Deformation Monitoring of Urban Rail Transit Tunnels Based on SBAS-InSAR Technology
Due to the influence of lighting conditions,dust and smoke inside the tunnel,the accuracy and reliability of scanning data are reduced,resulting in errors in deformation monitoring.Therefore,a deformation monitoring method for urban rail transit tunnels based on small baseline subset interferometric synthetic aperture radar(SBAS-InSAR)technology is designed.To study the deformation problem of urban rail transit tunnels,Single Look Complex data of synthetic aperture radar(SAR)Sentinel-IA is selected,and the images used includ descending track 62 and ascending track 55.The advanced spaceborne ther-mal emission and reflection radiometer global digital elevation model(ASTER GDEM)is selected for digital elevation model(DEM).Combining geometric registration methods with image correlation registration methods,the system implements coarse registration of SAR images.On the basis of coarse registration,fine registration is implemented by the enhanced spectral diver-sity method.To overcome the problem that the conventional interferometric synthetic aperture radar(InSAR)technology has when the spatial baselines are longer,the SBAS-InSAR technology is adopted to obtain deformation information of urban rail transit tunnels and improve the resolution of data in time sampling.The case test results show that the deformation monitoring results of the designed method are relatively accurate.
万方数据
维普
