vectors formed as S=XV, where Vis composed of the columns of V corresponding to the one or more largest diagonal values of D (top eigenvalues), and with the reduced auxiliary set of vectors formed as S′=AV;'}solving a linear matrix ...

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07-05-2020 дата публикации

Apparatus and methods for a synthetic aperture radar with self-cueing

Номер: US20200142056A1
Принадлежит: Urthecast Corp

A synthetic aperture radar (SAR) system and method of operation advantageously implements dynamic self-cueing or autonomous cueing of successive high-resolution SAR data collection based on previously collected wide-swath SAR data, for instance without the intervention of ground-based resources. For example, target detection may be performed on-board a spaceborne or airborne SAR platform using wide-swath SAR data acquired via a first beam at a first frequency band, the first beam pointed at a first angle relative to an along-track direction. Subsequent activities are cued by the platform based on the previously collected wide-swath SAR data. For instance, the SAR platform may cue subsequent acquisition of SAR data via a second beam at a second frequency band, the second beam pointed at a second angle relative to an along-track direction. The SAR platform may advantageously employ a multi-band SAR antenna.

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11-06-2015 дата публикации

SYNTHETIC APERTURE RADAR SYSTEM

Номер: US20150160337A1
Автор: Muff Darren George
Принадлежит:

The present application is concerned with low cost, and generally broad bandwidth, synthetic aperture radar systems, and methods of producing synthetic aperture radar images. 1. A synthetic aperture radar system comprising a transmitter , an analogue repeater , and a ground based receiver , wherein:the ground based receiver comprises an analogue to digital converter,the transmitter is space-borne or airborne,the analogue repeater is space-borne or airborne,the synthetic aperture radar system is a bistatic radar system.2. The synthetic aperture radar system of claim 1 , where the analogue repeater is airborne.3. The synthetic aperture radar system of claim 2 , where the transmitter is space-borne.4. The synthetic aperture radar system of where the analogue repeater is adapted to operate at a frequency of at least 30 GHz claim 1 , at least 40 GHz or at least 50 GHz.5. The synthetic aperture radar system of claim 1 , where the transmitter is adapted to operate in at least two frequency ranges including a first frequency band around 300 MHz and a second frequency band at at least 35 GHz.6. The synthetic aperture radar system of claim 1 , where the analogue repeater is adapted to operate at the Ka-band.7. A method of producing a synthetic aperture radar image comprising:transmitting an analogue signal from a space-borne or airborne transmitter to a surface to be imaged,reflecting the analogue signal from the surface to a space-borne or airborne analogue repeater,transmitting the analogue signal from the airborne analogue repeater to a ground based receiver,converting the analogue signal received by the ground based receiver into a digital signal,processing the digital signal to create the synthetic aperture radar image, wherein, the method is performed bistatically.8. The method of producing a synthetic aperture radar image of claim 7 , where the analogue repeater is airborne.9. The method of producing a synthetic aperture radar image of claim 8 , where the transmitter ...

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09-06-2016 дата публикации

MICRO CLIMATE CORRECTIONS FOR RADAR INTERFEROMETRY MEASUREMENTS

Номер: US20160161608A1
Автор: Conquest Curt
Принадлежит:

A method for monitoring movement of a surface using ground based radar interferometry measurements includes identifying micro climates on the surface and determining boundaries of the micro climates on the surface. One or more first sensors are arranged at a measurement site for measuring first atmospheric conditions at the measurement site. One or more additional sensors are arranged in each of the micro climates for measuring atmospheric conditions in the micro climates. An atmospheric correction is determined for each of the micro climates. The atmospheric correction for each micro climate is based on the first atmospheric conditions at the measurement site and the atmospheric conditions at the micro climate. The ground based radar interferometry measurements are performed across the surface, and the ground based radar interferometry measurements within the boundary of each micro climate are corrected using the atmospheric correction for the micro climate. 1. A method for monitoring movement of a surface using ground based radar interferometry measurements , where the surface extends over an area that includes micro climates , the method comprising:identifying the micro climates on the surface;determining boundaries of the micro climates on the surface, each of the micro climates extending across a portion of the surface;arranging one or more first sensors at a measurement site, the one or more first sensors for measuring first atmospheric conditions at the measurement site, the measurement site being a location from which the ground based radar interferometry measurements are performed;arranging one or more additional sensors in each of the micro climates, the one or more additional sensors for measuring atmospheric conditions in each of the micro climates;determining an atmospheric correction for each of the micro climates, the atmospheric correction for each micro climate based on the first atmospheric conditions at the measurement site and the atmospheric ...

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07-06-2018 дата публикации

In-Phase (I) and Quadrature (Q) Imbalance Estimation in a Radar System

Номер: US20180156910A1
Принадлежит:

A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements. 1. A radar system comprising:transmission signal generation circuitry operable to generate a continuous wave signal;a transmit channel coupled to the transmission generation circuitry to receive the continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range;a receive channel coupled to an output of the transmit channel via a feedback loop to receive the test signal, the receive channel comprising an in-phase (I) channel and a quadrature (Q) channel;a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle; anda processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the energy measurements collected by the statistics collection module.2. The radar system of claim 1 , further comprising a power detector coupled to the feedback loop to measure power of the test signal ...

