利用脈間跳頻和信號增強(qiáng)技術(shù)實(shí)現(xiàn)低信噪比下雷達(dá)距離超分辨
RANGE SUPER-RESOLUTION AT LOW SNR VIA INTERPULSE FREQUENCY HOPPING AND SIGNAL ENHANCEMENT
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摘要: 針對大時(shí)帶積(TB)線性/非線性調(diào)頻(LFM/NLFM)脈壓信號,本文研究了低信噪比(SNR)下獲得雷達(dá)距離維超分辨性能的技術(shù)和方法。首先提出了一種有效的信號增強(qiáng)算法,并通過脈間跳頻的設(shè)計(jì)獲得了不同目標(biāo)回波非相關(guān)性,進(jìn)而提出了一系列進(jìn)一步降低超分辨處理的SNR門限的有效方法。計(jì)算機(jī)模擬表明:同樣條件下本文方法較直接頻域處理使超分辨估計(jì)所需的SNR門限改善了10dB以上,較好地解決了低SNR環(huán)境下雷達(dá)距離域的多目標(biāo)超分辨問題。Abstract: For linear and non-linear frequency modulation (LFM/NLFM) signals with large time-bandwidth product (TB),radar super-resolution in range domain at low SNR is investigated.A novel signal enhancement algorithm based on FFT for LFM/NLFM signals used for preprocessing,which significantly raises the effective signal-to-noise ratio(SNR),is presented.By use of decorrelation between echoes of different targets achieved by pulse-to-pulse carrier frequency hopping,a vvariety of approaches are suggested to further lower the SNR threshold for range super-resolution.Monte-Carlo simulation results are presented to illustrate the inproved performance.
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