A Dimensionality Reduction Four-Channel Method for Resisting Main and Sidelobe Interference in Phased Array Radar

Abstract

The invention belongs to the field of signal processing, and discloses a large dimension reduction four-channel mainlobe sidelobe interference-resisting method. The method comprises steps: according to data received by all subarrays, a sum beam, a pitch difference beam, an azimuth difference beam, a dual-difference beam and multiple sidelobe interference beams after dimension reduction are formed respectively; interference-resisting weights of the pitches and beams are obtained, and interference-resisting weights of the azimuths and the beams are obtained; according to the dual-difference beam, the pitch difference beam and the azimuth difference beam, an auto-covariance matrix for the dual-difference beam, a cross-covariance matrix for the dual-difference beam and the pitch difference beam and the cross-covariance matrix for the dual-difference beam and the azimuth difference beam are obtained; and the interference-resisting weight of the azimuth difference beam and the interference-resisting weight of the pitch difference beam are solved; and the azimuths, the beams and the azimuth difference beam after interference resistance along the pitch direction are acquired, and the pitches, the beams and the pitch difference beam after interference resistance along the pitch direction are acquired; and sum difference angle measurement is adopted to obtain the target direction.

Description

Technical field [0001] The invention relates to the field of signal processing, in particular to a method for reducing the dimension of a phased array radar to resist main and sidelobe interference by four channels, which can be used for phased array radar to resist main and sidelobe interference, thereby realizing peace tracking. Background technique [0002] With the increasing complexity of today’s electromagnetic environment and the diversification of interference patterns, various intentional or unintentional man-made or natural electromagnetic interferences cause the array system to be temporarily or reversibly affected and destroyed, increasing the signal processing Complexity and difficulty. In the face of interference from the main body of the antenna beam instead of the sidelobe part, the commonly used typical ADBF will deteriorate the main beam formation of the antenna, and cause the spectral peak shift and the sidelobe level to rise, which seriously affects the direct...

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Problems solved by technology

Li Rongfeng, Wang Yongliang and others published the article "Research on Adaptive Directional Pattern Conservation Method under Main Lobe Anti-jamming" ("Modern Radar" 2002, 24(3): 50-55), which uses the most typical main lobe anti-jamming The interference suppression conformal method based on blocking matrix preprocessing (BMB), and the interference suppression conformal method based on eigenprojection preprocessing (EPB), but for large arrays, it is too much to construct the main lobe anti-interference matrix. Trouble, the computational complexity is too large, so Hu Hang and Zhang Hao published "an improved two-level subarray-level adaptive monopulse method" in the Acta Electronica Sinica ("Acta Electronica Sinica" 2009, 37(9): 1996- 2003)

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