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08-06-2017 дата публикации

AMPLITUED CALIBRATION OF A STEPPED-CHIRP SIGNAL FOR A SYNTHETIC APERTURE RADAR

Номер: US20170160381A1
Принадлежит:

A Radar Calibration Processor (“RCP”) for calibrating the amplitude of a stepped-chirp signal utilized by a synthetic aperture radar (“SAR”) is disclosed. The RCP includes a periodic amplitude error (“PAE”) calibrator, first non-periodic amplitude error (“NPAE”) calibrator in signal communication with the PAE calibrator, and a second NPAE calibrator in signal communication with the first NPAE calibrator. 1. A Radar Calibration Processor (“RCP”) for calibrating the amplitude of a stepped-chirp signal utilized by a synthetic aperture radar (“SAR”) , the RCP comprising:a periodic amplitude error (“PAE”) calibrator;a first non-periodic amplitude error (“NPAE”) calibrator; anda second NPAE calibrator,wherein the first NPAE calibrator is in signal communication with both the PAE calibrator and the second NPAE calibrator.2. The RCP of claim 1 ,wherein the PAE calibrator is configured to receive video phase history (“VPH”) data from the SAR and, in response, produces PAE calibrated data from the VPH data andwherein the VPH data includes a plurality of steps within a stepped-chirped waveform and a range frequency.3. The RCP of claim 2 , wherein the PAE calibrator is further configured toperform an azimuth compression on the VPH data to produce azimuth compressed input data,concatenate the azimuth compressed input data into concatenated data,define functional descriptions for optimization of the azimuth compressed input data,establish an error model based on the functional descriptions,search for optimum coefficients of one or more Legendre polynomials to determine a minimum image quality metric (“IQM”) for the error model,determine an estimated PAE using the optimum coefficients of the error model, andapply the estimated PAE to the azimuth compressed input data.4. The RCP of claim 3 , wherein the configuration of the PAE calibrator to define the functional descriptions for optimization includes{'sub': 'pae', '(a) determining an expression for a PAE amplitude error of order ...

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16-06-2016 дата публикации

RADAR SYSTEM AND RADAR SIGNAL PROCESSING DEVICE

Номер: US20160170018A1
Автор: Yamaoka Tomoya
Принадлежит: Mitsubishi Electric Corporation

Disclosed is a radar signal processing device including frequency domain convertors - to -M to convert raw data - to -M showing observation results acquired by a radar device into those in a frequency domain, a signal restorer to synthesize the raw data - to -M whose domain is converted into the frequency domain according to a least square method, a time domain convertor to return a signal series after synthesis to that in a time domain, and an image reproducer to acquire a reproduced image by performing image reproduction on the signal series whose domain is returned to the time domain,

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14-06-2018 дата публикации

System and method for predicting the performance of a radar

Номер: US20180165121A1
Принадлежит: Raytheon Co

A system and method for planning radar missions. The system includes a processing unit and a display. The method includes estimating the execution time of a plurality of radar tasks to be executed periodically at respective planned repetition rates, and assessing, using rate monotonic scheduling, whether the tasks can be executed at their respective planned repetition rates. The display may be employed to display a graphical representation of a path to be flown repeatedly by the aircraft, and, superimposed on the displayed path, symbols indicating whether at any point on the path the radar will be able to execute each task at its respective planned repetition rate, and whether each of a plurality of areas to be surveyed by the radar, each corresponding to a respective radar task, is in the field of view pattern of the radar.

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29-09-2022 дата публикации

Motion Extended Array Synthesis For Use in High Resolution Imaging Applications

Номер: US20220308202A1
Автор: Kendra John R.
Принадлежит: Leidos, Inc.

A process and systems for constructing arbitrarily large virtual arrays using two or more collection platforms (e.g. AUX and MOV systems) having differing velocity vectors. Referred to as Motion Extended Array Synthesis (MXAS), the resultant imaging system is comprised of the collection of baselines that are created between the two collection systems as a function of time. Because of the unequal velocity vectors, the process yields a continuum of baselines over some range, which constitutes an offset imaging system (OIS) in that the baselines engendered are similar to those for a real aperture of the same size as that swept out by the relative motion, but which are offset by some (potentially very large) distance. 1. An offset-spatial-frequency imaging system for imaging a target , comprising:a first antenna system and second antenna system, wherein the first and second antenna systems are in relative rotational motion, and further wherein the first and second antenna systems collect temporally distributed individual signals from one or more target emitters; anda processor for receiving the temporally distributed individual signals from the first and second antenna systems and constructing a continuum of temporally distributed interferometric signal baselines of the one or more target emitters.2. The system of claim 1 , wherein at least one of the first and second antenna systems are moving.3. The system of claim 2 , wherein at least one of the first and second antenna systems are rotating.4. The system of claim 1 , wherein the target contains multiple emitters including at least one of the group consisting of co-channel and ultra-weak emitters claim 1 , and further wherein each of the multiple emitters is imaged by the system.5. The system of claim 1 , wherein the first and second antenna systems are in orbit around a space-based mass and further wherein the first antenna system is connected by a first tether to a circumference of a rotating body and rotates in a ...

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21-06-2018 дата публикации

METHOD AND APPARATUS FOR MULTIPLE RAW SENSOR IMAGE ENHANCEMENT THROUGH GEOREGISTRATION

Номер: US20180172822A1
Автор: Phillips Daniel T.
Принадлежит: The Boeing Company

A method and apparatus for generating an image from raw sensor data. In one embodiment, the method comprises reading a plurality of raw sensor data sets from one or more sensors at a plurality of sensor inertial states, generating an estimate of each of the plurality of sensor inertial states, and while retaining each of the raw sensor data sets, generating an image, the image generated at least in part from the plurality of estimated sensor inertial states and the plurality of raw sensor data sets, and generating an updated estimate of at least one of the sensor inertial states, the updated estimate of the at least one of the sensor inertial states generated at least in part from the generated image and the plurality of estimated sensor inertial states. Finally, an enhanced image is generated from the retained raw sensor data sets and the updated estimate of the at least one of the sensor inertial states. 1. A method of generating an image , comprising:reading a plurality of raw sensor data sets, each raw sensor data set read from one or more sensors at a plurality of sensor inertial states;generating an estimate of each of the plurality of sensor inertial states; generating an image, the image generated at least in part from the plurality of estimated sensor inertial states and the plurality of raw sensor data sets; and', 'generating an updated estimate of at least one of the sensor inertial states, the updated estimate of the at least one of the sensor inertial states generated at least in part from the generated image and the plurality of estimated sensor inertial states;, 'retaining each of the raw sensor data sets while performing steps comprisinggenerating an enhanced image from the retained raw sensor data sets and the updated estimate of the at least one of the sensor inertial states.2. The method of claim 1 , wherein: 'generating an updated estimate of each of the plurality of sensor inertial states, the updated estimate of each of the plurality of sensor ...

