InSAR-based monitoring method for airport deformation in reclamation areas

Abstract

The invention provides an InSAR-based monitoring method for airport deformation in reclamation areas. The InSAR-based monitoring method for airport deformation in the reclamation areas comprises the steps that candidate point targets distributed discretely are extracted; the phase standard deviation of each candidate point target is calculated to obtain a stable point target; three-dimensional space-time unwrapping is carried out on a phase of the stable point target to obtain an unwrapped phase; a least square method is used, and a deformation phase containing spatial interference componentsis obtained; an atmospheric phase and an orbit error phase are separated out according to the deformation phase containing the spatial interference components to obtain the deformation phase; and theweight of the deformation phase and the time series deformation of the stable point target are calculated, so that the monitoring of the airport deformation in the reclamation areas is completed by using the time series InSAR technology. According to the InSAR-based monitoring method for airport deformation in the reclamation areas, an amplitude deviation threshold value and a time coherence coefficient method are combined, so that the number and density of the candidate point targets in the reclamation airport areas are improved, and the deformation rate accuracy is improved; and the InSAR-based airport deformation monitoring method of the reclamation areas can further be used for high-precision inversion of deformation fields in complex field areas in low coherence areas.

Description

technical field [0001] The invention belongs to the technical field of surface deformation monitoring, in particular to an InSAR-based method for monitoring airport deformation in reclamation areas. Background technique [0002] Conventional surface deformation monitoring methods mainly include traditional geodetic surveying, such as setting layer markers, leveling surveys, and GPS surveys. The above monitoring methods can only obtain deformation data at a small number of discrete observation points, and cannot be used to reveal the spatiotemporal evolution of the surface deformation field. Compared with the traditional surface monitoring methods, the time series InSAR technology can monitor deformation in a large range, and the accuracy can be achieved. up to millimeters. By collecting SAR image sets covering the same area, this technology focuses on ground point targets that maintain high coherence in long-term sequence SAR images. It has been successfully applied to urba...

AI Technical Summary

Problems solved by technology

However, the X-band radar has a short wavelength and is easily affected by decoherence. At the same time, the geological conditions of land reclamation areas are usually complex, and complex geological conditions will cause the deformation pattern of the buildings on it to change, resulting in InSAR Difficulty interpreting deformation observations

[0005] Therefore, how to combine high-resolution TerraSAR-X satellite images to expand the application of time-series InSAR technology in low-coherence areas such as land reclamation is facing new opportunities and challenges

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