基于ADBF的多通道SAR抗干扰样本选择方法OACSTPCD

To solve the anti-jamming problem of multi-channel SAR,the spatial degree of freedom and adaptive beamforming technology(ADBF)can be used to enhance the desired signal and suppress the interference.In the process of beamforming,it is necessary to estimate the interference-plus-noise covariance matrix by selecting interference and noise data samples when calculating the optional weight vector of each array element.If the selected data samples are mixed with target signals,the target will be misjudged as interference and be suppressed.This paper aims at the sample selection in the anti-jamming process of multi-channel SAR.By eliminating the target component within the main clutter width in the azimuth frequency domain,the interference and noise data samples can be obtained,and then the covariance matrix can be calculated for beamforming.The effectiveness of the proposed method is verified by imaging results of measured data,interference-to-noise ratio(INR)and signal-to-noise ratio(SNR).In comparison with the direct sample selection method,the adaptive sample selection method improves the SNR by nearly 8 dB and decreases the INR by nearly 6 dB,which indicates that the method can effectively retain the target and suppresses the interference.