用投影濾波濾除偽碼體制引信中的AM-FM干擾
AM-FM Interference Excision Using Projection Filtering in Pseudonoise Code Fuzes
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摘要: 在介紹正交投影濾波基本原理的基礎(chǔ)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(hào)的方法,并對(duì)各種情況進(jìn)行仿真分析,最后詳細(xì)推導(dǎo)投影濾波后相關(guān)器的輸出SNR。結(jié)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(guān)器的輸出SNR,而且不會(huì)導(dǎo)致接收端所期望的偽碼的失真,但干擾參數(shù)的估計(jì)誤差對(duì)濾除AM-FM干擾的影響較大。
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關(guān)鍵詞:
- 偽碼; 投影濾波; AM; FM; SNR; 引信
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. -
Amin M G. Interference mitigation in spread spectrum communication systems using time-frequency distributions[J].IEEE Trans. on Sig. Process.1997, 45(1):90-[2]Amin M G, Mandapati G R. Nonstationary interference excision in spread spectrum communications using projection filtering methods. Proc. Asilomar Conference on Signals Systems and Computers, Pacific Grove, CA, 1998:827 - 831.[3]Jang Seong-cheol. Adaptive excision of AM-FM interference in spread spectrum communications [D], University of Pittsburgh,2001.[4]Barbarossa S, Scaglione A. Adaptive time varying cancellation of wideband interferences in spread spectrum communications based on time-frequency distributions[J].IEEE Trans. on Sig. Process.1999, 47(4):957- -
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