Method for obtaining mining area earth surface three-dimensional deformation fields through single interferometric synthetic aperture radar (InSAR) interference pair

Abstract

The invention discloses a method for obtaining mining area earth surface three-dimensional deformation fields through a single interferometric synthetic aperture radar (InSAR) interference pair. The method includes that a mining field radar sight deformation field is obtained through an InSAR technology, pixels with coherence which is lower than an unwrapping threshold value in the sight deformation field is subjected to spatial interpolation to obtain a spatial continuous deformation field, main effective radius of each pixel is calculated through mining area working face distribution and main effective angles, after mining area horizontal shifting coefficients are obtained, the mining area earth surface horizontal shifting is converted to an expression of a sinking value, an equation set is formed according to the radar imaging principle, the equation set is solved to obtain a solution of the earth surface sinking value, according to the sinking value, tilting values of east, west, south and north directions are calculated, and the deformation fields of the east, west, south and north directions are calculated according to a proportional relation among the tilting values of the east, west, south and north directions and the horizontal shifting. The method has the advantages that the restrictions that when the three-dimensional deformation field is solved by the aid of the InSAR, the requirements for data are strict, the monitoring cost is high and the like are broken, and the application space of the InSAR technology in the mining area is greatly widened.

Description

technical field [0001] The invention relates to a method for obtaining the three-dimensional deformation field of the mining area surface by using a single InSAR interference pair. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) is a new type of surface deformation monitoring technology developed in the 1990s. The satellite image is subjected to differential interference processing, and centimeter or even millimeter-level radar line-of-sight deformation values ​​are extracted from the phase difference. Compared with the traditional geodetic technology, InSAR has the advantages of all-weather, continuous space coverage, high precision, and low cost. However, the traditional InSAR technology can only monitor the one-dimensional deformation in the direction of the radar line of sight. Since it only obtains the deformation field in one direction, it cannot meet the requirements of the three-dimensional surface deformation required for mining contr...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for acquiring the three-dimensional deformation field of the surface of the mining area by using a single InSAR interferometric pair, which overcomes the defects of the existing method for obtaining the three-dimensional deformation of the surface of the mining area, such as high observation cost, harsh data requirements, and low observation accuracy.

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