阿尔金断裂带宽幅InSAR对流层延迟估计方法评估  

Evaluation of Wide-Swath InSAR Tropospheric Delay Estimation Methods over the Altyn Tagh Fault

作　　者：李鹏[1,2] 高梦瑶 李振洪 王厚杰 LI Peng;GAO Mengyao;LI Zhenhong;WANG Houjie(Key Lab of Submarine Geosciences and Prospecting Technology,College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Laboratory of Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;School of Engineering,Newcastle University,Newcastle upon Tyne NE17RU,UK;College of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China)

机构地区：[1]中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室,山东青岛266100 [2]青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室,山东青岛266061 [3]武汉大学测绘学院,湖北武汉430079 [4]英国纽卡斯尔大学工程学院,英国纽卡斯尔NE17RU [5]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《武汉大学学报（信息科学版）》2020年第6期879-887,共9页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41806108);国家重点研发计划(2017YFE0133500,2016YFA0600903);山东省自然科学基金(ZR2016DB30);中国博士后科学基金(2016M592248);中央高校基本科研业务费专项资金(201713039);青岛市自主创新计划应用基础研究项目(16-5-1-25-jch);青岛市博士后人员应用研究项目。

摘　　要：近年来,宽幅合成孔径雷达干涉测量(interferometric synthetic aperture radar,InSAR)技术已被广泛用于地质灾害普查、地壳形变监测等方面,但对流层相位延迟影响极大限制了大范围、缓慢构造形变监测的精度。以覆盖地形起伏强烈的阿尔金断裂带西段的两类宽幅InSAR时间序列为例,分析了欧洲中期天气预报中心(European Centre for Medium-Range Weather Forecasts,ECMWF)、InSAR通用型大气改正在线服务(generic atmospheric correction online service for InSAR,GACOS)、地形相关线性模型这3类方法对大尺度对流层延迟的改正效果。结果表明,经GACOS改正后的Envisat ASAR与Sentinel-1宽幅InSAR干涉图序列的相位标准差均值削减量分别可达68.1%和54.5%,整体优于ECMWF和地形相关线性改正方法,能够为国内外InSAR用户开展宽幅InSAR大范围地质灾害监测等应用提供关键可靠的支持。In recent years,wide-swath(WS)interferometric synthetic aperture radar(InSAR)technique that has the potential to produce continental-scale maps has been widely used in geological disaster survey and crustal deformation monitoring.However,the impact of tropospheric delay greatly limits its accuracy in mapping small amounts of ground deformation over large spatial areas.Three common used methods,that is ECMWF(European Centre for Medium-Range Weather Forecasts),GACOS(generic atmospheric correction online service for InSAR)and topography-correlated linear relationship,are evaluated to investigate their statistical performance with WS InSAR time series derived from Envisat ASAR ScanSAR and Sentinel-1 TOPOSAR modes over the western segment of the Altyn Tagh Fault.The results show that the GACOS correction method is superior to the other two methods and performs best in capturing both topography-correlated and turbulent mixing tropospheric delays.For Envisat ASAR and Sentinel-1 datasets,the mean reduction of phase standard deviation after GACOS correction can reach 68.1%and 54.5%respectively.The linear correction method can perform relatively well in large-scale areas with rough topography when vertical atmospheric stratification dominates the tropospheric delay.Due to a lack of ground meteorological observation,ECMWF products with limited spatial and temporal resolution cannot accurately reveal the local details.As a fast,robust and effective online service for tropospheric delay estimation and correction,GACOS products can provide critical and reliable support for global InSAR users in largescale geological disaster applications.

关 键 词：INSAR 对流层延迟 InSAR通用型大气改正在线服务 地形相关分量 阿尔金断裂带 

分 类 号：P237[天文地球—摄影测量与遥感]