基于DEHT的偽碼引信中多分量FM干擾抑制方法研究
Multi-component FM Interference Excision Method Based on DEHT for Pseudo-random Coded Fuze
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摘要: 在介紹離散進(jìn)化變換(DET)和離散進(jìn)化哈夫變換(DEHT)的基本原理基礎(chǔ)上，詳細(xì)分析了偽碼引信中基于DEHT的多分量FM干擾抑制方法。接收信號首先通過DEHT估計(jì)干擾瞬時(shí)相位，并通過遞歸校正方法減小相位估計(jì)誤差，利用估計(jì)出的干擾瞬時(shí)相位設(shè)計(jì)了一時(shí)變級聯(lián)濾波器，逐個(gè)消去FM干擾。對不同干信比(ISR)情況下的干擾抑制前后的相關(guān)輸出進(jìn)行了仿真分析。分析結(jié)果表明，該方法能有效地去除干擾，相關(guān)輸出得到顯著改善。Abstract: The principle of Discrete Evolutionary Transform(DET) and Discrete Evolutionary Hough Transform(DEHT) are introduced. The method of excising multi-component FM interference for pseudo-random coded fuze system based on DEHT is analyzed in detail. The instantaneous phase of interference is firstly estimated with DEHT and the estimated phase error is decreased through recursive correcting. An adaptive time-varying filter based on the estimated instantaneous phase is set up to excise the interference one by one. The correlator output in different ISR situations is simulated. It is found by simulation that the method can effectively excise the interference and improve the correlator output.
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