Application Of Multi-temporal InSAR In Deformation Monitoring Of Xi’an Metro

In today’s era of Rapid Development,it has promoted,Dill Rapidos Bilppo del Transit Rio Urbano Railway,ESPEC,ially the development of the transportation of the subway.Howver,in the process of building and managing,Underground,bir nedensel of the influence of the terr.Surrounding there must be a certain degree of deformation,if the deformation is not monitored and maintained,it will lead to the wall cracking around the subway,ground collapse and other phenomena,the lives and property of the country and people caused no small threat.Therefore,it is more and more important to monitor the deformation along the subway line.The traditional survey method has a long period and can not keep up with the high-speed development,Distorted Tren cannot be objectively reflected.Large metro area d.With rapid development.Synthetic Aperture Radar(InSAR)technology ent in recent years,it has become a necessary technology for large-scale multi-temporal deformation monitoring,which can continuously observe the research area all the time,and has abundant data sources,and can be used to analyze and verify each other.Now it has become a powerful tool for deformation monitoring along metro lines.In this paper,the PS-InSAR technique and the monitoring method of SBAS-InSAR technique included by SARscape in Envi are analyzed in detail,and the principle of InSAR is emphatically introduced.Finally,the deformation monitoring of the main city area of Xi’an and the metro line is analyzed by the above two methods.Its main contents include:1.The basic principles and data processing methods of Insar,PS-InSAR and SBAS-InSAR are introduced.2.The key algorithms of InSAR are introduced,including filtering algorithm and phase unwrapping algorithm.3.SENTINEL-1 data from March 2017 to May 2020 were used to process the data.The PS-InSAR method is used to process the data of the study area.Firstly,the deformation trend of the whole urban area of Xi’an and the causes of the deformation are analyzed.Secondly,the deformation of the Metro Line in Xi’an City is extracted,and the points,lines and planes4.along the metro line are analyzed to obtain the deformation characteristics of the points,lines and planes.The SBAS-InSAR method is used to process the data of the study area,and the same method is used to analyze the urban area and subway line of Xi’an as PS-InSAR method.4.The results of field survey,GPS and leveling data are compared to verify the reliability of the deformation trend of the urban area and Metro Lines in Xi’an.