【摘要】 通过改进合成孔径雷达(SAR)动目标检测(GMTI)的检测方法 DPCA及ATI,并对两种方法的效果进行了对比。DPCA处理步骤为:坐标配准、相位补偿、杂波对消、均值平滑和阈值检测,而ATI处理步骤为坐标配准、相位补偿、杂波对消/干涉、均值平滑和阈值检测,除了第三步有所差异外,其余步骤均一样。在此着重改进坐标配准与相位补偿,为提高配准与补偿的精度以提高动目标检测的准确率,并使用亚像素级的频域配准方法。实测数据证明,经改进后的DPCA和ATI检测效果均良好,即使是强度极弱的动目标也能够被检测到。经对比分析,ATI在动目标检测上有更优良的性能。创新地使用亚像素级的频域配准方法,且该算法为自动算法,对系统参数精度无要求。更多还原

【Abstract】 DPCA and ATI were improved for ground moving target indication(GMTI)of synthetic aperture radar(SAR).Their effects are compared and introduced in this paper. The processing steps of DPCA are coordinate correction,phase compensation,clutter cancellation,mean smoothing and threshold detection,and the processing steps of ATI are coordinate correction,phase compensation,clutter cancellation/interference,mean smoothing and threshold detection,which are the same except for the third step. The sub pixel frequency domain registration method was applied to improving the accuracy of coordinate correction and phase compensation so as to raise the precision of GMTI. The experimental results show that the improved DPCA and ATI detection have great detectability,even if the most weak moving target can be detected. It is found by comparison analysis that ATI has better detection efficiency than DPCA on GMTI. The innovation point of this paper is the sub pixel frequency domain registration method,which is automatic algorithm,and has no requirement to the accuracy of the system parameters.更多还原