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21-06-2018 дата публикации

SYSTEMS AND METHODS FOR REMOTE SENSING OF THE EARTH FROM SPACE

Номер: US20180172823A1
Автор: Tyc George
Принадлежит:

A constellation of satellites may include a plurality of satellites in each of two or more different orbits. Satellites in a given orbit may operate in pairs, flying in tandem, one satellite leading, the other trailing closely behind, to be positioned to image the same target(s) of interest with substantially the same orientation (geographical coincident) at substantially the same time (temporally coincident). The first satellite may acquire SAR data, determine a location of a target of interest, assess cloud cover, and based on an extent of cloud cover, can acquire additional SAR data or cause the second satellite to capture optical imaging data (e.g., cross-cueing). Selection of orbits can provide a relatively high revisit rate may be obtained, allowing frequent opportunities to image given locations on a planet (e.g., Earth). One or more ground stations communicate with the constellation of satellites, and inter-satellite communications may be employed. 1. A system for remote sensing of the Earth from space , the system comprising:a first plurality of satellites in a first orbit plane wherein the first orbit plane defines a sun-synchronous orbit;a second plurality of satellites in a second orbit plane wherein the second orbit plane defines a first mid-inclination orbit, each of the satellites of the first plurality of satellites and each of the satellites of the second plurality of satellites include a respective Earth observing sensor, and the second orbit plane is selected to provide at least a first determined number of average daily remote sensing opportunities for the system for a first location, the first location within a first determined range of latitudes on the Earth's surface, the first determined number of average daily remote sensing opportunities for the system for the first location being the sum of the average daily remote sensing opportunities for the first location for each of the satellites in the first and the second plurality of satellites; ...

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18-09-2014 дата публикации

ELECTRONIC DEVICE FOR PREVENTING AN ACCIDENTAL TOUCH AND OPERATING METHOD THEREOF

Номер: US20140265631A1
Принадлежит:

An electronic device for preventing an accidental touch and an operating method thereof are disclosed, where the electronic device includes a first input device, a second input device, synthetic aperture radar and a main system. The synthetic aperture radar can sense whether a charged body is positioned near the second input device. When the charged body is positioned near the second input device, a voltage state of the synthetic aperture radar is pulled to a first logic level. When the voltage state of the synthetic aperture radar is in the first logic level, the main system disables the first input device. 1. An electronic device for preventing an accidental touch , the electronic device comprising:a first input device;a second input device;a synthetic aperture radar, configured to sense whether a charged body is positioned near the second input device, such that when the charged body is positioned near the second input device, the voltage state of the synthetic to aperture radar is pulled to a first logic level; anda main system, configured to disable the first input device when the voltage state of the synthetic aperture radar is the first logic level.2. The electronic device according to claim 1 , wherein when the charged body is not positioned near the second input device claim 1 , the voltage state of the synthetic aperture radar is pulled to a second logic level; and the main system enables the first input device.3. The electronic device according to claim 1 , wherein the main system comprises:an embedded controller, electrically connects the first and the second input devices with the synthetic aperture radar, such that when the main system is in a working state, the embedded controller is configured to poll the synthetic aperture radar, and when the voltage state of the synthetic aperture radar is the first logic level, sends a control command to the first input device so that the first input device is disabled.4. The electronic device according to claim 1 ...

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13-06-2019 дата публикации

SYSTEM AND METHOD FOR SYNTHETIC APERTURE RADAR IMAGE FORMATION

Номер: US20190179007A1
Автор: Hansen Charles T.
Принадлежит:

A system and method for forming synthetic aperture radar images. Radar return pulses are grouped into sub-dwells, and their frequency content is separated into frequency sub-bands. A coarse image is formed for each sub-band/sub-dwell combination. The coarse images are iteratively interpolated to higher resolution and combined, to form a single high-resolution synthetic aperture radar image. 1. A method for generating a synthetic aperture radar image of a ground region , the method comprising:performing a coarse image formation operation on a plurality of sub-band sub-dwell arrays to form a plurality of two dimensional coarse image arrays;performing a pixel interpolation operation on each of the plurality of coarse image arrays to form a corresponding plurality of two dimensional first interpolated image arrays, each of the first interpolated image arrays being larger, in each of the two dimensions, than the corresponding coarse image array; andperforming a first coherent subimage formation operation on the plurality of first interpolated image arrays to form a plurality of first summed images,wherein each of the two dimensional coarse image arrays is a coarse ground plane image of the ground region.2. The method of claim 1 , wherein the performing of the coarse image formation operation comprises executing a direct backprojection operation.3. The method of claim 1 , wherein the performing of the coarse image formation operation comprises executing a range migration algorithm operation.4. The method of claim 1 , wherein the performing a pixel interpolation operation on a first coarse image array of the plurality of coarse image arrays to form the corresponding first interpolated image array comprises forming a pixel of the corresponding first interpolated image array as a weighted sum of pixels of a contiguous subarray of the first coarse image array.5. The method of claim 4 , wherein the performing of the pixel interpolation operation further comprises selecting the ...

