基于变步长LMS算法的线性调频引信噪声抑制

Anti-Noise for LFM Fuze Based on Variable Step Size LMS Algorithm

利用自适应滤波技术,研究了线性调频引信通带内噪声的抑制问题。根据线性调频信号与噪声可预测性的差异进行噪声抑制,分析了噪声抑制原理。仿真结果表明,在SNB=-5dB时仍然可以达到很好的噪声抑制效果;在算法收敛的条件下,信噪比越小,噪声抑制对信噪比的相对改善越大。

Adaptive filter technique was used to suppress noise inside the passband of LFM fuze. The difference between LFM signal’s predictability and noise’s predictability was used to suppress noise and the principle of anti-noise was analyzed. The simulation results show that when SNR= -5dB, noise can be still suppressed effectively and if the variable step size LMS （least mean squares） algorithm is convergent. The smaller SNR is, the bigger the improvement of SNR after anti-noise is.