A method for atmospheric phase correction and deformation extraction of a distributed InSAR system

By employing multi-satellite near-synchronous observation and data processing methods in a distributed InSAR system, the problem of atmospheric phase delay in traditional InSAR technology is solved, enabling high-precision deformation extraction, which is suitable for monitoring urban subsidence and natural disasters.

CN121784742BActive Publication Date: 2026-05-19ZHONGKE XINGTU SPACE TECH CO LTD +1
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Patent Information

Application Number
CN202610267736.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-06
Publication Date
2026-05-19
Estimated Expiration
2046-03-06

AI Technical Summary

Technical Problem

Traditional InSAR technology struggles to effectively correct atmospheric phase delay when faced with complex and variable small-scale atmospheric turbulence, resulting in the masking of deformation signals. This is especially true in areas with high vegetation cover where the density of monitoring points is low, making it impossible to obtain sufficient deformation information.

Method used

A distributed InSAR system is used to perform image registration using near-synchronous observation data from multiple satellites, obtain interferometric phase through conjugate multiplication, perform atmospheric phase correction, and combine phase filtering and unwrapping processing. Finally, geocoding is performed to extract deformation.

Benefits of technology

It achieves high-precision atmospheric phase correction and deformation extraction, eliminates noise and ambiguity, and improves the accuracy and reliability of deformation monitoring, making it suitable for long-term urban subsidence monitoring and emergency response to natural disasters.

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Abstract

The application discloses a distributed InSAR system atmospheric phase correction and deformation extraction method, belongs to the field of satellite image processing, and is characterized in that the method comprises the following steps: acquiring multi-satellite near-synchronous observation data of a distributed InSAR system to perform image registration; performing conjugate multiplication on the registered images to obtain interference phases; performing difference on the two interference phases to perform atmospheric phase correction; performing phase filtering processing on the interference phases after the atmospheric phase correction; performing phase unwrapping on the interference phases after the filtering processing; and performing geocoding processing to complete deformation extraction. Through near-synchronous imaging of multiple platforms on the same region, the generation path of time dimension interference is cut off from the physical layer, the influence of short-term atmospheric fluctuation on the phase is greatly weakened, noise and ambiguity in the phase unwrapping process are further removed in combination with the redundancy of multi-view observation of the distributed system, and high-precision extraction of the surface deformation field is realized.
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