ALOS PALSAR雷达影像InSAR数据处理中的基线和地形误差分析  

ERROR ANALYSIS OF BASELINE AND TERRAIN IN InSAR DATA PROCESSING USING ALOS PALSAR

作　　者：沈强[1] 乔学军[2] 金银龙[3] 汪汉胜[1] 江利明[1] 

机构地区：[1]中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,武汉430077 [2]中国地震局地震研究所,武汉430071 [3]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《大地测量与地球动力学》2012年第2期1-6,共6页Journal of Geodesy and Geodynamics

基　　金：水资源与水电工程科学国家重点实验室开放基金(2009B054);国家自然科学基金(41004008;40825012);冰冻圈国家重点实验室开放基金(SKLCS 09-03)

摘　　要：从理论上分析了InSAR处理中的两大误差源——基线和地形对形变测量精度的影响,并建立了评价模型。在此基础上,研究了上述两种误差源对ALOS PALSAR的影响,获取了两种误差对形变影响的空间分布特征。结果表明,ALOS PALSAR的轨道精度为3～5 m,在现有的轨道精度情况下,形变测量精度较差,需对基线误差进行纠正;地形误差的影响很小,主要误差源于轨道误差。在现有DEM精度条件下(SRTM DEM),利用ALOS PALSAR,要获得优于1cm的形变测量精度,基线长度最好小于400 m。Seeing that there are still many factors governing the accuracy of InSAR although they have appeared to good application in various field as earthquake, landslide, etc. this paper focus on the two sources of errors con- trolling the accuracy of InSAR. In the first place, theoretical analysis has been first made for the evaluation of influ- ence of baseline and terrains errors on surface deformation. On the basis of above theoretical analysis, we estimated the influence of baseline errors and terrain errors on InSAR for ALOS PALSAR radar images without accurate orbit information. The spatial patterns of additional surface deformation due to the two error sources have also been re- trieved. The results show that the orbit accuracy of ALOS PALSAR is 3 - 5 m, in which the displacements must be rectified for the low orbit accuracy. The simulation and experimentation all show that baseline is main error sources in the use of ALOS PALSAR and terrain errors is negligible. For the accuracy of better than 1.cm in deformation measurements, the length of baseline must be less than 400 m under current SRTM DEM if two-pass interferometry was used.

关 键 词：ALOS PALSAR INSAR 基线误差 地形误差 基线长 

分 类 号：P227[天文地球—大地测量学与测量工程]