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13-06-2019 дата публикации

SYNTHETIC ULTRA-WIDEBAND MILLIMETER-WAVE IMAGING FOR TISSUE DIAGNOSTICS

Номер: US20190179008A1

The present disclosure relates to an apparatus and method for synthetically making an ultra-wide imaging bandwidth in millimeter-wave frequencies, resulting in improved image resolutions to values previously unattained. The synthetic approach sums up a number of available sub-bands (channels) to build an unavailable ultra-wideband system. Each channel contains an antenna unit which is optimized for operation within that specific sub-band. The number and position of the channels can be adjusted to cover any frequency range as required for the specific application. 1. A method for imaging tissue, comprising the step of transmitting and/or receiving signals in an ultra-wide bandwidth in a range of millimeter-wave frequencies via an imaging element, said range of millimeter-wave frequencies being divided into a plurality of sub-channels, said imaging element including a plurality of sub-band imaging elements, one for each of said plurality of sub-channels. This application is a continuation-in-part of U.S. patent application Ser. No. 15/895,991 filed Feb. 13, 2018, which claims priority to U.S. Provisional Patent Application Ser. No. 62/458,890 filed Feb. 14, 2017, and claims priority to U.S. Provisional Patent Application Ser. No. 62/630,167 filed Feb. 13, 2018, the entire disclosures of each of the applications listed above being incorporated herein by reference for all purposes.This invention was made with government support under Grant No. 1554402 awarded by the National Science Foundation. The government has certain rights in the invention.The present invention relates to millimeter-wave imaging, particularly for biomedical applications.Millimeter-wave imaging is a relatively mature and low-cost imaging technology. However, it has only been applied in military and commercial settings thus far. Despite the various potential advantages of this technology in the biomedical imaging context, such as high image contrasts and suitable penetration depths, it has not been ...

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15-07-2021 дата публикации

GENERATIVE ADVERSARIAL NETWORK-BASED TARGET IDENTIFICATION

Номер: US20210215818A1
Принадлежит:

A computing machine receives a real synthetic aperture radar (SAR) image including one or more targets. The real SAR image is one of a plurality of real SAR images in a training set. The computing machine generates, for the real SAR image, a model-based target shadow background (TSB) image using a three-dimensional (3D) model of the target. The computing machine generates, for the real SAR image and using an auto-encoder engine, an auto-encoder-generated TSB image using an artificial neural network (ANN). The computing machine computes, using a discriminator engine, an image difference between the auto-encoder-generated TSB image and the model-based TSB image. The computing machine adjusts weights in the auto-encoder engine based on the computed image difference. 1. A generative adversarial network training apparatus comprising:processing circuitry; and receiving a real synthetic aperture radar (SAR) image including one or more targets, the real SAR image being one of a plurality of real SAR images in a training set;', 'generating, for the real SAR image, a model-based target shadow background (TSB) image using a three-dimensional (3D) model of the target;', 'generating, for the real SAR image and using an auto-encoder engine, an auto-encoder-generated TSB image using an artificial neural network (ANN);', 'computing, using a discriminator engine, an image difference between the auto-encoder-generated TSB image and the model-based TSB image; and', 'adjusting weights in the auto-encoder engine based on the computed image difference., 'a memory storing instructions which, when executed by the processing circuitry, cause the processing circuitry to perform operations comprising2. The apparatus of claim 1 , wherein each TSB image identifies each pixel as being associated with the target claim 1 , a shadow or a background.3. The apparatus of claim 1 , the operations further comprising:determining that the auto-encoder-generated TSB image and the model-based TSB image are ...

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06-07-2017 дата публикации

Least squares fit classifier for improved sensor performance

Номер: US20170192088A1
Автор: Herbert U Fluhler
Принадлежит: Individual

An improvement to sensor detection performance is described through use of novel least squares based (or other) sensor measurements fitting, which can significantly improve or increase the sensor Probability of Detection (Pd) while simultaneously improving or decreasing the sensor Probability of False Alarm (Pfa). Instead of just thresholding a scalar magnitude as is done in prior art signal detection methods, the new method seeks to classify time (or space, or spatio-temporal) sequenced Signal measurements from time (or space, or spatio-temporal) sequenced Noise measurements through unique features characteristic of each. The proposed method ma be implemented on most modern Radar Signal Data Processors (SDP) and therefore affords a near term, low cost opportunity to both significantly increase detection and tracking performance and/or enable ready adoption of new additional auxiliary missions currently not possible with resource constrained sensors.

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25-09-2014 дата публикации

BISTATIC INVERSE SYNTHETIC APERTURE RADAR IMAGING

Номер: US20140285371A1
Принадлежит:

Embodiments of synthetic aperture radar systems for mapping Doppler frequency to cross-range to form bistatic inverse synthetic radar images of airborne targets. 1. A bistatic synthetic aperture radar (SAR) imaging method , the method comprising:receiving a plurality of radar return pulses acquired by at least first and second airborne radar platforms, wherein each radar return pulse is generated in response to a corresponding transmission pulse reflected from two or more radar scattering locations on a target;combining each radar return pulse with a sinusoid to reduce the radar return pulses to a base band frequency;deskewing each reduced radar return pulse to remove effects of its corresponding radar transmission pulse;estimating motion parameters of the target based on a maximum likelihood estimation (MLE) applied to the deskewed radar return pulses;performing MLE motion correction to the deskewed radar return pulses based on the estimated motion parameters to generate motion corrected radar return pulses;acquiring position and velocity estimates of the two or more airborne radar platforms and the one or more scattering locations on the target;defining bistatic range and velocity vectors based on the position and velocity estimates of the first and second airborne radar platforms, the one or more scattering locations on the target, and the motion corrected radar return pulses;defining new bistatic range and velocity vectors by redefining the bistatic range and velocity vectors in a new set of orthogonal axes;projecting vector distance differences between the target radar scattering locations along the new set of orthogonal axes to generate new range and velocity measurements along the new set of orthogonal axes;converting the new range and velocity measurements in order to map Doppler frequency into cross-range, measured in physical units of length; andforming a bistatic SAR image in range and cross-range based on cross-range extent derived from the Doppler ...

