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

doi:10.13474/j.cnki.11-2246.2022.0206

Abstract

Abstract: 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.

Key words: multi-track InSAR, Weibull model, priori model, mining area, 3D deformation

CLC Number:

SHI Jiancun, YANG Zefa, WU Lixin. Multi-track InSAR 3D deformation monitoring for mining areas by optimizing priori model parameters[J]. Bulletin of Surveying and Mapping, 2022, 0(7): 71-77.

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