Comparison and Evaluation on Accuracy in Satellite InSAR DEM Derived Using Coarse and Precise Orbit Data
粗／精轨道数据对卫星InSAR DEM精度影响的对比分析

This paper first introduces the interpolation technique of satellite orbit state vectors in the synthetic aperture radar interferometry(InSAR) system.From both the theoretical and practical viewpoint,we then discuss and analyze the influence of orbit data errors on the accuracy of the reference phase,the topographic phase,and the resulting digital elevation model(DEM).Selecting a part area of Shanghai as the testing site,the experiment of interferometric processing and DEM generation is performed using the satellite ERS-1/2 SAR images as well as the coarse and precise orbit data provided by European Space Agency(ESA) and Delft Institute for Earth-Oriented Space Research(DEOS),respectively.Comparison and analysis on the relevant accuracies are thus made for the two types of orbit data.The results show that the accuracy in the DEM generated with precise orbit data is prominently higher than that with coarse orbit data.