运动目标检测是合成孔径雷达信号处理中的一个重要问题。文中分析了星载合成孔径雷达(SAR)回波的时频特性，讨论了魏格纳-维尔时频分布(WVD)及其改进算法对星载合成孔径雷达运动目标的检测效果，比较了魏格纳-维尔时频分布、伪魏格纳-维尔时频分布、平滑伪魏格纳-维尔时频分布的时频聚集性及其对交叉项的抑制程度。并通过仿真Seasat-1卫星参数下的星载SAR回波数据，给出三种时频分布的检测结果。

Moving target detection is very important for si gnal processing of synthetic Aperture Radar. Joint time-frequency distribution of spaceborne synthetic aperture radar and detection capability of WVD and impro ved algorithms in moving target detection of spaceborne SAR are analyzed in this paper. WVD ,PWVD and SPWVD are contrasted in time-frequency collection and cro ss-terms restrained. By simulate the moving target echo in seasat-1 parameters, the detection capability of three kind of time-frequency distribution are prese nted.

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