Three-dimensional deformation estimation method for high temporal and spatial resolution at mining area surface

Abstract

The present invention discloses a three-dimensional deformation estimation method for high temporal and spatial resolution at a mining area surface. The method comprises: separately forming each orbital SAR data into a set of InSAR interference pairs; then obtaining a monitoring data set from one-dimensional radar line of sight to multi-temporal deformation at the mining area surface; jointly solving the monitoring data set from one-dimensional radar line of sight to multi-temporal deformation at the mining area surface and a prior model for a linear proportional relationship between horizontal movement caused by mining subsidence and subsidence gradient to obtain a three-dimensional multi-temporal deformation observation field along vertical, west-east and north-south directions of the mining area surface; establishing an observation equation for a three-dimensional deformation rate during time-adjacent SAR images in a multi-track SAR image data set and the three-dimensional multi-temporal deformation observation field; and solving the observation equation to obtain a three-dimensional deformation of high temporal and spatial resolution at the mining area surface. The present invention overcomes the stringent requirements and limitations for observation measurement and observation geometry in a traditional InSAR three-dimensional deformation estimation method; the time resolution of a monitoring result is obviously improved, and a more accurate result is obtained.

Description

technical field [0001] The invention belongs to the technical field of mining area measurement, and in particular relates to a method for estimating three-dimensional deformation of mining area surface with high temporal and spatial resolution based on a priori model of mining subsidence. Background technique [0002] The three-dimensional deformation monitoring of mining area surface with high temporal and spatial resolution plays an important role in understanding the dynamic mechanism of mining subsidence in mining area, disaster prevention and accurate assessment in mining area. Synthetic aperture radar interferometry (Interferometric Synthetic Aperture Radar, InSAR) technology plays a huge role in the monitoring and prediction of surface deformation in mining areas due to its high spatial resolution, high precision, and no interference from cloud and rain. However, the deformation monitored by InSAR technology is the one-dimensional projection of the real three-dimensio...

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Problems solved by technology

2) Since most of the mining areas are located in rural areas and suburbs, the surface cover usually changes greatly, and the surface deformation rate is relatively fast, making it difficult to obtain time-series deformation results of the mining area based on single-track InSAR data

Especially when there is a time gap in the single-track data set, it will be difficult to obtain highly nonlinear time-series deformation results of the mining area using the traditional least squares-based algorithm

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