| With the support of "transmission of power in west to east,the 12 th five-year plan" and " UHV power transmission ",the smart grid planning background,The hydropower output channel in southwest si chuan plateau occupies an important position in the state grid layout structure.Limited by the unique geographical environment of the western si chuan plateau,the transmission corridors are built between the mountains,which is affected by geological disasters,and has great impact by the climate disasters,and difficult to repair and rescue.The stable operation of the power grid has greatly affected the safe operation.Traditional monitoring means,such as manual patrol,installation of deformation detectors,etc.,are labor-intensive,high input,and lack of overall and time-limited characteristics.With all-day,all-weather,high-precision,large-scale surface deformation monitoring technology-DInSAR,it can effectively and comprehensively monitor the deformation distribution in the transmission corridor area.The data processed by PSInSAR has are discrete permanent scattering points,which can be used to monitor the surface deformation of the transmission tower.Synthetic aperture radar interferometry has great potential in the research of transmission corridor security.Atming at the disaster threat of transmission corridor and related technical problems of interferometric SAR image in complex mountainous.The main work of this paper is: Firstly,the application of synthetic aperture radar interferometry in the field of wide-field monitoring is studied in detail.InSAR technology with high precision phase-skew relation is widely used in earth observation at home and abroad.Secondly,introduce the geometrical principle of InSAR detailly,analyze the image phase information component in real situation,derive the theoretical basis of thdeformation monitoring algorithm-DInSAR.Then,because of the characteristics of discrete,high coherence and stability of the transmission tower in the study area,the terrain deformation is extracted by PSInSAR.Paper studies the key steps of PSInSAR technique-main image selection,PS point identification,discrete PS point 3D irregular network phase unwrapping,etc.The comparison experiment of the experimental area of transmission corridor-maoxian shows: the Comprehensive coherence coefficient method for main image select,the coherent coefficient method and the amplitude dispersion method for PS point identification are applicable to the complex mountainous areas of the transmission corridor.PSInSAR deals with multiple temporal SAR images and establishes 3D irregular network.In contrast to the two-dimensional phase unwrapping of single interferogram,the 3D irregular network phase unwrapping of PSInSAR technique has different theory.The three phase unwrapping algorithms of PSInSAR are applied to the three regions of si chuan maoxian,erlangshan and chengdu,which are great difference in topography,and analyze the influence of methods and topography on monitoring accuracy.The experimental results show that,maoxian,and Erlangshan is less affected by human intervention,and the shape variable is the maximum± 30 mm,which is mainly in the range of± 12 mm,and the deformation of the tower area is around 0mm,and the tower is relatively stable.In chengdu,due to the large time interval and frequent manual intervention,relatively large discrete sparse deformation has occurred. |
