稳健的InSAR动目标检测与测速方法

Robust ground moving target detection and the velocity estimation method

针对干涉合成孔径雷达(InSAR)构型下动目标检测与测速中存在相位耦合以及地形起伏引起的杂波非平稳问题,提出一种动目标检测方法.首先利用两幅SAR图像的相关性进行图像配准,然后进行去平地相位及高程相位补偿,采用噪声子空间投影法,有效地抑制了起伏杂波,实现了InSAR构型中运动目标的检测,进一步提高了动目标检测性能和测速精度.理论分析和实测数据结果证明了该方法的有效性和实用性.

For interferomatric synthetic aperture radar（InSAR） together with the ground moving target indication（GMTI） system,the problems of the terrain interferometric phase coupling and the non-stationary clutter induced by the long across-track baseline arise.To mitigate these problems,an alternative GMTI method is addressed.This method takes advantage of the coherence information to coregister two SAR images,and then removes the local flat-earth phase,compensates the terrain interferometric phase,and finally suppress the non-stationary clutter.Therefore,the GMTI function can be well performed in the existing InSAR system.Compared with conventional methods,the performance of target detection can be enhanced and the accuracy of velocity estimation can be greatly improved.Theoretical analysis and real measured data illustrate the effectiveness and practicability of the proposed GMTI method.