期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B7
页码：83-86
出版社：Copernicus Publications
摘要：Both InSAR and GPS can detect tropospheric delay of radar beam propagation caused by water vapour fluctuation. What InSAR detected is the differential results of two SAR images taken at two epochs whose spatial resolution can be tens of meters. GPS can continuously detect tropospheric delay above the station and average the final results into zenith direction. But as GPS stations spans tens of kilometres, the final interpolated tropospheric delay in space is very poor and it depends on the distribution of GPS stations. This paper studied the tropospheric delay on Tandem interferogram in Tianjin area. Using surface fitting method in baseline error correcting, both the baseline error and the whole scene tropospheric delay were suppressed. Meanwhile, 13 GPS continuous operating stations in Tianjin were used to calculate the zenith delay over each station. GAMMIT software is used to get the zenith delay according to the Tandem SAR image acquiring season and epoch. The spline method was used to interpolate the zenith delay to the SAR image area and corresponding results were helpful to mitigate the tropospheric delay on Tandem interferogram. This study shows that GPS zenith delay may be useful to mitigate the tropospheric delay in InSAR
