GNSS-R sea surface height measurement method based on variable step size line segment intermediate frequency data processing

By employing the variable step-size line segment method and GPU parallel processing architecture in the spaceborne GNSS-R system, the computational bottleneck of the spaceborne platform was solved, achieving more efficient sea surface altimetry accuracy and throughput.

CN122110158BActive Publication Date: 2026-07-07HARBIN INST OF TECH AT WEIHAI
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Patent Information

Application Number
CN202610578024.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-29
Publication Date
2026-07-07
Estimated Expiration
2046-04-29

AI Technical Summary

Technical Problem

The existing spaceborne GNSS-R signal processing system lacks sufficient development and optimization of the end-to-end processing link for spaceborne platforms. The computing speed and data processing capability have become bottlenecks restricting its further development, especially under the conditions of large-scale epoch channels, the computing efficiency and real-time processing pressure are relatively high.

Method used

A GNSS-R sea surface altimetry method based on variable step-size line segment intermediate frequency data processing is adopted. A novel variable step-size line segment method (NVSLSM) is used to accelerate the solution of specular reflection points, and an FFT-based GPU parallel processing architecture is constructed to optimize computational efficiency.

Benefits of technology

It significantly improves computational efficiency, reduces the number of iterations and computational overhead, enhances the throughput of mid-frequency data processing, and achieves more efficient accuracy and stability in sea surface altimetry.

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Abstract

The present application relates to the technical field of satellite altimetry and ocean surveying and mapping, and in particular to a GNSS-R sea surface height measurement method based on variable step line segment intermediate frequency data processing, which can effectively improve the measurement accuracy and efficiency, comprising obtaining satellite-borne GNSS-R original intermediate frequency data, calculating mirror reflection points through a new variable step line segment (NVSLSM), generating a delay Doppler map (DDM), and performing sea surface height inversion. Compared with the prior art, the NVSLSM is used to process the mirror reflection points, the calculation time is increased by about 2.04 times and 1.47 times compared with the line segment bisection method and the QH method, and on the premise of ensuring the convergence accuracy, the stable solution can be reached through fewer iteration steps, thereby reducing the calculation cost per sample; in the delay Doppler map generation link, the overall calculation efficiency is increased by more than about 90%.
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