Application Of Timing Series SAR Technology In Deformation Monitoring Of Mining Area

Coal is an important basic energy in china,and its reserves rank third in the world.The utilization of coal resources occupies an absolute dominant position in the proportion of China’s energy utilization.On the one hand,high intensity mining of coal resources can provide energy support for China’s infrastructure and economic development,on the other hand,it also brings severe challenges to the ecological environment of mining area.The exploitation of coal resources with high intensity leads to serious ecological environment problems,for example,the mining area is increasing and even some large mining subsidence area is existent.Therefore,the real-time dynamic monitoring of mining subsidence is very important to solve the environmental problems.The conventional monitoring technology can meet the requirements of mining subsidence monitoring to a certain extent,but there are also many problems such as high labor intensity and low efficiency.The emerging DIn SAR technology has the ability to obtain large area subsidence of all-weather and all-time operations,and its accuracy of observation is up to centimeter or even millimeter,however,due to the influence of uncorrelation between time and space baseline and atmospheric delay,the measurement accuracy of this technology is limited and its application in long term deformation monitoring is restricted.Advanced timing SAR technique can overcome those problems and obtain the ground deformation of high resolution,high precision and long time series,it has great application prospect in the subsidence monitoring of mining area.This paper mainly uses Stacking technology,Sta MPS technology,Sta MPS/MTI technology to monitor the land subsidence in mining area,the main research work and achievements are as follows:(1)According to the time baseline,the perpendicular baseline and the frequency baseline,an integrated coherence coefficient model is constructed to select the master image of the Sta MPS technique;Sta MPS technology is used to deal with the 12 scene ALOS satellite images in the area of Pei Bei,the settlement rate and time series change of the study area are analyzed;This paper points out the problems existing in the Sta MPS technology using ALOS satellite images and the applicability of the technology in monitoring the coal mining subsidence area.(2)Sta MPS,Stacking,Sta MPS/MTI three timing techniques are used to deal with the 13 scenes Terra SAR data.The influence of the DEM residual phase,the phase error of satellite orbit and the atmospheric delay phase on the monitoring results obtained by Sta MPS/MTI technology is analyzed.The settlement rate,time series change and cumulative settlement value obtained by three kinds of time series techniques are used to be compared,Finally,it is found that the Sta MPS/MTI technology has more advantages in monitoring the land subsidence.(3)The settlement rate,the cumulative value obtained by Sta MPS/MTI technology is used to analysis the surface subsidence in mining area.4 observation points are extracted in 2310 working face of the mining area with the interval of 100 m,it is found that the settlement value varies linearly with time through the analysis of the change characteristics of settlement value with time.The observation points are set up in the trending and orientation of the working face,the settlement law of each working face in the trending and the orientation is analyzed by extracting the timing sequence accumulated value of the observation points.