Research On PS-DInSAR Monitoring Methods For Mine Surface Subsidence

Mining trigger surface subsidence,even leads to region disasters such as ground fissure, collapses and pitfalls which severely endangers the safety in production,and brings about a series of questions in ecological environment aspect.It is highly significant for mine sustainable development to monitor and analyse land subsidence which leaded by mining, definite range and realize macroscopic subsidence of subsidence.It also could provides a basis for comprehensive treatment of subsidence area.The most commonly used methods of monitoring land subsidence are leveling,GPS,measuring robot and geotechnical engineering sensors and so on. These methods each have their own characters,which monitoring characteristic points and line to obtain state deformation of study region through data processing and analysising.But,it is highly cost for macroscopic monitoring land subsidence in the large.The development of InSAR technique provide approaches for dissolved of these problems.D-InSAR techniques detectes the tiny changes in the surface and in widespread use because of its advantages, such as relable accuracy, larger coverage range. PS-InSAR techniques solve the problems facing the application of DInSAR techniques, such as low coherence, signal delay caused by atmospheric. By means of which human fix up or look for permanent scatters points on the ground, analyse phase interference of permanent scatters points in a way of time series.After remove the terrain information and noise information,we can get deformation rate,data of signal delaycaused by atmospheric and DEM errors of PS points. Precision of PS-InSAR technique detect deformation rate is millimetre level.Currently, the research of InSAR technique focuses on urban, little focuses on mine land subsidence.The paper has a preliminary research on PS-DInSAR monitoring methods for mine surface subsidence. Paper analyzes necessity and present situation of mine land subsidence monitoring,and defines experimental program of using PS-DInSAR to monitor land subsidence. According to experimental program, firstly,pre-treatment are necessary,mainly consist of data preparation,format transformation,coordinate transformation and DEM data interpolation,proivding a base for subsequent geocoding and data management.Then processed SAR data by means of DInSAR,PS-InSAR, obtained horizontal and vertical displacement map, compared data processing results of COSMO with GPS realize data. Finally, Imported SLC,DEM,SAR data into ArcGIS, proivding a base for SAR data goes into the database and Integration analysis of multi-monitoring information.Through applied research for 8 SAR data in study area, approaches to the Treatment of improvement Image registration accuracy and phase unwrapping efficiency, analyses the influence of different parameters for results of data processing,gets horizontal and vertical displacement map of study area, actualizes management and overlay analysis of SAR data in GIS environment. The method and flowsheet of data processing have certain experience to monitoring land subsidence and integration analysis.With great potential and promising prospect, InSAR technology is widely used in monitoring land subsidence fields, With the development of hardware, software, processing algorithms, and rich SAR resources, we could see that the application of InSAR technology on deformation monitoring will be more extensive.