Retrieving the True 3D Displacement of the Scene Based on Multiple Ground-based Microdeformation Monitoring Radars

Abstract

The ground-based microdeformation monitoring radar system has been widely used in the field of deformation monitoring, which can perform real-time deformation and displacement monitoring of hidden disaster points in the monitoring area. Based on the principle of differential interferometry, it can only reflect the one-dimensional (1D) deformation displacement of the object point in the radar line of sight (LOS) direction. A single ground-based radar cannot accurately reflect the true deformation direction of the monitored point, that is, the main sliding direction. Therefore, in order to accurately detect the true displacement landslide direction of the hidden danger point during the monitoring process, so as to make more accurate warning predictions, it is of great significance to study and reverse the true three-dimensional (3D) deformation displacement direction of the monitoring area. In this paper, multiple ground-based radars are used to monitor the real-time displacement of the monitoring scene from different directions. By obtaining the deformation values of the same monitoring point of the multiple radars and the unit vector parameters of the LOS to construct the spatial 3D monitoring geometry, and the least squares overdetermined equations are used to solve the real 3D deformation displacement of the monitored point, which reduces the influence of the measurement error on the deformation inversion results. Based on the field measurement data, the effectiveness of the method proposed in this paper is verified, and the robustness and accuracy of the 3D deformation measurement are improved.