【摘要】 地球自转和非正侧面阵配置会使得天基雷达杂波谱随距离发生变化,呈现出非平稳性,从而严重影响统计STAP方法的杂波抑制性能。为了补偿这种非平稳性,该文提出了一种基于频率非均匀采样的杂波谱配准方法,建立了非均匀谱配准法的数学模型,给出了频率非均匀采样点的选取方法以及谱配准后杂波协方差矩阵的估计方法等。通过对天基雷达的仿真实验表明,上述谱配准法可有效消除杂波非平稳性,获得较好的处理性能。更多还原

【Abstract】 Due to the earth’s rotation or non-sidelooking radar configuration,the spectrum of Space Based Radar (SBR) clutter varies with the range and shows non-stability.The non-stability of clutter will degrade Space Time Adaptive Processing (STAP) performance significantly and should be compensated.A new spectrum registration based method is proposed which uses non-uniformed discrete frequency sampling points.The mathematical model of the non-uniformed spectrum registration method is built.The choices of these non-uniformed discrete frequency samples and the estimate of clutter covariance matrix after compensation are also studied.Simulations show that the proposed spectrum registration method can compensate the non-stability effectively and achieve approximately optimal performance.更多还原