Pixel tracking deformation monitoring method based on high-orbit SAR
By correcting radar system errors and ionospheric influence errors in SAR images, and combining orbital parameters and local windowing methods, the problem of insufficient error correction in pixel tracking methods is solved, achieving high-precision surface deformation monitoring and improving the ability to issue early warnings for natural disasters.
CN121855429APending Publication Date: 2026-04-14XIAN INSTITUE OF SPACE RADIO TECH
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-14
AI Technical Summary
Technical Problem
Existing pixel tracking methods fail to effectively correct radar system errors and ionospheric influence errors, resulting in insufficient monitoring accuracy.
Method used
By compensating for radar system errors and ionospheric influence errors in SAR images of the same observation area at different time periods, coarse and precise registration are performed in conjunction with orbital parameter files. Corresponding points are obtained using the local window method and least squares polynomial fitting is used to correct the offset caused by the orbit, thus obtaining the actual surface deformation.
Benefits of technology
It improved monitoring accuracy, enhanced the ability to issue early warnings for natural disasters, and reduced disaster losses.
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Figure CN121855429A_ABST
Abstract
The invention discloses a pixel tracking deformation monitoring method based on a high-orbit SAR (Synthetic Aperture Radar). The method comprises the following steps of: 1, selecting two SAR images in different time periods in the same observation area, and compensating a radar system error and an ionosphere influence error of the SAR images; 2, calculating the offset of the SAR images caused by the orbit error, and carrying out coarse registration on the two SAR images; step 3, performing accurate registration on the two SAR images after coarse registration, acquiring a certain number of homonymy points from the two images by adopting a local window method, then fitting a mapping relation of the two images to perform pixel tracking on the two images, and acquiring a local offset; and 4, defining an expression of a local offset, and removing the offset caused by the orbit to obtain the deformation of the actual earth surface in the distance direction and the azimuth direction. According to the method, the radar system error and the ionosphere influence error are corrected, and the accuracy of the obtained change monitoring result is high.
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