An insar surface deformation monitoring method

Abstract

The invention belongs to the field of InSAR-based surface deformation monitoring and discloses an InSAR-based surface deformation monitoring method, which comprises the following steps: processing SARimages acquired by all SAR satellites covering a research area to obtain deformation time sequences corresponding to each SAR data subset; calculating corresponding residual deformation time sequences according to the deformation time sequences corresponding to each SAR data subset; obtaining periods of the residual time sequences of each SAR data subset; selecting one period as a constraint condition; and calculating a deformation time sequence added with the constraint condition: solving an observation equation by use of a least square method to obtain a linear surface deformation time sequence, and adding a corresponding linear deformation thereto to obtain a final surface deformation time sequence. According to the method, a deformation time sequence of a higher physical significancecan be acquired; and in addition, an optimal solution consistent with a surface deformation rule can be acquired independently of an additional linear deformation model, thereby implementing high-accuracy and long-time-span sequential monitoring over a surface deformation in the research area.

Description

technical field [0001] The invention belongs to the field of InSAR surface deformation monitoring, in particular to an InSAR surface deformation monitoring method. Background technique [0002] Affected by factors such as SAR satellite’s on-orbit operating life, flight plan, and revisit cycle, it is difficult to use the SAR image of a single SAR satellite to meet the requirements of long-term InSAR deformation monitoring for the imaging time distribution density and time length of each SAR image. The method of time-series monitoring of surface deformation by joint calculation of data came into being. The joint solution of different SAR satellite data for surface deformation time-series monitoring technology refers to: the unwrapped phase of the interference pair generated by the combination of different SAR satellite data that has been registered to the unified geographic coordinate system is used as the observation value, and the adjacent SAR image is used to obtain The de...

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Problems solved by technology

[0005] When solving the problem of lack of deformation reference among subsets in the prior art, the obtained deformation time series has no physical meaning, or depends on the additional linear deformation model or the additional interference pair quality, and cannot obtain the optimal surface deformation law. To solve the problem, the purpose of the present invention is to provide a method for monitoring InSAR surface deformation

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