PSInSAR永久散射体的自动探测  

Automatic detection of permanent scatterers in PSInSAR

作　　者：胡波[1,2] 汪汉胜[1] 贾路路[1,2] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学蕈点实验室,武汉430077 [2]中国科学院研究生院,北京100049

出　　处：《测绘科学》2011年第2期50-52,共3页Science of Surveying and Mapping

基　　金：国家杰出青年科学基金项目冰后回弹(40825012)

摘　　要：为了有效探测合成孔径雷达差分干涉测量中的永久散射体,综合考虑永久散射体对雷达波的强反射特性和散射的稳定性,本文提出了三重阈值自动探测算法,即时序相关系数、振幅离差和振幅指数三重阈值串行结合的算法。该方法首先考虑回波信号的高信噪比特性,用平均相干系数和振幅两道阈值挑选出永久散射体候选点,然后考虑永久散射体强稳定性,用振幅离差阈值从永久散射体候选点中进一步精选出永久散射体。最后利用上海地区的24幅ERS1/2 C波段合成孔径雷达图像进行了实验,证实了该方法是有效和可靠的。In order to effectively detect permanent scatterers in differential Interferometry of Synthetic Aperture Radar,a ri-threshold automatic method was proposed in the paper taking into account the characteristics of strong reflection and stable backscattering of permanent scatterers to radar waves.It serially set tri-threshold corresponding to time-series correlation-coefficient,amplitude dispersion index and amplitude index.In this method,considering the characteristic of high signal-noise-ratio,the average correlation coefficients and amplitude were firstly used to choose the initial candidates of permanent scatterers.And then further considering the strong stability of permanent scatterers,the amplitude dispersion threshold was utilized to produce the final permanent scatterers from the candidates.Finally,the proposed method was proved to be effective and reliable by an experiment with 24 ERS1 /2 C-band synthetic aperture radar images in a region of Shanghai.

关 键 词：合成孔径雷达差分干涉测量 永久散射体 自动探测 信噪比 

分 类 号：P23[天文地球—摄影测量与遥感]