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25-09-2014 дата публикации

SYNTHETIC APERTURE RADAR APPARATUS AND METHODS

Номер: US20140285375A1
Автор: Crain Stephen Bryan
Принадлежит: SADAR 3D, Inc.

Synthetic aperture radar apparatus and methods provide for a compact and usable system to scan behind and underneath surfaces. A synthetic aperture radar pod can be portable and self contained for low cost and ease of transportation. The synthetic aperture radar system may be used at close range to the target area without a fixed and predetermined scan pattern and still provide usable three dimensional images of a surface and/or what is behind or beneath the surface. In some embodiments, the synthetic aperture radar apparatus may be used with common vehicles not dedicated to scanning to provide a useful three dimensional image. 1. A synthetic aperture radar pod adapted for movement along a scan path for scanning material in a volume beneath a surface of the volume at a scan area , the synthetic aperture radar pod including:a support structure; a radar transmitter for providing an electromagnetic wave signal;', 'antenna structure operatively connected to the radar transmitter for receiving the electromagnetic wave signal from the radar transmitter and producing a radar signal in response to receiving the electromagnetic wave signal; and', 'a radar receiver operatively connected to the antenna structure for receiving reflected radar signals from the antenna structure, the reflected radar signals indicating distance of the material beneath the surface of the volume from the antenna structure in time delay from production of the radar signal; and, 'a radar system mounted on the support structure, the radar system includinga position indicating system mounted on the support structure adapted to generate information indicative of a position of the radar system corresponding to transmitted and received radar signals.2. A synthetic aperture radar pod as set forth in wherein the synthetic aperture radar pod is self-contained and portable such that components mounted on the support structure are movable together with the support structure.3. A synthetic aperture radar pod as ...

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22-07-2021 дата публикации

SYNTHETIC APERTURE RADAR SIGNAL ANALYSIS DEVICE, SYNTHETIC APERTURE RADAR SIGNAL ANALYSIS METHOD, AND SYNTHETIC APERTURE RADAR SIGNAL ANALYSIS PROGRAM

Номер: US20210223389A1
Принадлежит: NEC Corporation

A synthetic aperture radar signal analysis device includes: an extraction unit that extracts a stable reflection point from time-series data acquired through observation, by a synthetic aperture radar, of a region to be observed from a predetermined observing direction; a generation unit that generates a cluster which is a collection of stable reflection points on the basis of the extracted stable reflection point corresponding to the predetermined observing direction; an association unit that associates the generated cluster corresponding to the predetermined observing direction with a structure indicated by map data corresponding to the region to be observed; and a synthesis unit that performs vector-synthesis of displacement rates for a plurality of the clusters each corresponding to the observing direction associated with the structure. 1. A synthetic aperture radar signal analysis device comprising:an extraction unit which extracts a stable reflection point from time-series data acquired through observation, by a synthetic aperture radar, of a region to be observed from a predetermined observing direction;a generation unit which generates a cluster which is a collection of stable reflection points on the basis of the extracted stable reflection point corresponding to the predetermined observing direction;an association unit which associates the generated cluster corresponding to the predetermined observing direction with a structure indicated by map data corresponding to the region to be observed; anda synthesis unit which performs vector-synthesis of displacement rates for a plurality of the clusters each corresponding to the observing direction associated with the structure.2. The synthetic aperture radar signal analysis device according to claim 1 , comprising a determination unit which determines two or more clusters having overlapping portions from among a plurality of the clusters each corresponding to the observing direction associated with the structure ...

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14-07-2016 дата публикации

System and Method for 3D Imaging Using a Moving Multiple-Input Multiple-Output (MIMO) Linear Antenna Array

Номер: US20160204840A1
Автор: Dehong Liu

A method generates a three-dimensional (3D) scene image of a scene using a MIMO array including a set of antenna by first selecting a subsets of the antennas as transmit antennas and receive antennas. Radio frequency (RF) signal are transmitted into the scene using the subset of transmit antennas while the MIMO array is moving at a varying velocity. The RF signal are received at the subset of receive antennas as MIMO data, which is aligned and regularized. Then, a compressive sensing (CS)-based reconstruction procedure is applied to the aligned MIMO data to generate the 3D image of the scene.

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27-06-2019 дата публикации

SAR Imaging Method for Interferometric Analyses

Номер: US20190196005A1

A SAR imaging method for interferometric analyses is provided, including: receiving raw SAR data related to two or more SAR acquisitions of one and the same area of the earth's surface carried out by one or more synthetic aperture radars; and processing the raw SAR data to generate SAR images. For each SAR acquisition, the respective raw SAR data is processed based on two different sets of processing parameters: a first set that is the same for all the SAR acquisitions and which comprises focusing Doppler parameters computed based on physical Doppler parameters related to all the SAR acquisitions; and a second set which comprises respective radiometric equalization Doppler parameters related to the SAR acquisition and computed based on respective physical Doppler parameters related to the SAR acquisition. Processing includes: focusing the raw SAR data related to all SAR acquisitions based on the focusing Doppler parameters and, for each SAR acquisition, applying a respective radiometric equalization, based on the respective radiometric equalization Doppler parameters, to the respective SAR data to compensate for possible differences in pointing of the synthetic aperture radar(s), without degrading azimuth resolution and without introducing radiometric distortions. 140. A SAR imaging method () for interferometric analyses , comprising:receiving raw SAR data related to two or more SAR acquisitions of one and the same area of the earth's surface carried out by means of one or more synthetic aperture radars, wherein a maximum squint angle difference between or among the two or more SAR acquisitions is smaller than antenna's azimuth angular aperture of the synthetic aperture radar(s);estimating, for each SAR acquisition, respective physical Doppler parameters indicative of pointing of the synthetic aperture radar used to carry out said SAR acquisition; andprocessing the raw SAR data so as to generate SAR images;characterized in that, for each SAR acquisition, the ...

