Regional ground settlement monitoring method based on multiple track and long strip CTInSAR (coherent target synthetic aperture radar interferometry)

Abstract

Disclosed is a regional ground settlement monitoring method based on multiple track and long strip CTInSAR (coherent target synthetic aperture radar interferometry). The regional ground settlement monitoring method based on the multiple track and long strip CTInSAR includes seven steps: step 1, partitioning long strip radar data and performing accurate registration on the long strip radar data after being partitioned; step 2, generating a differential interference stripe atlas; step 3, removing track remnant phase positions; step 4, performing CTInSAR timing sequence analysis; step 5, examining and correcting adjacent partitioning blocks of a long strip; step 6, unifying coordinate systems of multiple tracks; step 7, examining information of the multiple tacks and unifying basis references. The regional ground settlement monitoring method based on the multiple track and long strip CTInSAR solves the two main problems that how to reduce error influences of base line error, atmospheric oscillation, phase unwrapping noise and the like, which show obvious low frequency characteristics along with range enlargement in a spatial domain during the deformation information extraction process and how to perform the accurate registration on deformation monitoring results of the adjacent tracks on space positions, which are encountered during the large region deformation survey and monitor process of InSAR (synthetic aperture radar interferometry), and unifies the basis references of deformation measurement among the different tracks.

Description

technical field [0001] The invention relates to a regional land subsidence monitoring method integrating multi-track and long-strip CTInSAR (Coherent Target SAR Interferometry, coherent target synthetic aperture radar interferometry), belonging to the technical application field of synthetic aperture radar interferometry (InSAR). It overcomes the problems of error propagation and reference deviation in the process of large-area CTInSAR data processing, and achieves high-precision investigation and monitoring of regional land subsidence. Background technique [0002] At present, there is a large-scale land subsidence in China. The three main subsidence areas of the North China Plain, the Yangtze River Delta, and the Fenwei Valley have an impact area of ​​more than tens of thousands of square kilometers, and have the characteristics of further expanding and contiguous distribution. In other areas such as Jianghan Plain, Songnen Plain, Lower Liaohe River and Pearl River Delta, ...

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Problems solved by technology

[0008] The purpose of the present invention is to obtain full-coverage, high-precision regional land subsidence information at the same time, and solve two main problems encountered by InSAR in large-area deformation investigation and monitoring. One is how to weaken the baseline in the deformation information extraction process. Errors, atmospheric fluctuations, and phase unwrapping noises, etc., in the spatial domain show obvious low-frequency characteristics as the range increases; the second is how to accurately register the deformation monitoring results of adjacent orbits on the spatial position, and unify different Reference Datum for Deformation Measurement Between Tracks

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