基于信号重构的频谱弥散干扰抑制方法

频谱弥散(smeared spectrum, SMSP)干扰是专门针对线性调频脉冲压缩雷达的密集多假目标干扰。依据SMSP干扰信号的周期性特征,提出了一种基于信号重构的SMSP干扰抑制方法。首先,采用奇异值比谱法估计SMSP干扰的子脉冲个数和调频斜率,采用相关运算法估计SMSP干扰的脉冲前沿位置、幅度以及相位参数,得到重构的SMSP干扰。其次,将其从接收信号中减去即可达到抑制干扰的目的。最后,仿真结果表明,即使在较低的干信比和干噪比条件下,干扰抑制比仍可以达到20 dB以上,说明所提方法对SMSP干扰具有较好的干扰抑制效果。

Smeared spectrum jamming suppression method based on signal reconstruction

The smeared spectrum (SMSP) jamming is a new dense multiple false targets jamming which aims specially at linear frequency modulation pulse compression radar. An SMSP jamming suppression method is proposed according to the periodic characteristic of the SMSP jamming. Firstly, the sub-pulse’s number and the frequency rate of the jamming signal are estimated by using the singular value radio (SVR) spectrum, and the pulse leading edge, amplitude and phase of the jamming signal are estimated by using the correlation operation. Then the jamming signal can be reconstructed. Secondly, the jamming signal is suppressed by subtracting it from the received signals. Finally, the simulation results indicate that the jamming suppression ratio can reach at least 20 dB even under low jamming to signal ratio (JSR) and jamming to noise ratio (JNR), which makes clear that the proposed method can suppress the SMSP jamming effectively.