利用脉间跳频和信号增强技术实现低信噪比下雷达距离超分辨
RANGE SUPER-RESOLUTION AT LOW SNR VIA INTERPULSE FREQUENCY HOPPING AND SIGNAL ENHANCEMENT
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摘要: 针对大时带积(TB)线性/非线性调频(LFM/NLFM)脉压信号,本文研究了低信噪比(SNR)下获得雷达距离维超分辨性能的技术和方法。首先提出了一种有效的信号增强算法,并通过脉间跳频的设计获得了不同目标回波非相关性,进而提出了一系列进一步降低超分辨处理的SNR门限的有效方法。计算机模拟表明:同样条件下本文方法较直接频域处理使超分辨估计所需的SNR门限改善了10dB以上,较好地解决了低SNR环境下雷达距离域的多目标超分辨问题。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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