基于精细DEM的InSAR大气相位改正试验研究  

Experimental study of atmospheric phase correction on InSAR with high-resolution DEM

作　　者：李曼[1] 夏耶[1,2] 葛大庆[1] 张玲[1] 范景辉[1] 王艳[1] 

机构地区：[1]中国国土资源航空物探遥感中心,北京100083 [2]德国地球科学研究中心,波茨坦14473

出　　处：《国土资源遥感》2013年第2期101-106,共6页Remote Sensing for Land & Resources

基　　金：国际科技交流与合作专项项目"重大工程区地表形变高分辨率星载干涉SAR监测关键技术合作研究"(编号:2010DFB23380);航遥青年创新基金项目"升降轨PSInSAR技术地表形变测量方法研究"(编号:2010YFL11)共同资助

摘　　要：大气波动严重地制约了传统D-InSAR技术在缓变形滑坡体形变监测中的应用。为此,针对树坪滑坡区特殊的地理位置、复杂的地形地貌特征以及多雨潮湿的气候条件,通过分析湿延迟相位随高程变化的空间分布特征,分别建立了空间局部区域内大气效应与相应高程之间的最优函数校正模型,将模拟的湿延迟相位从解缠相位中去除,最终恢复出树坪滑坡体的形变场。试验结果表明,该方法显著地降低了干涉图中的湿延迟相位,清楚地框出了树坪滑坡体形变场在11d中的位置、大小及其分布情况,这对三峡库区缓变形滑坡体的全面监测具有重要意义。The most important limiting factor is probably the strong atmospheric wet delay in the application of InSAR to monitoring those landslides located in special location complex topography and rainy climatic condition areas, such as Shuping landslide in Three Gorges Area in China. The atmospheric delay phase could even cover its deformation phase in the area of Shuping landslide at times. To overcome this default of D - InSAR, the authors carried out a correction by the correlation between wet delay phase and elevation, which probably is a considerable atmospheric correction method. Therefore, based on space partial correlation, this paper established the best - fit - function model between wet delay phase and corresponding DEM in the area of Shuping landslide. In fact, wet delay is closely related not only to the elevation but also to the distance along the radar in some cases. In Fig. 1 the function of ＇ I ＇ zone depends on the elevation, while that of ＇ Ⅱ ＇ zone is a function of both the elevation and the X （range direction）. In view of the least- square method, two best- fit- function models would be found under the condition of the minimum mean square deviation without obvious variation. Finally, the simulated atmospheric delay phase formed by optimal correction models with elevation or/and distance values is removed from the unwrapping phase. And it clearly gives the result of the location, the size and the distribution of the Shuping deformation field within the 11 days. In conclusion, this method could effectively reduce the wet delay phase of the interferogram and is of significance for monitoring the slow deformation of landslides in the Three Gorges Area.

关 键 词：湿延迟 DEM 树坪滑坡 最优函数校正模型 形变场 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]