Research On Surface Subsidence Monitoring Of Coal Mining Area Based On InSAR Technology

China has abundant of mineral resources, especially in coal resources, but with the large-scale exploitation of coal resources a variety of Eco- environmental problems has ensued.Especially the negative effects of surface subsidence caused by mining have become increasingly serious.Therefore, strengthening the subsidence monitoring of mining area, access to the settlement information of mining and prevent collapse of the mining subsidence appears increasingly urgent. Interferometric Synthetic Aperture Radar(In SAR) is a new space to earth observation method, which is different from the traditional monitoring methods, with the feature of all-weather, all-day, high-precision(mm), a broad area high degree of automation etc., to make up for the shortcomings of conventional monitoring methods, and has broad prospects in the mining subsidence monitoring.Conventional methods to get the time-series differential interferograms of coal mine are SBAS technology and PS technology. But they both require post-processing the data of D-In SAR technology to get the time-series settlement deformation.This paper puts forward the concept of time-series differential interferograms technology which based on time-series differential interferograms to extract continuous cumulative settlement deformation figure and sequential mining area.To take some coal mine of Jiang Xi province for example, this article adopts advanced D-In SAR technology—SBAS technology and time-series differential interferograms technology to monitor ground subsidence of mining to prove the feasibility of time-series differential interferograms technology. The main researching contents include:(1)This article discusses the basic principles and the processes of In SAR、D-In SAR and SBAS technology;(2)Using the method of time-series differential interferograms technology to extract time-series differential interferograms from 2007.6.14 to 2008.3.17 day based on seven covering mines’ L-band ALOS PALSAR images;(3) This article adopts advanced D-In SAR technology—SBAS technology to monitor ground subsidence of mining to extract continuous cumulative settlement deformation figure and time-series interferograms of mine at the same time and compare the result with time-series differential interferograms technology.