High-precision surface deformation monitoring system with GPS in mining area

In view of the variability of mine surfaces,global positioning system(GPS)technique is employed to establish the dynamic deformation monitoring system in mine area.Based on the productive practice in two coal mines,basic procedures of the system and detailed process of data processing are presented in order to verify the possibility of high-precision subsidence monitoring in mining area with GPS.High-precision 3DGPS control network and quasi-geoid model are constructed to offer the technical support for quickly acquiring the high-precision normal height and integrating the multi-source deformation data in mining area.Based on the deformation data measured by GPS,the surface movement and displacement law,surface movement parameters and shaft tower deformation can be obtained,showing the effectiveness of the monitoring system.