星载三通道SAR-DPCA误差分析与动目标定位方法

摘要

针对一发三收模式下星载SAR-GMTI系统利用相位中心偏置天线(DPCA)方法进行杂波抑制时,系统误差和平台运动误差引起的杂波残留问题,提出了一种基于误差补偿的运动目标检测和定位新方法.分析了误差存在的原因,并以消除剩余杂波为目的详细推导出了相应的补偿因子,在此基础上对经过误差补偿后的数据采用DPCA方法进行杂波抑制,最后通过相位干涉处理进行动目标定位.仿真结果验证了算法的有效性.%For residual clutter caused by system errors and motion errors in spaceborne SARGMTI with three-channel when using displaced phase center antenna (DPCA) technology to suppress clutter, a novel method of detection and position for moving target was presented based on error compensation.Aiming at elimination of residual clutter, errors were analyzed in detail and corresponding compensation functions were derived.After compensation, DPCA and interferometric processing were applied to cultter suppression and moving target position.