The Application Of InSAR Technique On Surface Deformation Monitoring In Mountainous Area

In recent years,synthetic Aperture Radar(SAR)has become a hotspot in monitoring surface deformation.However,Synthetic aperture radar interometry(InSAR)technology is more research on surface deformation monitoring in urban areas,less research on surface deformation monitoring in coal mines of complex mountainous areas.Studying on mountainous areas by InSAR technology,not only can analyze the characteristics of surface deformation of coal mines in mountainous areas,but also has important significance to the study on the law of mining subsidence in mountainous areas and ground protection.In this paper,InSAR technique is used to monitor the ground deformation caused by coal mining in mountainous area.The main work and contents are as follows:(1)Using three kinds of DEM data to process the ground surface SAR image of mountainous area by using the two-pass D-InSAR method.The results showed that the absolute error of the 10 m resolution DEM data processed from the 1: 5000 topographic map?30m and 90 m is 22.19 mm?33.57 mm and 33.92 mm on average.It shows that the high resolution DEM data have higher accuracy in complex terrain processing use the two-pass D-InSAR method.(2)Using two-pass method D-InSAR to process the SAR images of the mountainous area,and get the time series deformation map of the surface of the working face to;Using probability integral method to verify the time series deformation results of two-pass D-InSAR method,and overlay analysis of-50 mm deformation contour extracted by two methods is processed by Arc GIS.The results shows that the-50 mm deformation contour obtained from SAR image inversion has a high consistency to that simulated by probability integral method in the northeast area;Combined with actual speed of working face advance,extract advanced angle of influence and boundary angle parameters from the result of two-pass D-InSAR and PSInSAR.(3)Four measuring points of surface mobile observation stations were selected,and the results of SBAS technology were compared with the measured data of the observation station at 4 points.The results showed that the consistent in time and space,thus indicating the feasibility of the time sequence SBAS technology in monitoring the surface deformation of goaf.(4)Surface deformation law over three goaf is analyzed by SBAS method.The results shows that the surface above the goaf is affected by the mining of adjacent working face and prolong the decline phase of mining subsidence;at the same time,the study area are influenced by mountains complex terrain,mountainous valleys of the earth's surface or strata in mining horizontal compression deformation and the stress under the action of lateral will occur additional rise,displayed on the image of the surface uplift.