星载SAR的轨道运动和受地球自转、地球曲率等因素影响,以及卫星平台快速运动造成的地杂波谱展宽甚至占据整个方位谱,这些都使得星载SAR/GMTI的处理方法较机载SAR/GMTI更为复杂.为了有效检测运动目标,必须对地杂波进行抑制.偏置天线相位中心（DPCA）是一种有效的地杂波抑制技术.文中在星载SAR三孔径天线回波信号多普勒特性分析的基础上,结合Raney,R K给出的多普勒参数表达式,推导了一种基于DPCA的星载SAR动目标检测、径向速度分量估计以及目标定位的方法.最后,通过星载SAR/GMTI计算机仿真

Compared with airborne SAR, such factors as complicated spaceborne SAR orbital motion, earth rotation, earth surface curvature as well as clutter spectrum spreading even to all azimuths spectrum due to fast spacecraft velocity etc. make the realization of spaceborne SAR/GMTI complicated. Clutter must be effectively suppressed for moving target detection. DPCA is a useful clutter suppression method. From the analysis of three-antenna spaceborne SAR doppler property and adopting doppler parameter expression given by Raney, R. K. , an algorithm of spaceborne SAR moving target detection, radial velocity estimation and location based on DPCA is developed. Finally, the computer simulation results validated its effectiveness.

TN958

＂十五＂预研资助项目（No.41321040201）