Study on the Subsidence Monitoring in Industrial and Mine Area Based on D-INSAR

摘要

The data of ENVISAT radar in the subsidence and deformation caused by mining are studied by means of three pass method, aiming at the research object of Dayan Minefield, Inner Mongolia, for the sake of landform monitoring in largesize minefields rapidly and effectively. The emphases of the paper is the phase unwrap using minimum cost flow algorithm, and the advantages and disadvantages in processing is also analyzed, in which the matching offset points meeting the requirements are achieved by enlarging the search window, and the polynomial coefficients are also calculated, so that the landform and the deformation interference patterns are obtained by resampling from the images for the complex number, matching of master image with the resampling images, filtering, flattening, unwrapping and so on. The result of experiment indicates that the measuring precision of D-INSAR technique itself can reach mm level and can accurately reflect the actual positions and the sinking speed of subsidence in the minefield.