基于GPS观测量的InSAR干涉图中对流层改正方法及其论证  

A Method to Correct Tropospheric Delay in SAR Interferometry from GPS Observations

作　　者：宋小刚[1] 李德仁[1,2] 廖明生[2] 程亮[2] 

机构地区：[1]武汉大学遥感信息工程学院,武汉市430079 [2]武汉大学测绘遥感信息工程国家重点实验室,武汉市430079

出　　处：《武汉大学学报（信息科学版）》2008年第3期233-236,共4页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(60472039)

摘　　要：利用一种站间和历元间的双差算法来计算InSAR结果的大气改正量。为了逐像素改正InSAR结果,引入自适应参数的支持向量机(SVM),利用稀疏的GPS站网上所获得的大气改正值回归估计未知像元上的对流层改正值。采用南加州GPS集成网络(SCIGN)数据验证了该方法的可行性。A between-site and between-epoch double-differencing algorithm for the generation of tropospheric corrections to InSAR results based on GPS observations is applied. In order to correct the radar results on a pixel-by-pixel basis, the support vector machine（SVM） with adaptive parameters is introduced to regressively estimate tropospheric corrections over unknown points using the sparse GPS-derived corrections. The feasibility of applying SVM in tropospheric corrections estimation is examined by using data from the southern california integrated GPS network （SCIGN）. Cross-validation tests show that SVM method is more suitable to interpolate tropospheric delays than the conventional inverse distance weighted（IDW） method.

关 键 词：对流层延迟改正 雷达干涉测量 支持向量机 

分 类 号：P228.41[天文地球—大地测量学与测量工程]