Key Algorithms And Precision Analysis Of InSAR Monitoring In A Drilling Water-Soluble Mining Area

According to a drilling water-soluble mining mine,the sentinel-1A TOPSAR image data from December 24,2015 to August 27,2017 was selected to study the key algorithms and precision of surface subsidence monitoring in mining areas by using D-InSAR and PS-InSAR technology respectively.The main research contents of the paper were as follows:(1)By analyzing the phase contribution value of D-InSAR technology,the advantages and disadvantages of the four differential interferometry methods were compared,and DEM two-pass for D-InSAR data processing was select.In order to overcome the effects of D-InSAR technology on the incoherent and atmospheric effects,PS-InSAR technology was used for deformation monitoring.(2)Based on ENVI SARscape software platform,eight Sentinel-1A TOPSAR image data to study the key steps of D-InSAR algorithm research were selected.By Comparing with Adaptive,Boxcar and Goldstein filtered interferograms and coherence coefficient maps,an algorithm for removing noise effectively and improving interference coherence was obtained.By analyzing the phase-unwrapping result of Region Growing,Delaunay MCF and Minimum Cost Flow,an optimal phase unwrapping algorithm for solving 2? ambiguity was obtained.By analyzing the linear,automatic and orbital optimization results in refinement and re-flattening processes,the best refinement algorithm was selected.The surface deformation value of the drilling water-soluble mining area was imported into Arc GIS for mapping and statistical analysis,and the characteristics and trends of surface deformation in the water-soluble mining area were obtained.According to the actual measured level data,the data quality estimation accuracy and deformation monitoring accuracy of the D-InSAR were evaluated.(3)For the characteristics of long-term surface settlement,slow and linear deformation in water-soluble mining areas,thirty-seven sentinel-1A TOPSAR image data were selected.The double-threshold method was used to select candidate points of PS.The best coherence coefficient threshold and amplitude deviation index threshold were used to obtained the best surface deformation value and deformation rate in the water-soluble mining area.With D-InSAR results and actual measured level data compared,the accuracy of deformation monitoring of PS-InSAR is evaluated.By applying D-InSAR and PS-InSAR technology to the surface mining subsidence deformation monitoring algorithm and precision study in a drilling water-soluble mining area.It was concluded that the InSAR technology was used to monitor the surface deformation of the drilling water-soluble mining area with high sensitivity,wide coverage,all-weather,all-day and the monitoring accuracy reached centimeters or even millimeters.