Study On Land Subsidence Monitoring Technology In Northwest Mining Area Based On D-INSAR

China's coal mining caused surface settlement in most parts of the mining area has been related to all aspects of our lives,attach importance to the phenomenon of ground settlement in the mining area,to achieve the geological safety of the mining area,sustainable development of the mining area is an important goal of scientific research.Therefore,there is a need for a technology capable of continuously and effectively monitoring the ground and real-time processing of data to obtain large-scale surface settlement information as a support,so as to provide reliable decision-making data for more efficient and reasonable utilization of coal resources and for warning of ground subsidence and other geological disasters.Differential Synthetic Aperture Radar Interferometry(D-InSAR)technology has the advantages of high-efficiency real-time observation,high-resolution imaging of the earth,and wide observation range,and is very suitable for applying this technology to surface deformation monitoring caused by mining.This thesis firstly elaborates the principle of InSAR interferometry and D-InSAR technology and the improvement of measurement method.On this basis,the error factors that affect the surface deformation of D-InSAR surveys are analyzed and studied.They are aimed at the temporal and spatial decoherence of SAR data,atmospheric delay,ionospheric influence on the measurement,satellite orbital deviation,and the reference digital elevation model error,etc.Study ways to reduce errors.Second,using D-InSAR technology to carry out research on the application of land subsidence monitoring,the original data,interferograms,interference filter maps,re-leveling interference phase diagrams,etc.were studied and analyzed to determine the deformation range area.Taking the He-Lan Mountain mining area in northem Ningxia as an example,this experiment collected a total of 9 Sentinel 1A satellite SAR data from October 2014 to November 2017 covering the experimental area.Through D-InSAR,mining settlement data was obtained.Finally,the D-InSAR measurement results were combined with Landsat optical remote sensing data to analyze the surface subsidence maps before and after the surface mining of the mining area and the final result of D-InSAR.The time-series optical images were used for visual analysis.The experimental results obtained from multiple sets of data processing were compared with each other for verification.After the study was concluded,the following conclusions were reached:The results of D-InSAR technology can observe the settlement of a certain ore deposit in the He-Lan Mountain mining,and obtain the settlement location and settlement range of the mine.After comparison and comparison,the experimental results are generally consistent with the actual situation.The D-InSAR measurement obtained in the study area is 71mm/240d.For the needs of safe mining and sustainable development in mining areas,using D-InSAR remote sensing measurement technology combined with multi-source remote sensing data technology of Landsat optical remote sensing imaging technology can provide rapid,large-scale and accurate data support to meet the safety and sustainable development of mining areas,etc.basic needs.