Short-time matching method for resisting spectrum dispersion interference

The invention provides a short-time matching method for resisting spectrum dispersion interference, which is used for solving the problem of improving signal performance during multi-spectrum dispersion interference in the prior art. According to the method, the suppression of one or more frequency spectrum dispersion interferences is realized through positioning, parameter estimation, filtering, interception, reconstruction and cancellation by using digital channel data of radar, and then the parameter estimation of a target is realized through filtering and detection technologies; performing inverse transformation on the interference data by using a reconstruction technology to obtain estimated interference time domain data; interference suppression is realized through cancellation, signal filtering is realized by using an original filter, and finally target parameters are output through a detector. The method only relates to a digital receiving channel of the radar, and only uses time ...

Method for determining thermal safety management and control of solid oxide fuel cell

The invention provides a method for determining thermal safety management and control of a solid oxide fuel cell (SOFC), which comprises the following steps of: setting four operation parameters of an SOFC system, determining thermal characteristic output and a value range of the SOFC system, and performing sensitivity analysis by adopting a Sobol method according to the four operation parameters and the thermal characteristic output of the SOFC system to obtain a first-order influence index and a total effect index; comparing the first-order influence index with a total effect index to determine an interaction degree between parameters; the SOFC thermal parameter sensitivity analysis result obtained by the method is expected to effectively solve the problems of difficulty in fault mechanism analysis, difficulty in diagnosis process, difficulty in safety control and difficulty in comprehensive control in SOFC system thermal collaborative control research.

Decoding method of cyclic code decoder

The invention relates to a decoding method of a cyclic code decoder. The decoding method comprises the following steps: providing a table of representative error pattern; calculating the syndrome of the table after receiving a digital signal; judging whether the received digital signal has a bit error; directly decoding the digital signal if the received digital signal has no bit error; if the received digital signal has the bit error, correcting the error bit by utilizing the error position polynomial in the table of representative error pattern error, which corresponds to the syndrome that matches the syndrome of the received digital signal; if no matched syndrome is found, calculating a new syndrome by shifting one bit of the received digital signal or the syndrome of the received digital signal, wherein the new syndrome is used for searching an error position polynomial in the table of representative error pattern error, which corresponds to the syndrome that matches the syndrome of ...

Radar target detection method and system based on attention convolutional neural network

The invention provides a radar target detection method and system based on an attention convolutional neural network, and the method comprises the steps: obtaining radar receiving data, carrying out the preprocessing of the radar receiving data, forming a data set, and dividing the data set into a training set and a verification set; and constructing an attention convolutional neural network, training the attention convolutional neural network by using the training set and the data label corresponding to the training set, performing verification by using the verification set, and obtaining a network corresponding to the minimum loss of the verification set as an optimal detection weight network. According to the invention, the learning representation capability and the feature adaptive selection capability of the convolutional neural network can be improved.

Device and method for detecting optical axis consistency of two common aspherical mirrors

The invention discloses a device and a method for detecting optical axis consistency of a two-side integrated large-aperture aspheric reflector, and belongs to the technical field of optical part processing and detection. The device comprises an interferometer and two CGH compensators. In an interference detection light path, the optical axes of the two aspheric surfaces are precisely adjusted and strictly calibrated and then are led out to a CGH compensator, a CGH specific area emits parallel light, and the parallel light is reflected by the other CGH to form interference fringes representing the included angle of the two CGH compensators in an interferometer. And observing and counting the number of interference fringes to solve the optical axis consistency deviation of the two aspheric surfaces. Compared with a traditional interference measurement method which needs to lead out a mechanical reference and uses a theodolite and other high-precision detection instruments for detecting the ...

Flat plate structure based on topological photonic crystal and infrared sensor

The invention provides a flat plate structure based on a topological photonic crystal, and the flat plate structure comprises a plurality of super units which are arranged in an array manner along a first direction and a second direction, and form a matrix. The super unit comprises a topological non-trivial structure and a topological trivial structure, and the topological trivial structure is arranged on the peripheral side of the topological non-trivial structure in a surrounding mode. The topological non-trivial structure comprises a plurality of topological non-trivial units, and the plurality of topological non-trivial units are arranged in an array along a first direction and a second direction and form a matrix; the topological trivial structure comprises a plurality of topological trivial units, and the plurality of topological trivial units form a matrix. The invention further provides an infrared sensor which comprises the flat plate structure and a sensor body, and the flat plate ...

Foundation pit dewatering well water level measurement device

The utility model discloses a foundation pit dewatering well water level measurement device belongs to construction technical field, solves the current inconvenient problem of foundation pit dewatering well detection of water level, include the well head supporter, strut combination pipe, hoisting device and detection mechanism, the upper portion of well head supporter is provided with the fixed part, the vertical combination pipe via hole that is provided with in the well head supporter, strut vertical the passing of combination pipe combination pipe via hole is strutted the combination pipeand is the three -layer pipe, and including outer tube, middle part ventilation pipe and inner tube, the middle part ventilation pipe is a plurality of tubules of equipartition between outer tube andinner tube, combination socle end is provided with the horn mouth, detection mechanism includes controlled testing device and sponge detecting body, and controlled testing device and sponge detectingbody ...

Plasma resonant cavity tunable waveguide device

This invention refers to the tunable wave-guide device of plasma resonant cavity for PCVD optical fiber fabricated bar working machine, which contains vertical crossed two-section wave-guide, horizontal set rectangular wave-guide connected with vertical column wave-guide or coaxial wave-guide through adapter, another end of rectangular wave-guide connected with bi-directional oriented coupler with incident and reflection energy sensor, the automatic tuner is set in rectangular wave-guide. Said invention has advantages of 1, making fine matching of wave-guide system with resonant cavity load to realize real time control for energy couple, 2, raising PCVD working precision and efficiency and service life, 3, simple structure and high automation.

