Deformation Monitoring Of Ground-based InSAR Based On TCPInSAR Technology

High-precision real-time deformation monitoring is an important means of safety monitoring of open-pit mine slopes and landslides.Compared with spaceborne interferometric synthetic aperture radar(InSAR),ground-based InSAR(GB-InSAR)has the characteristics of zero space baseline,high sampling rate,precise orbit determination,and it can flexibly select the site to meet the needs of dynamic and emergency monitoring.These characteristics of GB-InSAR are more suitable for monitoring dangerous open-pit mine slopes and landslides.The application of GB-InSAR technology in deformation monitoring will be limited to two aspects.One is that the atmospheric phase contribution brought by the difference in atmospheric conditions between data collection intervals cannot be ignored.The second is that GB-InSAR systems are usually used.The Ku-band radar system has a shorter wavelength than the general spaceborne radar,which will bring about more severe de-coherence,and the phase aliasing caused by the de-correlation will increase the difficulty of phase unwrapping.Based on these two problems,this paper proposes the monitoring of ground-based InSAR deformation based on TCPInSAR technology.Data analysis is performed without unwrapping to avoid unwrapping errors caused by the unwrapping step,and a local Delaunay triangle network is used to construct the network and phase model Atmospheric models have been added to reduce the effects of atmospheric phase.This study collected data collected from a total of 617 MIMO ground-based radar equipment at the Malanzhuang Open-pit Iron Mine in Tangshan from August 14,2018 to September 13,2018,and a total of 252 GPRI-II portable radar interferometers at a landslide at a road in Shaoxing,Zhejiang,from October 12,2018 to October 13,2018.This study used a program written in MATLAB software to analyze the timing of these two sets of data.In this paper,based on the basic principles of GB-InSAR,a series of deformation studies are carried out.The main work is as follows:First,in order to verify the accuracy of the procedures and methods,this paper constructs simulation data,and conducts experimental research and data processing on the simulated data.The experimental results verify the reliability and accuracy of the procedures and methods.Secondly,an experimental study was conducted on the slope of the Malanzhuang Open-pit Mine in Tangshan,which verified the validity of the atmospheric phase estimated by the atmospheric model and confirmed that the deformation monitoring accuracy reached sub-millimeter level.Finally,an experimental study on a road landslide in Shaoxing,Zhejiang Province,verified that the three-threshold method is better for extracting TCP,and also verified the effectiveness of the new method for ground-based InSAR deformation monitoring.