GSC结构相控阵在主瓣干扰下的自适应单脉冲方法

doi:10.12305/j.issn.1001-506X.2021.08.15

Abstract

Abstract:

When the sidelobe jamming enters the phased array based on general sidelobe canceller (general sidelobe canceller, GSC) structure, high accuracy of monopulse angle estimation can be maintained by suppressing the sidelobe jamming, but if the interference enters from the mainlobe, the adaptive pattern will be distorted, which resulting in angle measurement errors. Aiming at this problem, an engineering realization method of two-stage adaptive monopulse angle measurement under the GSC structure is proposed. Firstly, the sampling covariance matrix is eigen-decomposed and the eigenvectors corresponding to the mainlobe jamming are separated according to the orthogonality of the mainlobe subspace, which can be used to reconstruct the sidelobe jamming and noise covariance matrix. Then, the sidelobe canceller is used to suppress the sidelobe jamming. Finally, the four-channel system is used to suppress the mainlobe jamming and maintain the monopulse ratio, which can achieve accurate angle measurement of the target. This method doesn't need to pre-estimating the jamming direction, which has stronger robustness. The simulation results demonstrate the effectiveness of the propose method.

Key words: phased array, mainlobe jamming, general sidelobe canceller, adaptive monopulse

CLC Number:

TN957.5

Ziang CHEN, Jiawei YANG, Chenchen TAO. Adaptive monopulse approach under mainlobe jamming of phased array based on GSC[J]. Systems Engineering and Electronics, 2021, 43(8): 2137-2145.

Figures/Tables 13

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Adaptive monopulse approach under mainlobe jamming of phased array based on GSC

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