长M码序列具有大时宽带宽积和低截获率,在雷达对抗中具有较大优势,但长M码序列的非周期相关接收会产生大的距离旁瓣,强回波信号的距离旁瓣会淹没小的回波信号。采用时域的失配滤波法,结合权值迭代修正运算,能够有效地抑制距离旁瓣。但失配滤波法性能的变化情况并无确切分析,文中通过改变回波的信噪比和回波的多普勒频率的方法,测试了失配滤波法的性能的具体变化趋势。结果表明,失配滤波器的旁瓣抑制性能的多普勒容限稍微有所提高,但对多普勒频率非常敏感,并只在高信噪比情况下具有较好的旁瓣抑制能力。

Long M sequences have large time-bandwith products and LPI have advantage in the radar confront, but the development of long M Sequences are blocked because of its high time sidelobes. The pesk sidelobe level is successfully suppressed by the mismatch filter in time dominate. But the performance's variations of mismatch filter that based on SNR and Doppler frequence is unknown. At last, the influence of the SNR and Doppler frequence for the mismatch filter is analysed in this paper, and there is a conclution that the mismatch filter would have a good job while the environment has a high SNR.