Method for efficiently reducing atmospheric phase influence through superposition of sequential relay interferograms

Abstract

The present invention relates to a method for efficiently reducing an atmospheric phase influence through superposition of sequential relay interferograms, comprising: step 1: data collection and selection: collecting heavy-rail single look complex SAR data sets which cover the same area; cutting the data sets to obtain the SAR data sets which cover the areas of interest; step 2: determining mainimages and auxiliary images in a time sequence; simultaneously using the main images of a previous pair of SAR images as the auxiliary images of a next pair to perform relay combinations; selecting two SAR images which have similar meteorological conditions during imaging as a first image and a last image to reduce the influence of a residual phase in subsequently superimposed interferograms to the largest degree; step 3: conducting interference processing on every two of the above pairs of SAR interferograms in the time sequence in radar interferometry processing software to obtain corresponding sequential relay SAR interferogram sets; and step 4: conducting mean processing of interference phase superposition on the sequential relay interferogram sets to efficiently reduce the atmosphericphase influence and obtain high-precision surface deformation fields of the areas of interest.

Description

technical field [0001] The invention relates to the fields of obtaining ground (surface and below) subsidence information in space-to-earth observation, geodetic survey, engineering survey and geological disaster monitoring, especially the monitoring of regional land subsidence, urban ground subsidence monitoring caused by excessive exploitation of groundwater, and the like. The present invention provides a method for efficiently reducing the influence of atmospheric phase in the above technical field. Background technique [0002] Synthetic aperture radar interferometry (InSAR, synthetic aperture radar interferometry) technology has been widely used in terrain mapping, surface deformation monitoring and other fields. However, the influence of atmospheric phase is an important factor that limits the wide application of SAR interferometry in repeated orbits. Due to the heterogeneity of the atmosphere and atmospheric disturbances, electromagnetic waves will experience propaga...

AI Technical Summary

Problems solved by technology

[0007] From the above analysis, it can be seen that there are some limiting factors in the existing technologies. PS-InSAR, SBAS methods and traditional interferogram superposition methods all require a large amount of SAR image data, and obtaining a large amount of SAR image data is also a time-consuming, labor-intensive, and labor-intensive process. costly process

The efficiency of the traditional interferogram superposition method to eliminate the influence of atmospheric phase is low

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