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。
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 variety of approaches are suggested to further lower the SNR threshold for range super- resolution. Monte-Carlo simulation results are presented to illustrate the improved performance.
关键词
距离超分辨
信号增强
脉间跳频
雷达系统
Range super-resolution, Signal enhancement, Interpulse frequency hopping, Linear/Nonlinear frequency modulation (LFM/NLFM)
