Time sequence InSAR (Interferometric Synthetic Aperture Radar) deformation monitoring method and device based on polynomial inversion model

Abstract

The invention provides a time sequence InSAR (Interferometric Synthetic Aperture Radar) deformation monitoring method and a device based on a polynomial inversion model. The method comprises the following steps of: combining N SAR (Synthetic Aperture Radar) single look complexes of a certain region to generate M interference pictures and generate M differential phase pictures; calculating an average coherent coefficient picture and extracting high coherent points; establishing a polynomial inversion model by carrying out difference again on a differential phase of the two adjacent high coherent points; solving relative polynomial deformation and a relative elevation error of the adjacent points respectively integrating by taking a certain high coherent point provided with known deformation amount and a DEM (Dynamic Effect Model) error as a reference point to obtain the polynomial deformation and the elevation error of each high coherent point; after a phase of the polynomial inversion model is obtained, subtracting the phase of the polynomial inversion model from the differential phase of the high coherent points to obtain a residual phase; and extracting residual deformation from the differential phase to be overlapped with the polynomial deformation to obtain ground surface deformation information of the high coherent points. The method provides a solution for highly-precisely monitoring the ground surface deformation.

Description

technical field [0001] The present invention relates to synthetic aperture radar technology, in particular to a time-series synthetic aperture radar interferometry (InSAR, Synthetic Aperture Radar Interferometry) deformation monitoring method and device based on a polynomial inversion model. Background technique [0002] Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) is the most important earth observation technology developed in the 1950s. It transmits electromagnetic pulse signals at a certain time interval through the radar antenna during the movement with the carrier, and at different positions The echo signal reflected by ground objects is received, recorded and stored to form a high-resolution image of the ground. Compared with traditional visible light and near-infrared remote sensing technologies, SAR has all-weather and all-time imaging capabilities, and is not affected by weather and time. For example, microwaves can penetrate clouds and rain areas to a c...

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Problems solved by technology

[0007] Embodiments of the present invention provide a time series InSAR deformation monitoring method and device based on a polynomial inversion model to solve the problem of how to use time series InSAR for high-precision surface deformation monitoring

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