Landslide three-dimensional deformation resolving method and system fusing GNSS and ascending and descending orbit time sequence InSAR

Abstract

The invention discloses a landslide three-dimensional deformation calculation method fusing GNSS and ascending and descending orbit time sequence InSAR, which belongs to the technical field of risk identification, and is used for solving the technical problem of incomplete results of an existing detection mode. The method comprises the following steps of: acquiring a plurality of ascending and descending orbit radar satellite original images in a GNSS monitoring period of a target monitoring area; acquiring surface deformation of the target monitoring area under the view angle of a ascending and descending orbit radar through a time sequence InSAR method; decomposing the surface deformation of the target monitoring area in the three-dimensional direction under the view angle of the ascending and descending orbit radar; and calculating three-dimensional deformation of the target monitoring area by fusing an InSAR-GNSS three-dimensional joint calculation model, and performing landslide identification on the target monitoring area according to the three-dimensional deformation. According to the method, the problem that it is difficult for InSAR to obtain three-dimensional deformationis effectively solved, effective unification of high time resolution and high plane position precision of GNSS and high spatial resolution and elevation deformation precision of the InSAR technology is realized, and the method has very high practicability for obtaining a landslide three-dimensional deformation field.

Description

technical field [0001] The invention relates to the technical field of risk identification, in particular to a landslide three-dimensional deformation calculation method and system that integrates GNSS and ascending and descending rail timing InSAR. Background technique [0002] Accurate and effective monitoring of landslides is the basis for early prediction of landslide disasters, and is also an important means of landslide disaster risk assessment and disaster prevention and mitigation. The traditional slope contact safety monitoring method has high cost, difficult equipment maintenance, low reliability, and can only obtain "point" monitoring information, and it is difficult to obtain slope "surface" dynamic change information, which is not suitable for reservoir slopes Large-scale deformation monitoring. Synthetic aperture radar interferometry (Interferometric Synthetic Aperture Radar, InSAR) technology can carry out stable and continuous observation of the surface with...

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Problems solved by technology

[0005] The global navigation satellite system (GNSS, GPS / Beidou system) can obtain continuous three-dimensional deformation monitoring results of the surface, but limited by the conditions of ground receiving equipment, it is often unable to achieve a high network density, which belongs to discrete point observation and spatial resolution However, InSAR can provide surface continuous information of the entire research area; InSAR is not sensitive to horizontal deformation information, while the global navigation satellite system (GNSS, GPS / Beidou system) The horizontal deformation accuracy is high, and the data fusion of the two can not only correct the errors that are difficult to eliminate in the InSAR data itself, but also realize the effective unity of the high time resolution and high plane position accuracy of GNSS and the high spatial resolution and elevation deformation accuracy of InSAR technology

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