Design Bistatic Interferometric DEM Generation Algorithm and Its Theoretical Accuracy Analysis for LuTan-1 Satellites  

作　　者：Bing XU Liqun LIU Zhiwei LI Yan ZHU Jingxin HOU Wenxiang MAO 

机构地区：[1]School of Geoscience and Info-Physics,Central South University,Changsha 410083,China

出　　处：《Journal of Geodesy and Geoinformation Science》2022年第1期25-38,共14页测绘学报（英文版）

基　　金：National Science Fund for Distinguished Young Scholars(No.41925016);National Natural Science Foundation of China(No.41804008);National Key Research and Development Program of China(No.2018YFC1503603)。

摘　　要：LuTan-1(LT-1)is a constellation with two full-polarization L-band radar satellites designed by China,and the first satellite was scheduled to be launched in December 2021 and the second one in January 2022.The LT-1 will be operated for deformation monitoring in repeat-pass mode,and for DEM generation in bistatic mode,improving self-sufficiency of SAR data for the field of geology,earthquake,disaster reduction,geomatics,forestry and so on.In this paper,we focused on designing an algorithm for interferometric DEM generation using LT-1 bistatic satellites.The basic principle,main error sources and errors control of the DEM generation algorithm of LT-1 were systematically analyzed.The experiment results demonstrated that:①The implemented algorithm had rigorous resolution with a theoretic accuracy better than 0.03 m for DEM generation.②The errors in satellite velocity and Doppler centroid had no obvious effect on DEM accuracy and they could be neglected.While the errors in position,baseline,slant range and interferometric phase had a significant effect on DEM accuracy.And the DEM error caused by baseline error was dominated,followed by the slant range error,interferometric phase error and satellite position error.③To obtain an expected DEM accuracy of 2 m,the baseline error must be strictly controlled and its accuracy shall be 1.0 mm or better for Cross-Track and Normal-Direction component,respectively.And the slant range error and interferometric phase error shall be reasonably controlled.The research results were of great significance for accurately grasping the accuracy of LT-1 data products and their errors control,and could provide a scientific auxiliary basis for LT-1 in promoting global SAR technology progress and the generation of high-precision basic geographic data.

关 键 词：Synthetic Aperture Radar bistatic InSAR LuTan-1 Digital Elevation Model(DEM) baseline error 

分 类 号：P237[天文地球—摄影测量与遥感]