摘要
针对粗差对多源InSAR数据三维地表形变解算的影响,提出一种基于多视线向D-InSAR技术的三维地表形变抗差解算方法。该方法利用多视线向D-InSAR地表形变监测数据,在最小二乘原则的基础上实现InSAR三维地表形变解算,获取平差观测量的残差,建立最小二乘残差与观测量单位权方差的函数关系,并通过计算出的单位权方差对InSAR地表形变观测量进行定权;基于等价权原理,选用IGGⅢ权函数实现三维地表形变的抗差解算。最后,以2009年意大利拉奎拉地区地震为例,对该解算方法的可行性和精度进行验证。结果表明,该方法可以获取可靠的解算结果。
Considering the influence of gross error on three-dimensional surface deformation based on multi-LOS D-InSAR technology,ascribing gross errors to random model,we propose a method of the robust estimation of the three-dimensional surface deformation.We calculate the three-dimensional deformation using the least square method,and pre-residuals of measurements are obtained.Then,we establish the function between the least squares residuals and the unit weight variance.The weight of InSAR measurements are calculated from the unit weight variance.Based on the equivalent weight principle of the weighted iteration method,we process the robust estimation of the three-dimensional surface deformation using IGGⅢweight function.We verify the feasibility and precision of the proposed method in a real data experiment based on the case of 2009 L’Aquila earthquake.The verification results show that the proposed robust estimation of 3-D surface deformation can effectively eliminate the influence of the gross error.
作者
周立新
王志伟
ZHOU Lixin;WANG Zhiwei(Shandong Institute of Geophysical and Geochemical Exploration,56 Lishan Road,Ji’nan 250014,China;College of Surveying and Geo-Informatics,Shandong Jianzhu University,1000 Fengming Road,Ji’nan 250101,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2020年第12期1263-1267,共5页
Journal of Geodesy and Geodynamics
基金
山东建筑大学博士科研启动基金(X18097Z)。