7results about How to "Improve direction finding accuracy" patented technology

The application relates to a MUSIC direction-finding method based on an underwater information system cross array, and belongs to the technical field of underwater acoustic direction finding. In view of the problems of low signal-to-noise ratio and low direction-finding precision of underwater signal direction finding, the application provides a MUSIC direction-finding method based on an underwater information system cross array. The method is based on a MUSIC algorithm, frequency extraction and spatial spectrum accumulation, a cross array is used to perform direction-finding processing on a signal, the relative position relationship between the signal and the cross array is obtained, a suitable linear array in the cross array is selected to perform direction-finding processing on the signal, and the direction finding of an underwater target acoustic signal under low signal-to-noise ratio can be effectively realized.

The application discloses a kind of optimal arrangement method of non-uniform linear array for direction finding, comprising: based on preset array optimal arrangement model, the position, speed and initial local optimal position of initial quantum particle are generated;Based on preset array optimal arrangement model, the first fitness function based on minimum interval criterion and minimum maximum relative sidelobe level is constructed;Based on the first fitness function, the initial global optimal position of quantum particle is obtained;Based on initial local optimal position and initial global optimal position, the speed and position of quantum particle are updated, and the global optimal position is obtained;Based on global optimal position, the optimal array arrangement result is obtained.The application designs an optimal special array arrangement method based on minimum interval criterion and minimum maximum relative sidelobe level, finds optimal array arrangement mode using discrete quantum particle swarm, and realizes high-precision direction finding of optimal array arrangement under specific conditions and requirements.

The application discloses a kind of satellite transceiver's dual antenna radio frequency channel isolation circuit, comprising: circuit board, main input port, slave input port and signal processing chip;The input circuit of main input port is divided into two ways on the front of circuit board;First road passes to the back of circuit board and is divided into first subcircuit and second subcircuit;First subcircuit is connected to the back B3M frequency conversion processing circuit by first intermediate layer;Second subcircuit is connected with B1M frequency conversion processing circuit;Second input circuit passes to the back and is connected with auxiliary frequency conversion circuit;The input circuit of slave input port passes to the back and is divided into third input circuit and fourth input circuit;Third input circuit passes to the front and is connected with B3S frequency conversion processing circuit;Fourth input circuit is connected to the front B1S frequency conversion processing circuit by second intermediate layer.The present application carries out frequency conversion processing to slave input signal and main input signal respectively on the front and back of circuit board, reduces the direct coupling and radiation interference between signals.

The present application belongs to the field of radio direction finding, and particularly relates to a weak signal high resolution direction finding method of random passive matched filtering. According to the direction finding device and the related parameters of random matched filtering, the array receiving signal of the direction finding device and the reference signal of passive matched filtering are determined; then the random matched filtering sample extraction matrix is determined, and the reference signal of random matched filtering is determined from the reference signal of passive matched filtering according to the random matched filtering sample extraction matrix; then the snapshot signal outputted by random matched filtering and its autocorrelation matrix are determined from the reference signal of random matched filtering and the array receiving signal of the direction finding device; finally, the high resolution spatial spectrum is determined from the autocorrelation matrix, and the direction finding result of random passive matched filtering is determined from the spectral peak position of the high resolution spatial spectrum. The present application can realize the purpose of improving the resolution capability and direction finding precision of signals with similar directions of arrival under the condition of low signal to noise ratio.

The application provides a high-precision direction finding method and system based on amplitude-phase joint feature fusion, comprising: collecting radio signals and preprocessing; calculating the amplitude difference DA and the phase difference of adjacent elements, and constructing a joint feature vector; dynamically weighting and fusing the amplitude and phase features based on the real-time signal-to-noise ratio to obtain a fused direction feature; calculating the spatial spectrum function by using the spatial spectrum estimation technology, and determining the incoming direction angle by searching for the peak value; and finally, performing dynamic smoothing filtering on the continuous measurement results to output a stable direction angle estimate. Through the deep fusion and intelligent weighting of the amplitude and phase features, the direction finding precision and robustness in complex environments such as low signal-to-noise ratio and multipath interference are significantly improved, and the application is suitable for fields such as spectrum monitoring, radio positioning and electronic reconnaissance.

The application relates to a direction-finding method based on array-received data reconstruction, and belongs to the technical field of array signal processing. The application first calculates the covariance matrix of array-received signals, then combines the array flow characteristics to use the elements in the covariance matrix to perform array-received data reconstruction, and finally performs direction finding based on the reconstructed received data matrix, so that the processing gain and the direction-finding precision are further improved. The application can improve the processing gain of array signals and the spatial resolution of array direction finding without increasing the number of array elements and the array aperture. Compared with the traditional beam synthesis method, the application has higher direction-finding precision and sidelobe suppression ratio.

The application discloses a full-space coverage array wave direction estimation method and equipment, the method comprises the following steps: using a single polarization dipole antenna or a double cone antenna to form a three-layer uniform cylindrical array; using a darkroom to collect measured data to construct a calibration data set; obtaining a to-be-measured vector of an unknown signal; operating the to-be-measured vector and the calibration data set to form a spatial spectrum; finding the position of the strongest energy point in the spatial spectrum to obtain wave direction estimation; finding the double polarization calibration data of the strongest energy direction in the calibration data set; and obtaining polarization information estimation through the corresponding double polarization calibration data and the to-be-measured vector. The application can effectively solve the technical problems of insufficient full-space coverage and slow direction finding speed, improve the full-space coverage and timeliness of radar signal direction finding in a complex electromagnetic environment, and has the advantages of less required antennas, low cost and low operation complexity.