摘要
经过一年多的在轨测试,我国第一组民用差分干涉SAR卫星,L波段差分干涉SAR(也称“陆探一号”)经过了各系统联合调整,已经具备了较好的在轨运行条件。本文对部分在轨应用关键参数进行了测试分析。测试结果表明,卫星的长期平面定位精度优于3.9 m。河南省及江苏省的检校和验证数据表明,检校前、检校后以及平差后的DSM中误差分别优于13.2、6.3、2.9 m。卫星具有3种形变产品,即差分干涉技术获取的形变场、不计高程改正误差参数估计的初级多时相回归堆叠技术获取的低精度形变速率场,以及顾及高程改正误差参数估计的精细多时相回归技术获取的高精度形变速率场与形变累计序列。山西省大同市的形变场产品与同期水准对比表明,三者的中误差分别优于2.7 mm、8.6 mm/a、3.7 mm。同时本文进行了严格回归轨道控制半径的测试,测试结果表明,90%的值小于323 m。本文同时进行了相干性的评估,在不考虑时间相干性的前提下,整体相干性优于0.7。在轨测试结果表明,陆探一号卫星已经具备了较好的运行条件,可提供给各用户开展广泛应用。
After one year in-orbit test of the China s first L-Band differential interferometric SAR(L-SAR)satellite,which is also named as LuTan-1,we finally conclude that the satellite has reached the pre-defined accuracies.In this paper,we analyzed the key technologies that related to the parameters of the quantitative applications.Three kinds of parameters belonging the long-time geolocation capacity,the digital surface model(DSM)accuracy,as well as the deformation products accuracy are introduced.Results show that the geolocation error of L-SAR is within 3.9 m.We obtained the DSM calibration and validation data in Henan and Jiangsu Provinces.DSM accuracies before interferometric calibration,after calibration and after least square estimation are 13.2,6.3 and 2.9 m,respectively.We have defined three kinds of deformation products,i.e.,deformation products generated using differential InSAR,stacking and multi-temporal InSAR.Accuracies of the three deformation products obtained in Datong of Shanxi Province are 2.7 mm,8.6 mm/a and 3.7 mm,respectively.Meanwhile,90%of the strict regression orbit radius was tested to be smaller than 323 m.The components of the decoherence sources were discussed.Final coherence before filtering is better than 0.7 when ignoring the temporal decoherence.The in-orbit test result is encouraging and the satellite will be widely used after its delivery from satellite producers to the users.
作者
唐新明
李涛
张祥
周晓青
禄競
张雪飞
TANG Xinming;LI Tao;ZHANG Xiang;ZHOU Xiaoqing;LU Jing;ZHANG Xuefei(Land Satellite Remote Sensing Application Center,Ministry of Natural Resources of P.R.China,Beijing 100048,China)
出处
《测绘学报》
EI
CSCD
北大核心
2024年第10期1863-1872,共10页
Acta Geodaetica et Cartographica Sinica
基金
国家重点研发计划(2021YFC3000405,2023YFB3904905)
国家自然科学基金(42301160)。
