摘要:
在介紹正交投影濾波基本原理的基礎上,具體分析在偽碼體制引信中采用投影濾波濾除AM-FM干擾信號的方法,并對各種情況進行仿真分析,最后詳細推導投影濾波后相關器的輸出SNR。結果表明,用投影濾波方法既能有效地濾除偽碼體制引信中的FM干擾,也能很好地濾除AM-FM干擾,從而有效提高相關器的輸出SNR,而且不會導致接收端所期望的偽碼的失真,但干擾參數(shù)的估計誤差對濾除AM-FM干擾的影響較大。
Abstract:
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.
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