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27-06-2019 дата публикации

Light-Weight Radar System

Номер: US20190196007A1
Принадлежит:

Disclosed is a light-weight radar system (“LWRS”) for sense and avoid applications in a vehicle. The LWRS includes a plurality of receivers, a plurality of transmitters, an obstacle database, and a processing device. The processing device is in signal communication with the plurality of receivers, plurality of transmitters, and the obstacle database. The processing device includes at least one processor and a computer computer-readable medium (“CRM”) having encoded thereon computer-executable instructions. 1. A light-weight radar system (“LWRS”) for sense and avoid applications in a vehicle , the LWRS comprising:a plurality of receivers;a plurality of transmitters;an obstacle database; anda processing device in signal communication with the plurality of receivers, plurality of transmitters, and the obstacle database, a processor, and', transmit a plurality of transmit radio frequency (“RF”) signals from the plurality of transmitters to one or more targets in an environment of operation of the LWRS,', 'receive a plurality of reflected RF signals at the plurality of receivers from the one or more targets in the environment of operation,', 'perform radar processing on the plurality of reflected RF signals to detect the one or more targets or relevant data from other sources,', 'update the obstacle database with the detected one or more targets, and', 'provide obstacle data to one or more vehicle systems of the vehicle., 'a computer-readable medium (“CRM”) having encoded thereon computer-executable instructions to cause the processor to'}], 'wherein the processing device includes'}2. The LWRS of claim 1 , wherein performing radar processing on the plurality of reflected RF signals to detect the one or more targets includes performingbistatic radar processing,monostatic radar processing,synthetic aperture radar (“SAR”) processing,monostatic and bistatic radar processing,monostatic and SAR radar processing,bistatic and SAR radar processing, andmonostatic, bistatic, and ...

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19-07-2018 дата публикации

ITERATIVE APPROACH TO ACHIEVE ANGULAR AMBIGUITY RESOLUTION

Номер: US20180203108A1
Принадлежит:

A system and method to achieve angular ambiguity resolution in a two-dimensional Doppler synthetic aperture radar system include transmitting pulses using a plurality of transmit elements during movement of a platform on which the system is mounted. Reflections are received from a target resulting from the pulses and the reflections are processed to determine a Doppler measurement. The processing includes isolating movement of the target in the Doppler measurement, and determining a target azimuth angle and a target elevation angle to the target based on an iterative process that includes estimating the target elevation angle or the target azimuth angle and then determining the target azimuth angle or the target elevation angle, respectively, based on a beamforming matrix. The beamforming matrix indicates amplitude and phase at each azimuth angle and each elevation angle among a set of azimuth angles and a set of elevation angles. 1. A method of achieving angular ambiguity resolution in a two-dimensional Doppler synthetic aperture radar system , the method comprising:transmitting pulses using a plurality of transmit elements during movement of a platform on which the system is mounted;receiving reflections from a target resulting from the pulses;processing the reflections to determine a Doppler measurement, the processing including subtracting a component specific to the movement of the platform to isolate movement of the target in the Doppler measurement; anddetermining a target azimuth angle and a target elevation angle to the target based on an iterative process that includes estimating the target elevation angle or the target azimuth angle and then determining the target azimuth angle or the target elevation angle, respectively, based on a beamforming matrix, wherein the beamforming matrix indicates amplitude and phase at each azimuth angle and each elevation angle among a set of azimuth angles and a set of elevation angles.2. The method according to claim 1 , ...

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18-06-2020 дата публикации

Van atta antenna array with patch elements and substrate integrated waveguide

Номер: US20200194887A1
Принадлежит: Southwest Research Institute SwRI

A Van Atta antenna array comprising a number of antenna elements electrically connected to operate as a Van Atta antenna array and fabricated on and within a substrate. Each antenna element has a number of patch elements fabricated on the top surface of the substrate, with the patch elements being interconnected by substrate integrated waveguides. The antenna array provides a two-dimensional retro-reflective surface, which makes it especially suitable for InSAR monitoring of infrastructures.

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25-06-2020 дата публикации

METHOD OF OPTIMIZING PICTURE CAPTURES CARRIED OUT BY AN AIRBORNE RADAR IMAGING DEVICE, AND MISSION SYSTEM IMPLEMENTING SUCH A METHOD

Номер: US20200200895A1
Принадлежит:

A radar imaging device having a mission to produce a radar image of a given target, comprising a step of determining the trajectory of the carrier of the imaging device comprises at least: a phase of determining a segment of trajectory for the picture capture, as a function of the position of the target and of the type of image to be produced, the picture capture segment being dedicated to the picture capture of the target by the imaging device; a phase of adding a segment of trajectory of stabilizing the carrier, situated upstream in the extension of the picture capture segment; a phase of addition of a segment of trajectory for homing the carrier onto the stabilizing segment. 2. The method according to claim 1 , further comprising a step wherein the parameters defining the trajectory are transmitted to the flight management system of the carrier claim 1 , said step following the trajectory determining step.3. The method according to claim 1 , further comprising a step wherein a picture capture activation order is transmitted to the imaging device as a function of the state of advancement of the carrier on the trajectory claim 1 , said step following the trajectory determining step.4. A flight mission system claim 1 , wherein it is configured to implement the method according to . This application is a divisional of U.S. patent application Ser. No. 15/491,865, filed Apr. 19, 2017, which is based on and claims priority from French Patent Application No. FR 1600668, filed Apr. 22, 2016, the entire contents of which are incorporated herein by reference.The present invention relates to a method for optimizing picture captures carried out by an airborne radar imaging device. It also relates to a flight mission system implementing such a method.Certain airborne radars comprise imaging modes making it possible to represent a zone or an object in a certain frequency band.In particular, the SAR (Synthetic Aperture Radar) imaging mode makes it possible to carry out a picture ...

