偽碼調(diào)相連續(xù)波引信壓制式寬帶干擾抑制的包絡(luò)濾波方法
The Oppressive Broadband Interference Excision through Envelope Filtering for Pseudo-random Code Phase Modulation Fuze System
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摘要: 該文分析了幾種典型壓制式寬帶干擾(BPSK干擾、調(diào)頻干擾)對(duì)偽碼調(diào)相連續(xù)波引信相關(guān)輸出的影響。分析發(fā)現(xiàn)當(dāng)干擾強(qiáng)度超出偽碼調(diào)相引信的抗干擾容限時(shí)，其相關(guān)輸出嚴(yán)重惡化，因此必須在相關(guān)檢測(cè)前對(duì)上述干擾進(jìn)行抑制。提出了一種通過(guò)包絡(luò)濾波的寬帶干擾抑制新方法。接收信號(hào)經(jīng)過(guò)正交解調(diào)輸出I，Q兩路信號(hào)，由I，Q兩路分量獲得解調(diào)信號(hào)的瞬時(shí)包絡(luò)和瞬時(shí)相位。包絡(luò)序列在變換域通過(guò)門(mén)限濾波去除有用信號(hào)和白噪聲成分從而得到干擾信號(hào)包絡(luò)。利用濾波后的包絡(luò)和瞬時(shí)相位重構(gòu)出干擾同相信號(hào)，最后將干擾信號(hào)從I路放大信號(hào)中去除即得到所需信號(hào)。仿真分析發(fā)現(xiàn)該方法能較好地抑制干擾，尤其是對(duì)強(qiáng)干擾，相關(guān)輸出得到明顯改善。該方法計(jì)算簡(jiǎn)單，易于理解，容易工程實(shí)現(xiàn)。
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關(guān)鍵詞:
- 偽碼調(diào)相引信;干擾抑制;包絡(luò)濾波; 壓制式寬帶干擾
Abstract: The effects of several types of oppressive broadband interference (BPSK interference, FM interference) on pseudo noise coded fuze system are analyzed. It is found that the correlation output is deteriorated when the interference power is larger than the anti-interference limit of the fuze system. So it is very necessary to excise the above interference before correlation. A new simple technique of excising interference through envelope filtering is put forward. The received signal is quadrature demodulated to inphase and quadphase signal. The instantaneous envelope and phase are got with the inphase and quadphase signal. The envelope of interference is obtained by envelope notch filtering in the frequency domain. The interference is reconstructed using the notched envelope sequence and the phase sequence. Then the reconstructed interference is subtracted from the received signal. It is found by simulation that the technique proposed in this paper can effectively excise the broadband interference, especially for strong interference. And the correlation output is improved obviously. The technique is easy to be understood. It has low computational complexity and therefore is easy to realize. -
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