Expansion target parameter adjustable detection method and system under signal mismatch

The invention relates to an extended target parameter adjustable detection method and system under signal mismatch, and the method comprises the steps: constructing a signal steering vector, a to-be-detected data matrix and a training sample matrix, constructing a sampling covariance matrix through employing the training sample matrix, constructing a whitening matrix through employing the sampling covariance matrix, and carrying out the detection through employing the whitening matrix; the method comprises the following steps: firstly, determining a signal steering vector and a to-be-detected data matrix, then whitening the signal steering vector and the to-be-detected data matrix by using a whitening matrix, then determining an adjustable parameter, further constructing a detection statistic, then determining a detection threshold by using the detection statistic and a false alarm probability, and finally comparing the detection statistic with the detection threshold to judge whether a ...

TOOL FOR GROOVING IN STONE HOLE

... 一种用于开裂石材等脆性物，特别是在已钻成石孔内壁刻应力槽的工具，由刀杆３刀头１和定位卡５组成，刀头上有喷孔６和气压源相通，使排屑方便。定位卡５套在刀杆上，避免刀杆转动而造成应力槽偏斜或扭曲。该工具与一般气动凿岩机配套使用，开槽速度快，操作方便省力，槽上应力角锐利，使石材切割整齐，大大方便了石材的开采。 ...

Iterative decoding algorithm of quadratic residue code

The invention discloses an iterative decoding algorithm of a quadratic residue code, which is suitable for decoding all quadratic residue codes. The decoding algorithm comprises the steps of: obtaining a plurality of known characteristic values for providing digital signals; calculateing a plurality of unknown characteristic values with the plurality of known characteristic values; calculating to obtain an error position polynome with a no anti-root bailey root algorithm; and calculating the error position of the error position polynome with a chien search algorithm to be capable of modifying the relative binary digit of the error digital signals to obtain a correct code word. The algorithms can calculate the error position polynome to improve the capability for decoding the quadratic residue code.

Fast and efficient computation of cubic-spline interpolation for data compression

Mutual basic station of wireless device

The utility model discloses a mutual basic station of wireless device, basic station and wireless terminal including communicate with, the basic station includes connection service ware, the web server of two simultaneous workings, the database of router, two simultaneous workings, wireless terminal includes user terminal and the collector terminal that is used for data collection, user and collector pass through router and the communication of connection service ware, the connection service ware can be directly and the database carry out data storage's communication, connection service ware accessible web server carries out data query's communication with the database. The utility model discloses a mutual basic station of wireless device of two connection service wares and two web server + databases makes data transmission's stability, security increase substantially.

Multi-domain joint anti-composite interference method, device and system

The invention relates to the technical field of signal processing, and provides a multi-domain joint anti-composite interference method, device and system, and the method comprises the steps: selecting a first sub-array and a second sub-array which have a rotation invariant relation, and calculating a polarization parameter according to the relation between the first sub-array and the second sub-array; according to the beam direction and the polarization parameter, performing adaptive anti-composite interference processing, and calculating adaptive sum-difference channel data; respectively carrying out pulse compression to obtain compressed sum-difference channel data, and obtaining a target distance according to a data peak value of the compressed sum-difference channel data; and calculating a target DOA value according to the target distance and the compressed sum-difference channel data. According to the method, accumulation of multiple periods is not needed, interference suppression ...

Decoding method of cyclic code weight decoder

The invention relates to a decoding method of a cyclic code weight decoder, which comprises the following steps: a error reducing type list is provided, and the symptom weight is calculated after a digital signal is received; if the weight is zero, no error exists; if the weight is smaller than or equal to the error resolution ability value, all errors are in redundant bit, so that the errors arecorrected according to left-shift the message length bit of the symptom; if the weight is more than the error resolution ability value, at least one error exists in the message bit; and if the a symptom type matched with the symptom exists in the error reducing type list or the weight of the symptom difference is smaller than the detected value, the error is corrected by the corresponding error type and the symptom difference of the left-shift message length bit, otherwise, after the digital signal circulates to the left by redundant block length bits, the weight of the new symptom is recalculated ...

Laminated slab mounting method

The invention provides a laminated slab mounting method, and belongs to the technical field of building construction.The laminated slab mounting method specifically comprises the following steps that laminated slab components enter a site, and the laminated slab components are unloaded and then stacked in order; drawing a laminated slab elevation control line on the shear wall; mounting and laying a plate top template according to the elevation control line; the laminated slabs are hoisted to the slab top formworks at the corresponding positions, and formwork supports of the slab top formworks are made; the adjacent laminated slabs are leveled and checked; the reinforcing steel bars are used for connecting the adjacent composite floor slabs and the wall coupling beams; the binding beam steel bars and the laminated slab upper-layer two-way steel bars form a steel bar net; an electromechanical wire pipe is pre-buried, and a wire box and a hole are reserved; concrete is poured on the laminated ...

Optimization method of micro-nano optoelectronic device and on-chip mode division multiplexer/demultiplexer

The invention discloses an optimization method of a micro-nano optoelectronic device and an on-chip modular division multiplexer/demultiplexer, and the method comprises the following steps: building an initial simulation model of the device, and calculating the quality factor value of the whole simulation model at the moment; selecting a movable vertex of the initial polygon as a search point, and calculating a quality factor value once when the position of the search point is changed once; searching the position of a search point enabling the quality factor value to be optimal; the positions of the search points are kept at the positions where the quality factor values are optimal, the next search point is searched, and all the search points search the optimal positions once as iteration; and iteration is repeated until a set index is reached. According to the optimization method, the optimization speed is high, and a large amount of calculation time and calculation resources can be saved ...

Error detection decoding module and error detection correction device