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02-08-2018 дата публикации

INTERFEROMETRIC RADAR WITH ROTATING ANTENNA

Номер: US20180217253A1
Принадлежит:

An interferometric radar comprising an arm (), which rotates with respect to an axis (z) of a plane (zx) orthogonal to an axis of rotation (y), a system of linear-polarization antennas (), which is fixed to said arm () for describing complete revolutions along a circular path (c) about said axis (y) and is oriented in a direction of sight (a) parallel to the axis (y), motor-drive means () for driving the arm (), a data-acquisition and processing unit () operatively connected to said antenna () for acquiring a succession of images detected by the antenna during its revolution about the axis (y) and making differential interferometric calculations for measuring at least one component of the displacement of one or more targets in the field of view, or else for measuring the digital elevation map (DEM) of the scenario in the field of view. 1. An interferometric radar , comprising:an arm, which rotates with respect to an axis of a plane orthogonal to an axis of rotations;a system comprising a rotating antenna with a direction of sight orthogonal to said plane of rotation of said arm, said antenna being fixed to said arm for describing complete revolutions along a circular path about said axis of rotation and being oriented in a direction of sight parallel to said axis of rotation;a motor-drive means for driving said arms; anda data-acquisition and processing unit, operatively connected to said antenna, said data-acquisition and processing unit acquiring a succession of images detected by said antenna during revolution of said antenna about said axis of rotation and said data-acquisition and processing unit making differential interferometric calculations on at least two successive images of one or more targets located in a field of view of said system of one or more antennas in order to measure at least one component of displacement thereof, wherein said data-acquisition and processing unit processes said data detected along two distinct arcs of said circular path and ...

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23-10-2014 дата публикации

ICE KEEL PREDICTION FROM SAR, OPTICAL IMAGERY AND UPWARD LOOKING SONARS

Номер: US20140313072A1
Принадлежит: ConocoPhillips Company

A method correlates satellite image data with data taken from multiple upward-looking sonars moored on the sea floor. The correlation of this information facilitates the prediction of ice thickness in later seasons using synthetic aperture radiation only, thus allowing for the assessment of threats to oil exploration, production or completion facilities located in the Arctic Ocean. 1) A method for near-real time estimation of ice keel thickness using Synthetic Aperture Radar (SAR) , comprising:a) measuring ice thickness, ice direction and ice velocity of sea ice over a plurality of ice profiling upward looking sonars (ULS) and current profiling ULS moored on the seafloor;b) measuring, synchronously, ice movement of said sea ice using airborne optical and synthetic aperture radar imagery and/or optical imagery and/or stereo imagery;c) combining ice thickness data from said ice profiling ULS with ice velocity data from said current profiling USL to form a profile representation of ice keel depth and movement for each moored ULS;d) geographically stepping back a current image obtained from said airborne optical imagery to a previous image using said profile representation while simultaneously stepping forward from previous image to current image and comparing both the forward and back step to make an ice movement movie;e) repeating step d) for all sequential airborne optical image pairs;f) identifying an ice feature that appears in both said ice movement movie and said profile representation for a given said moored upward looking sonar;g) calculating a track line for said ice feature from ice movement movie for said moored ice thickness measurement sonar;h) overlaying said track line for a given ice feature on a synthetic aperture radar backscattering profile;i) superimposing ice thickness measurements obtained from said moored ice profiling ULS over said track line and said synthetic aperture radar image;j) correlating said ice thickness measurements along said track ...

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20-08-2015 дата публикации

Phase reference shift for sar images generated from sub-aperture algorithms

Номер: US20150234043A1
Автор: Michael Y. Jin
Принадлежит: Raytheon Co

Embodiments are directed to generating a plurality of sub-images associated with a target via a synthetic aperture radar, processing, by a processor, the sub-images using a sub-aperture algorithm to generate an intermediate image, and applying, by the processor, a phase shift to the intermediate image to generate an output image.

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09-08-2018 дата публикации

SYNTHETIC-APERTURE INTERFEROMETRIC RADAR WITH AN ANTENNA SLIDING ALONG A ROTATING ARM

Номер: US20180224541A1
Принадлежит:

An interferometric radar comprising an arm (), which rotates with respect to an axis (z) of a plane (zx) orthogonal to an axis of rotation (y), a system of antennas (), which are fixed to said arm (), are able both to move along the arm and to describe complete revolutions along a circular path about said axis (y), and are oriented in a direction of sight (a) parallel to the axis (y), motor-drive means () for driving the arm () and the system of antennas along the arm, a data-acquisition and processing unit () operatively connected to said antenna () for acquiring a succession of images detected by the antenna during its revolution about the axis (y) and making differential interferometric calculations for measuring at least one component of the displacement of one or more targets in the field of view. 1. A synthetic-aperture interferometric radar comprising:an arm, which rotates with respect to an axis of a plane orthogonal to an axis of rotation;a system of one or more transmitting and receiving antennas, which are slidably mounted along said arm so as to be able to describe complete revolutions of variable radius along a circular path about said axis of rotation and said one or more transmitting and receiving antennas are oriented in a direction of sight parallel to said axis of rotation;a motor-drive means for driving rotation of said arm;a motor-drive means for driving bi-directional sliding of said one or more transmitting and receiving antennas along said arm; anda data-acquisition and processing unit, operatively connected to said system of said one or more transmitting and receiving antennas and said data-acquisition and processing unit configured for acquiring a succession of images detected by said one or more transmitting and receiving antennas during rotation of said one or more transmitting and receiving antennas about said axis of rotation and said data-acquisition and processing unit making differential interferometric calculations on at least two ...

