InSAR atmospheric delay correction method assisted by GNSS chromatography technology

An atmospheric delay and technical technology, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve problems such as inconsistency in observation time, achieve the effect of solving inconsistency in observation time, avoiding estimation errors, and high-precision correction
CN112711022AActive Publication Date: 2021-04-27CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Publication Date
2021-04-27

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Abstract

The invention provides an InSAR atmospheric delay correction method assisted by a GNSS chromatography technology. The InSAR atmospheric delay correction method comprises the following steps of S10, reconstructing a three-dimensional total refractive index field of atmospheric water vapor in a research area, S20, taking the radiosonde data of the research area as a reference value, carrying out the precision evaluation of the chromatography result, and carrying out the step S30 if the precision meets the requirements, S30, obtaining a refined three-dimensional total refractive index field by using a spatial interpolation algorithm, S40, estimating the oblique path total delay amount of the SAR signals in the main image and the auxiliary image by using a Ray-tracing algorithm, S50, generating an atmospheric delay phase diagram of the interferometric SAR image, S60, generating an SAR unwrapping interferometric phase diagram, and S70, obtaining an InSAR phase diagram of atmospheric correction. According to the InSAR atmospheric delay correction method assisted by a GNSS chromatography technology, the GNSS chromatography technology and the spatial interpolation algorithm are utilized to acquire the refined three-dimensional total refractive index field, and the Ray-tracing algorithm is combined to accurately estimate the oblique path atmospheric delay amount of the three-dimensional SAR signal, so that the inversion precision of the atmospheric delay phase of the SAR image is improved, and high-precision correction of InSAR atmospheric delay is realized.
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Description

technical field

[0001] The invention relates to the field of InSAR atmospheric delay correction, in particular to an InSAR atmospheric delay correction method assisted by GNSS tomographic technology. Background technique

[0002] Synthetic aperture radar interferometry (Interferometric Synthetic Aperture Radar, InSAR), as a space geodetic method with great application value in recent years, has the advantages of high precision, wide range, and high resolution. And glacier movement monitoring and other fields have broad application prospects. In actual measurement, SAR satellite signals are affected by atmospheric water vapor, causing propagation path delay, that is, atmospheric delay effect, which not only reduces the measurement accuracy of InSAR technology, but also limits the application range of InSAR technology to a certain extent.

[0003] Atmospheric delay in InSAR measurement refers to the difference in the delay of the propagation path caused by atmospheric refract...

Claims

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