优化先验模型参数的矿区多轨InSAR三维形变监测

监测煤矿开采导致的地表三维形变对于矿区地质灾害防控和开采沉陷机理研究至关重要。针对单轨道InSAR和先验模型融合解算矿山三维形变存在精度不高、时间分辨率差的问题,本文提出了一种通过优化先验模型参数的矿区多轨InSAR三维形变解算方法。首先,利用Weibull模型同步4个轨道LOS向形变位移,以此削弱不同轨道之间时间异步对三维形变解算精度的影响,并采用加权最小二乘求解矿区垂直向和东西向形变;然后,根据垂直向和东西向形变优化矿区开采先验模型参数;最后,解算南北向形变位移。利用覆盖大同矿区的TerraSAR-X数据和3个轨道Sentinel-1 InSAR数据集对本文方法进行验证。研究结果表明,与地面GPS监测点相比,本文方法可以获得相对精确的三维形变结果,垂直向RMSE、东西向RMSE和南北向RMSE约为1.1、1.4和2.1 cm。

Multi-track InSAR 3D deformation monitoring for mining areas by optimizing priori model parameters

It is crucial to measure the 3D components of ground surface deformation caused by underground coal mining, in order to control mining-related geohazards and understand mining deformation mechanism. In view of the problems of low precision and poor time resolution in the fusion of single-track InSAR and prior models to solve the three-dimensional deformation of mines, this paper proposes an multi-track InSAR 3D deformation solution method for the mine areas based on optimized priori model parameters. The method firstly uses the Weibull model to synchronize the line-of-sight(LOS) deformation displacements of the four tracks SAR datasets,thereby reducing the effect of time asynchrony between different tracks on the accuracy of the 3D deformation solution,and the weighted least squares is used to solve the vertical and east-west deformation of the mine area.Then,a priori model parameter is optimized according to the vertical and east-west displacements.Finally,the north-south displacements are solved based on the prior model.The proposed method is validated using TerraSAR-X data and three tracks Sentinel-1 datasets covering the mining area of Datong. The results show that the proposed method can obtain relatively accurate 3D deformation results (vertical,east-west and north-south RMSE are approximately 1.1,1.4 and 2.1 cm,respectively) when compared to the GPS measurements.