An iterative retrieval algorithm of ocean surface current based on SAR Doppler centroid anomaly

Qin Yanping; Fan Chenqing; Zhang Yubin

doi:10.12284/hyxb2022007

Volume 44 Issue 3

Mar. 2022

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Qin Yanping，Fan Chenqing，Zhang Yubin. An iterative retrieval algorithm of ocean surface current based on SAR Doppler centroid anomaly[J]. Haiyang Xuebao，2022, 44(3)：109–117 doi: 10.12284/hyxb2022007

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An iterative retrieval algorithm of ocean surface current based on SAR Doppler centroid anomaly

doi: 10.12284/hyxb2022007

1.
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China
2.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China

Received Date: 2020-12-31
Rev Recd Date: 2021-11-01
Publish Date: 2022-03-18

Abstract

Abstract

To overcome the difficulty of removing the wind field contribution in the SAR Doppler centroid anomaly method when retrieving the ocean surface current, in this paper, a secant downhill method based on the M4S model is proposed. The contribution of the wind field is removed by iteratively calculating the sea surface current field in a local area and subsequently estimating the wind contribution factor to the Doppler velocity of the whole SAR map. Our method is used to retrieve the radial velocity of sea surface from Radarsat-2 data. Its retrieval accuracy is verified by matching measured data. The results show that the proposed method not only can possess well convergence and high convergent speed, but also the deviation of the radial velocity of the surface is 0.04 m/s and 0.15 m/s respectively for two scene SAR data used in this paper.
- SAR,
- Doppler centroid anomaly,
- ocean surface current,
- secant downhill method

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References(31)

References

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