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18-08-2016 дата публикации

SATELLITE GEODESY AND RESERVOIR PERFORMANCE

Номер: US20160238704A1
Принадлежит:

Satellite geodesy can identify fault-related surface deformation above onshore oil and gas fields through the use of radar interferometry (InSAR). The method provides an independent and cost-effective approach to identifying faults and damage zones that can be associated with increased reservoir performance beyond traditional tools of subsurface imaging and reservoir evaluation. 1. A method for assessing an onshore hydrocarbon reservoir , comprising:a. obtaining a plurality of synthetic aperture radar images of the Earth's surface;b. identifying and acquiring synthetic aperture radar images covering the onshore hydrocarbon reservoir;c. assessing technical characteristic of the radar images, the technical characteristic selected from the group consisting of: look direction, baseline, temporal coherence, correlation, degree and direction of overlap, spatial resolution, desired temporal coverage, and any combination thereof;d. constructing an interferogram showing ground motion over a selected time interval;e. determining one or more deformations of the Earth's surface, wherein the one or more deformations are near or on the onshore hydrocarbon reservoir;f. identifying a fault in the Earth's subsurface, wherein the fault provides leakage path for a subsurface fluid;g. interpreting magnitude and pattern of ground motion that indicate currently or recently active displacement along the fault at the Earth's surface;h. correlating interpreted magnitude and pattern of ground motion with independent surface or subsurface data;i. using the interferogram to identify currently or recently active fault to augment or test subsurface data and interpretation regarding reservoir performance;j. revising one or more operational parameters related to hydrocarbon recovery; andk. recovering the hydrocarbon from the leakage path by using drilling, completion, or reservoir engineering techniques.2. The method of claim 1 , wherein the Earth's surface is near a subduction zone.3. The method ...

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01-08-2019 дата публикации

Synthetic-aperture radar device

Номер: US20190235070A1
Автор: Noboru Oishi
Принадлежит: Mitsubishi Electric Corp

A synthetic-aperture radar device of the present invention is the one having: a focal point information storing unit storing a plurality of pieces of focal point information determining positions of focal points; an image reproducing unit reproducing each radar image corresponding to the plurality of pieces of focal point information stored in the focal point information storing unit from a reception signal of a radio wave applied from a moving platform to an observation target and reflected by the observation target; an index calculating unit calculating an index representing an image forming state of the radar image reproduced by the image reproducing unit for each predetermined area; and a synthesizing unit synthesizing the plurality of radar images on the basis of the index calculated from each of the plurality of radar images, enabling obtaining a clear radar image without using positional information of the observation target.

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09-09-2021 дата публикации

GROUND BASED SYNTHETIC APERTURE RADAR (GBSAR) WITH TRANSMITTING AND RECEIVING MULTIPLE ANTENNAS (MIMO) AND USING THE PROCESSING TECHNIQUE CALLED COMPRESSIVE SENSING (CS)

Номер: US20210278528A1
Принадлежит:

Ground radar apparatus comprising: at least a main radar unit (U) provided with at least a transmitting unit (TX) and at least a receiving unit (RX); two parallel linear guides G and G with antenna securing systems; Nantennas connected to the transmitting unit TX; Nantennas connected to the RX transmitting unit. This radar is a MIMO (Multiple Input Multiple Output) that operates as an interferometric GBSAR (Ground Based Synthetic Aperture Radar) exploiting a particular implementation of the processing technique called Compressive Sensing (CS). In a further configuration of the same radar the parallel linear guides are three, in this way it is possible to acquire two different interferograms of the same scenario that allow to calculate two different components of the possible displacement of the targets. 1. Ground based synthetic aperture radar apparatus comprisinga transmission and reception unit,a number of directional transmitting antennas comprising at least three transmitting antennas operatively connected with the transmission and reception unit to transmit each one to a target arranged in the radar field of view a radar transmission signal of determined wavelength the transmitting antennas being arranged one after the other along a first linear guide with irregular spacings of amplitude equal to different multiples of a pitch,a number of directional receiving antennas operatively connected with the transmission and reception unit to receive each one a number of wavelength reception signals of said determined wavelength from the target and corresponding to said transmission signals transmitted by said transmitting antennas,said receiving antennas being arranged one after the other along at least a second linear guide parallel at a given distance with respect to said first guide, with successive irregular spacings of amplitude equal to different multiples of said pitch; acquiring said reception signals,', 'associating said reception signals with a virtual ...

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20-11-2014 дата публикации

METHOD FOR TRACKING AND FORECASTING MARINE ICE BODIES

Номер: US20140341423A1
Принадлежит: ConocoPhillips Company

A near-real-time tracking and integrated forecasting of marine ice bodies observable on satellite imagery. 1. A method for tracking and forecasting a marine ice body comprising:a. capturing an image and metocean data of an area of interest with a synthetic aperture radar (SAR), wherein the image includes a plurality of pixels;b. detecting any marine ice bodies in the area of interest with the synthetic aperture radar (SAR);c. classifying the plurality of pixels in the image to define a shape and position of the marine ice body;d. repeating steps (a)-(c) at least once to obtain an additional image;e. comparing sequential images, wherein a background trend for motion between images and a shape characteristic are utilized to compare the sequential images, wherein the background trend is determined by establishing a correlation between the sequential images, wherein an ITSARI algorithm is utilized to determine the shape characteristic of the marine ice body;f. solving a trajectory of each ice floe beyond its current position, wherein the metocean data is utilized to solve the trajectory for each the marine ice bodies beyond its current position; andg. updating Gaussian uncertainty parameters with cumulative observations of error from incoming SAR to provide a cone of uncertainty for the forecasted trajectory.2. A method for tracking and forecasting a marine ice body comprising:a. capturing an image and metocean data of an area of interest with any type of satellite imagery, wherein the image includes a plurality of pixels;b. detecting any marine ice bodies in the area of interest with the satellite imagery;c. classifying the plurality of pixels in the image to define a shape and position of the ice floe;d. repeating steps (a)-(c) at least once to obtain an additional image;e. comparing sequential images, wherein a background trend for motion between images and a shape characteristic are utilized to compare the sequential images, wherein the background trend is ...

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