用投影滤波滤除伪码体制引信中的AM-FM干扰

在介绍正交投影滤波基本原理的基础上,具体分析在伪码体制引信中采用投影滤波滤除AM-FM干扰信号的方法,并对各种情况进行仿真分析,最后详细推导投影滤波后相关器的输出SNR。结果表明,用投影滤波方法既能有效地滤除伪码体制引信中的FM干扰,也能很好地滤除AM-FM干扰,从而有效提高相关器的输出SNR,而且不会导致接收端所期望的伪码的失真,但干扰参数的估计误差对滤除AM-FM干扰的影响较大。

AM-FM Interference Excision Using Projection Filtering in Pseudonoise Code Fuzes

Based on principle of orthogonal projection filtering, it is introduced firstly, the method of AM-FM interference excision using projection filtering in pseudo-random code fuzes is analyzed in detail. Moreover, the method in some cases is simulated. And, the correlator output SNR using projection filtering is deduced in detail. The results show that the method could filter not only FM interference effectively, but also AM-FM interference in pseudo-random code fuzes. Furthermore , the method could improve the output SNR, and could not cause distortion to the desired PN code at the receiver. However, estimation error of interference parameters has significantly effect on the performance of AM-FM interference excision using projection filtering.