一种基于相干性本质的InSAR方位向预滤波方法

摘要

本文针对合成孔径雷达干涉测量(SAR Interferometry,InSAR)数据处理中的方位向预滤波问题,提出了一种改进的InSAR方位向预滤波方法.首先对InSAR成像系统的几何模型和雷达回波相干性的本质进行了分析,在此基础上提出在方位向只有来自相同方位角空间采样位置的回波信号才具有相干性,即能够用于相干干涉处理,然后根据相干性的本质,提出了一种基于相同方位角的预滤波方法.仿真试验结果和实例分析表明,本文提出的方位向预滤波算法能够有效地保留相干性信息,提高SAR图像对之间的相干性.%Aiming at dealing with the problem of azimuth prefiltering during the interferometric processing procedures, this paper proposed an improved method for InSAR azimuth prefiltering. Based on the theoretic analysis of the InSAR imaging geometry and the principles of coherence, this paper proposes that only the radar echoes coming from the space sampling positions with the same azimuth angles are coherent,I.e. .available for interferometric process.Then an improved method for InSAR azimuth prefiltering is proposed according to the same azimuth angle extension. Finally,The computer simulation and practical examples analysis are shown to prove that the proposed algorithm can improve the coherence between complex SAR images while preserving the coherent information effectively.