InSAR time sequence earth surface deformation monitoring method based on earth surface stress-strain model

Abstract

The invention provides an InSAR time sequence surface deformation monitoring method based on a surface stress-strain model, and the method comprises the steps: 1, collecting a time sequence SAR imagecovering a to-be-monitored region, achieving the registration and differential interference of the time sequence SAR image based on existing software, and generating an interferogram meeting a presettime-space baseline threshold value; and 2, constructing a local Delaunay triangulation network based on all pixel points in the interferogram. According to the invention, the surface stress-strain model is used to describe a physical and mechanical relationship between surface adjacent point deformations; the precision of InSAR time sequence earth surface deformation monitoring can be obviously improved; modeling and parameter solving are carried out on the basis of an arc section formed by adjacent points, an interference pattern does not need to be unwound, the InSAR data processing efficiency can be effectively improved, and the physical and mechanical relationship of the observation data in space is considered, so that a high-precision InSAR deformation monitoring result with large space coverage density can be obtained without masking a low-coherence region in the interference pattern.

Description

technical field [0001] The invention relates to the field of geodetic survey based on satellite interferometric synthetic aperture radar, in particular to an InSAR time series surface deformation monitoring method based on a surface stress-strain model. Background technique [0002] Interferometric Synthetic Aperture Radar (SAR, InSAR) technology uses two SAR images to measure surface deformation. Time-series InSAR technology (Multiple Temporal InSAR, MTInSAR) analyzes a series of SAR images in time series, and can obtain the time-series surface deformation results of the study area, and can effectively weaken the effects of atmospheric delay, terrain residual, and decoherence errors on surface deformation. impact on the outcome. The monitoring targets of MTInSAR technology are mainly divided into permanent scatterer (Permanent Scatterer, PS) and distributed scatterer (Distributed Scatterer, DS). PS maintains a high signal-to-noise ratio throughout the detection period, bu...

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Problems solved by technology

[0004] The present invention provides an InSAR time-series surface deformation monitoring method based on the surface stress-strain model. Its purpose is to solve the traditional method of only performing mathematical spatial filtering on high-coherence points, or unwrapping and masking the interferogram first, and then performing The point-by-point timing solution does not consider the physical and mechanical relationship between adjacent high-coherence points, and it is easy to lead to the problem of low spatial density of monitoring results

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