The correction of rain effect on SAR wind field retrieval

Yu Shui; Yang Jingsong; He Shuangyan; He Zhiguo; Ren Lin; Zheng Gang

doi:10.3969/j.issn.0253-4193.2017.09.004

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Yu Shui, Yang Jingsong, He Shuangyan, He Zhiguo, Ren Lin, Zheng Gang. The correction of rain effect on SAR wind field retrieval[J]. Haiyang Xuebao, 2017, 39(9): 40-50. doi: 10.3969/j.issn.0253-4193.2017.09.004

Citation:

Yu Shui, Yang Jingsong, He Shuangyan, He Zhiguo, Ren Lin, Zheng Gang. The correction of rain effect on SAR wind field retrieval[J]. Haiyang Xuebao, 2017, 39(9): 40-50. doi: 10.3969/j.issn.0253-4193.2017.09.004

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The correction of rain effect on SAR wind field retrieval

doi: 10.3969/j.issn.0253-4193.2017.09.004

1.
Ocean College, Zhejiang University, Zhoushan 316021, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Ocean College, Zhejiang University, Zhoushan 316021, China

Received Date: 2016-10-26
Rev Recd Date: 2017-02-23

Abstract

Abstract

Synthetic Aperture Radar (SAR) plays an important role in typhoon wind field retrieval, but due to the influence of the rainfall on the radar signal, the inversion precision of sea surface wind field will decline. In this paper, we analysis the rain effect to the 2014 typhoon Rammasun by using RADARSAT-2 SAR data, quasi-synchronous rainfall data and reanalysis data. The damping from rainfall to the water surface is simulated by rain rate and incident angle. Rain-induced attenuation and raindrop volumetric scattering was also evaluated. It is found that the rain effect to the sea surface perturbation is much complex than the other two factors, and the signal attenuation increases with the increases of rainfall and incident angle, raindrop volumetric scattering and rain-induced sea surface damping increase with the increase of rainfall, but with the decrease of incident angle. The experimental results also indicate that the model can improve the SAR wind measurement accuracy under rainfall conditions.
- SAR,
- wind field retrieval,
- rain effect,
- correction

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References(29)

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