| 摘要: |
| 本文提出了一种白冠海面的小入射角星载雷达后向散射模型，模型包括海面非波浪破碎部分和波浪破碎部分的后向散射。在风的作用下，海浪破碎形成白冠，对星载雷达的后向散射信号造成影响。文中利用热带降雨测绘任务卫星搭载的降雨雷达（TRMM PR）和欧洲中期天气预报中心（ECMWF）的时空匹配数据集，拟合得出小入射角下星载雷达海面波浪破碎部分的后向散射模型，并分别与高斯分布/非高斯的海浪斜率分布海面的准镜面散射模型组成了白冠海面小入射角星载雷达后向散射模型。经实测数据对比，本文提出的由非高斯准镜面散射和考虑波浪破碎组合模型有效。 |
| 关键词: 白冠海面 半经验方法 小入射角 后向散射模型 |
| DOI：10.11759/hykx20201107002 |
| 分类号:TP722.6 |
| 基金项目:国家重点研发计划项目（2017YFC1405600）；中央高校基本科研业务费专项资金资助（17CX02079） |
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| Whitecap sea surface backscattering model for low incidence angles |
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QU Xiao-jun, LI Chen, DAI Yong-shou
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College of Oceanography and Space Informatics, China University of Petroleum, Qingdao 266580, China
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| Abstract: |
| This study presents a spaceborne radar backscattering model of a whitecap sea surface under low incidence angles, which includes the backscatters of the non-wave-breaking region and the wave-breaking region of the sea surface. With wind, the broken waves form whitecaps, which affect the backscattering signal of the spaceborne radar. The backscattering model of the sea surface wave-breaking region of the spaceborne radar under low incidence angles is fitted based on the space-time collocating datasets of tropical rainfall measuring mission precipitation radar (TRMM PR) and European centre for medium-range weather forecasts (ECMWF). The whitecap sea surface spaceborne radar backscattering model is formed by comparing it with the quasi-specular scattering model under the Gaussian/non-Gaussian probability density distribution of sea surface slopes at low incidence angles. Compared with the measured data, the combined model of non-Gaussian quasi-specular scattering and wave breaking proposed in this paper is found to be effective. |
| Key words: whitecap sea surface semi-empirical method low incidence angles backscattering models |
