Satellite interference measurement method for frozen soil seasonal deformation

Abstract

The invention discloses a satellite interference measurement method for frozen soil seasonal deformation. The satellite interference measurement method comprises the following steps of: registering SAR images of a frozen soil region and resampling the SAR images into the same space coordinate system; pairing the converted SAR images, and selecting interference pairs meeting set conditions for carrying out interference; removing a reference ellipsoid phase of each point in an interferogram by adopting precision orbit data, simulating a terrain phase by adopting a high-precision DEM, and removing a terrain phase of each point in the interferogram to obtain a differential interferogram; filtering the differential interferogram, carrying out phase unwrapping on the filtered interferogram by adopting a minimum cost flow method, and converting an unwrapping phase into surface deformation; acquiring the number of pixels exceeding a preset coherence coefficient in a interference pair time sequence, and selecting pixel points of which the number is greater than a preset number as short-time high coherence points; and according to the selected short-time high-coherence points, solving an average rate and cumulant of frozen soil seasonal deformation point by point by utilizing a Stacking method based on a linear model.

Description

technical field [0001] The invention relates to the technical field of research on seasonal deformation of frozen soil, in particular to a satellite interferometry method for seasonal deformation of frozen soil. Background technique [0002] With the global warming, the global permafrost is experiencing severe degradation, and the permafrost degradation problem facing the Qinghai-Tibet Plateau is even more serious. The degradation of permafrost on the plateau is mainly manifested in the increase of the average ground temperature, the reduction of the permafrost area, and the reduction of the active layer. Thickness increases and the lower limit of permafrost rises, etc. The degradation of permafrost has caused a series of natural disasters and ecological environment problems. In the context of global warming, as the permafrost melts, the carbohydrates contained in the permafrost may undergo a series of chemical reactions, and eventually be discharged into the atmosphere in ...

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the satellite interferometry method of seasonal deformation of frozen soil provided by the present invention solves the problem that the monitoring of surface deformation in frozen soil area is affected by phase time loss correlation

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