Multichannel coherent detection method based on sliding window phase shift

Abstract

The invention discloses a multichannel coherent detection method based on sliding window phase shift The method comprises steps: firstly building the mapping relation between a radar echo signal of each channel and the distance between spatial grids and a beam azimuth angle, and forming a retrieval information set of radar echo signal measurement of transmitting and receiving channels corresponding to the spatial grids; secondly extracting all echo signals, included in the spatial grids, of all channels according to a grid information-irradiation model retrieval matrix, carrying out the phase registration between the remaining channels and a receiving and transmitting channel 1 through employing the equal-step sliding window phase shift; finally carrying out the multichannel coherent detection of the spatial grids through employing the signals after registration, and traversing all spatial grids, thereby achieving the detection of a monitoring plane. The method makes the most of the valuable target echo phase information in multiple wave beams of all points after detection, and achieves the multichannel coherent joint detection. The method solves a problem that a conventional method cannot use the echo signal phase information, reduces the calculation amount, improves the signal to noise ratio after echo signal accumulation, and improves the detection performance of multichannel detection.

Description

technical field [0001] The invention belongs to the technical field of radar target detection, in particular to the technical field of multi-site distributed network radar signal level joint target detection. Background technique [0002] With the increasingly complex electromagnetic environment and increasingly precise hard-destroy capability, it is difficult for conventional radar systems to deal with increasingly approaching space targets and stealth targets. With the development of material technology and manufacturing process, stealth targets such as cruise missiles, stealth drones, and stealth aircraft emerge in an endless stream. The small scattering cross section of the latter greatly challenges the modern air defense network system. Such targets can be detected by increasing the power of the transmitter and increasing the aperture of the antenna. However, with huge antennas and fixed positions that are difficult to move, the survivability of precision-guided weapon...

AI Technical Summary

Problems solved by technology

The calculation amount of these methods increases sharply with the increase of the signal bandwidth and the number of channels, resulting in a calculation load that cannot be borne by the calculation resources in engineering implementation. Method [J]. Modern Radar. 2009, 31(5): 30-34.)

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