InSAR deformation monitoring method based on spatial constraint

Abstract

The invention relates to an InSAR deformation monitoring method based on spatial constraint, which comprises the following steps of: conducting data acquisition and preprocessing, namely, acquiring an original single-view complex image through a spaceborne radar satellite, and performing image registration and geocoding by using an external DEM to enable all the images to be positioned in a same coordinate framework; selecting an optimal main image from all the images under the same coordinate frame, and forming differential interference pairs by the optimal main image and other images respectively; based on the differential interference pair, selecting and obtaining high-coherence points; performing phase unwrapping processing on the high-coherence points to obtain unwrapped phases of the high-coherence points; for the unwrapping phase, inversing a deformation sequence by using spatial constraint, so as to obtain an initial deformation phase; and carrying out atmospheric error separation on the initial deformation phase to obtain a final deformation phase, namely deformation monitoring information. Compared with the prior art, the method is based on the time sequence InSAR technology, the spatial constraint is reasonably added, and the high-precision deformation sequence can be efficiently and reliably recovered.

Description

technical field [0001] The invention relates to the technical field of surface deformation monitoring, in particular to an InSAR deformation monitoring method based on space constraints. Background technique [0002] Surface deformation monitoring has always been an important part of geographic and national conditions monitoring. my country has a vast territory, complex and diverse landforms, and frequent geological disasters such as landslides, earthquakes, and debris flows; in addition, with the rapid development of society, the excessive exploitation of underground resources and underground construction etc. will cause different degrees of surface deformation. These surface deformations caused by natural disasters or human factors will cause serious harm to the social economy and people's lives. Therefore, it is very important to monitor the surface deformation efficiently and reliably. [0003] Synthetic Aperture Radar Interferometry (InSAR) is a new space geodetic techn...

AI Technical Summary

Problems solved by technology

Current timing techniques restore deformation information by introducing time constraints, that is, deformation model assumptions, but due to the lack of accurate prior information, the existence of model errors will have a large impact on the estimated parameters

Especially in complex deformation scenarios, the time-constrained observation model will cause serious errors in the estimated parameters and cannot correctly invert the deformation

[0005] In addition, some timing techniques solve the rank deficient equation by adding the minimum norm criterion, but this method introduces the center of gravity reference for the parameters as a whole, and does not distinguish between terrain parameters and deformation parameters. Although the equation is solvable, it has no physical meaning.

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