InSAR time sequence three-dimensional deformation monitoring method oriented to winding phase

Abstract

The invention belongs to the technical field of interferometric synthetic aperture radars and particularly relates to a wrapping phase-oriented InSAR time sequence three-dimensional deformation monitoring method. The method comprising the following steps of collecting a multi-track time sequence SAR image, obtaining an interference pair data set and a time sequence high coherence point data set, constructing a Delaunay triangulation network, and establishing a function relationship between a multi-track time sequence InSAR wrapping phase and a time sequence three-dimensional earth surface deformation gradient based on an earth surface stress-strain model; the time sequence three-dimensional earth surface deformation gradient is solved by adopting an iterative weighted least square method, the time sequence three-dimensional earth surface deformation of a target arc section is obtained, the time sequence three-dimensional earth surface deformation on each high-coherence point is obtained through spatial integration, the method avoids an interference graph unwrapping step in the earth surface deformation solving process, the influence of observation values with large gross errors and errors on unknown parameter calculation is reduced, and the InSAR three-dimensional surface deformation monitoring process is efficient and accurate.

Description

technical field [0001] The invention belongs to the technical field of interference synthetic aperture radar, and in particular relates to an InSAR time-series three-dimensional deformation monitoring method oriented to winding phase. Background technique [0002] Interferometric Synthetic Aperture Radar (SAR, InSAR) technology uses two SAR images to quickly obtain large-scale, high-resolution surface deformation results. However, the InSAR data of a single orbit can only obtain the one-dimensional projection of the real three-dimensional deformation along the line of sight of the radar satellite, and it is difficult to accurately reveal the characteristics of the real surface motion, which can easily lead to misjudgment and misjudgment. With the increasing number of SAR satellites, InSAR time-series deformation observation data in different directions from multiple orbits / different technologies can be obtained in the same research area, which provides an opportunity for the...

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Problems solved by technology

[0004] Based on this, the present invention aims at the difficulty of phase unwrapping in the traditional method of InSAR three-dimensional surface deformation monitoring, based on the surface stress-strain model, by using iterative weighted least squares method to solve the three-dimensional deformation gradient, to realize InSAR three-dimensional surface deformation monitoring

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