基于变分信号分解的脉冲多普勒雷达抗扫频式干扰方法

When the pulse Doppler radar is subjected to sweep-jamming, its receiver channel is saturated by the jamming signal, which causes the radar false alarm or miss alarm. Aiming at the above problem, an IF signal model of pulse Doppler radar under sweep-jamming is established, and a separation method of target echo and jamming based on signal variational decomposition (SVD) is proposed. The proposed method uses total variation regularization to decompose the IF signal into two components: pulse and low-frequency narrowband signal. The pulse corresponds to the target echo, while the low-frequency narrowband signal corresponds to the jamming. The ow-frequency narrowband signal and noise are eliminated, and the pulse is retained and processed to detect the real target. The effectiveness of SVD was verified by simulation. The results show that the method can still effectively separate the target echo and jamming under the condition that signal-to-jamming ratio is lower than - 20 dB, and greatly improve the target detection ability of pulse Doppler radar under the effect of sweep-jamming.