Study On The Ground Subsidence Monitoring In Peibei Mining Area With InSAR Technology

Coal is one of the most important energy in our country.Exploiting a large number of coal brings huge economic benefits to the development of the society,at the same time,it also caused problems such as ground collapse. How to monitor ground subsidence caused by coal mining effectively has become the important topic which researchers focus on.The thesis is supported by public welfare project National geographic information industry and natural science foundation of China.It combines work target of collaborative innovation center for resource utilization and ecological restoration of old industrial base and works hard to do the research on groud subsidence monitoring of Peibei mining area.Aims at problems of decorrelation phenomenon caused by large deformation,the thesis uses Stacking-InSAR to monitor deformation of large magnitude and uses PS-In SAR to monitor the edge of groud subsidence.It fuses results of two methods and successful generates complete results of Peibei mining area.The main work and achievements are as follows:(1)The princeple of InSAR is discussed.It analyzes the model of InSAR elevation measurement.It deduces deformation phase, reference phase and topography pahse from components of phases.It introduces different methods of D-InSAR,analyzes advatages and disadvantages of D-InSAR using 2-pass D-InSAR as an example.(2)The key technology of InSAR is analyzed from maximum monitored deformation magnitude,image registration and substraction of topography phase.It deduces that PALSAR data which is L band can detect larger magtitude comparing with ASAR data.It uses data generated in winter and summer to do the comparing,improve correlation from the selection of data.It uses offset tracking method to register images instead of conventional methods,improves the accuracy of registration,uses example to show the accuary raises 0.1~0.15 pixel.It uses SRTM3 DEM and ASTER GDEM to substract the topography and finds that more accurate when using SRTM3 DEM.(3)The thesis does research on basic principle and working process of PS-InSAR and Stacking-InSAR.It analyzes key technology of PS-InSAR from master image selection and PS points detection.PS-InSAR and Stacking-InSAR are used to process experimental data.It generates deformation information of study area.The mean subsidence velocity distributes between-78~12mm/a of PS-InSAR.The mean subsidence velocity distributes between-1.4~0.4 m/a of Stacking-InSAR.It successfully generates deformation of meter magnitude using Stacking-InSAR and gives a better way on monitoring of large magnitude deformation in center of ground subsidence.(4)It analyzes advantages and disadvantages of PS-InSAR and Stacking-InSAR, takes full consideration on the characteristics of Peibei mining area,raises that using the fusion of PS-InSAR and Stacking-InSAR to monitor the ground subsidence of Peibei mining area.It uses Stacking-InSAR to generate center of ground subsidence and uses PS-InSAR to generate edge of ground subsidence to supplement the result of Stacking-InSAR.Then,the complete result is generated.