Space Time Adaptive Processing Technique Based on Orthogonal Constraint in Navigation Receiver
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摘要: 衛(wèi)星導(dǎo)航系統(tǒng)容易受到干擾，空時自適應(yīng)處理在導(dǎo)航接收機(jī)抗干擾方面擁有明顯的優(yōu)勢，即系統(tǒng)自由度顯著提高，但是傳統(tǒng)空時自適應(yīng)處理應(yīng)用于導(dǎo)航接收機(jī)抗干擾中卻面臨信號失真的難題。該文提出一種基于正交約束的導(dǎo)航接收機(jī)空時自適應(yīng)處理方法。該方法從空時自適應(yīng)處理的原理入手修改傳統(tǒng)空時自適應(yīng)處理優(yōu)化的約束項，消除了不同時延信號對合成信號的影響，保證了空時自適應(yīng)處理在有效抑制干擾的同時不影響導(dǎo)航信號的捕獲和解碼。理論分析和仿真結(jié)果表明，該方法能有效解決空時自適應(yīng)處理中的導(dǎo)航信號失真問題。
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關(guān)鍵詞:
- 衛(wèi)星導(dǎo)航系統(tǒng) /
- 正交約束 /
- 導(dǎo)航接收機(jī) /
- 信號失真 /
- 空時自適應(yīng)處理 /
- 抗干擾
Abstract: Satellite navigation systems is susceptible to jamming, Space-Time Adaptive Processing (STAP) technique has obvious advantage in the anti-jamming of navigation receiver, i.e. system Degree Of Freedom (DOF) visibly increasing, but traditional STAP would bring serious signal distortion in navigation receiver anti-jamming. In this paper, a novel STAP method based on orthogonal constraint in navigation receiver is proposed. This method modifies the constraint of traditional STAP based on the principle of STAP, avoids the influence of the delay time signal, the jamming is efficiently suppressed by STAP in the acquisition and decoding of navigation signal. Theory analysis and simulation indicate that the novel technique can solve the problem of navigation signal distortion in STAP efficiently. -
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