Research On Extraction Method Of Surface Deformation In Mining Area Based On SBAS-InSAR Technology

The continuous exploitation of coal resources has led to the mining area on the ground / lower geological structure changes,rapid surface subsidence and a series of geological disasters,resulting in damage to the urban infrastructure such as buildings(roads),roads and pipelines,and deterioration of the surrounding ecological environment,which has seriously affected the natural conditions and the subsequent use of the mining areas,and has brought adverse effects to these mining city's economic and social development and ecological environment.Therefore,it is of great significance to ensure the sustainable development of mining area and mine cities that comprehensive,real-time grasp of mine surface deformation,the formation of a scientific and effective surface deformation control technology system.It is difficult to quickly grasp the problem of the overall deformation of the mining area in the mining area,and the D-InSAR technology can make up for the shortcomings of the conventional measurement method,but because of its own time and space,it is difficult to quickly grasp the surface deformation of the mining area,(Small Baseline Subset,SBAS-InSAR)technology can use less SAR data,effectively overcome the influence of the coherence factor,get accurate timing deformation and deformation rate,in a wide range of the range of the same time,In this paper,based on the SBAS-InSAR technique,the Sentinel 1A data are used to monitor the surface deformation of the mining area,and the results are compared with the D-InSAR monitoring results,and the following results are obtained.1.Based on the analysis of D-InSAR technology error source and limitation,the theory and algorithm model based on small-baseline technology is studied,and the D-InSAR technique is used to obtain the spatial distribution of surface deformation,The results consistent with the actual situation.2.Based on the analysis of the spatial distribution of surface subsidence in the mining area,SBS technique was used to process 15 SAR data in the experimental area,and the surface deformation rate and time series deformation of November 1998 to November 2016 were The surface of the test area to change the precise monitoring results.The results show that the maximum cumulative settlement in the center of the sedimentation funnel is more than 50 mm,the settling rate is 75 mm / y,and the accumulative settlement of the funnel is 10 mm.3.By comparing the D-InSAR and SBAS-InSAR monitoring results,it is found that the experimental area is consistent with the overall deformation.The surface subsidence occurs in the mining area,and the deformation results of the two methods are compared under the unified time and spatial scale,The deformation spatial distribution and deformation are consistent.The experimental results show the effectiveness of SBAS-InSAR technology for large-scale surface deformation monitoring,and also verify the applicability of Sentinel 1A data in surface deformation monitoring of large-scale mining area.