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An Improved Method of Retrieving Sea Surface Wind Speed Based on a Four-Layer Medium Model at High Sea States

机译：基于四层介质模型的高海况海面风速反演方法

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Considering about the effect of whitecaps and foams on pulse-limited Radar Altimeters, an improved algorithm of retrieving sea surface wind speed is proposed in this paper. Firstly, a four-layer dielectric model is established in order to simulate an air-sea interface. Secondly, the microwave reflectivity of a sea surface covered by spray droplets and foams at 13.5 GHz is computed based on the established model. These computed results show that the effect of spray droplets and foams in high sea state conditions shall not be negligible on retrieving sea surface wind speed. Finally, compared with the analytical algorithms proposed by Zhao and some calculated results based on a three-layer dielectric model, an improved algorithm of retrieving sea surface wind speed is presented. At a high wind speed, the improved algorithm is in a better accord with some empirical algorithms such as Brown, Young ones and et al., and also in a good agreement with ZT and other algorithms at low wind speed. This new improved algorithm will be suitable not only for low wind speed retrieval, but also for high wind speed retrieval. Better accuracy and effectiveness of wind speed retrieval can also be obtained.
机译：考虑到白帽和泡沫对脉冲受限雷达高度计的影响，提出了一种改进的海面风速反演算法。首先，建立四层介电模型以模拟海-气界面。其次，基于已建立的模型，计算了在13.5 GHz处被雾滴和泡沫覆盖的海面的微波反射率。这些计算结果表明，在高海况下，雾滴和泡沫的影响对于海表风速的获取不可忽略。最后，与Zhao提出的解析算法以及基于三层介质模型的一些计算结果进行了比较，提出了一种改进的海面风速反演算法。在高风速下，改进算法与布朗，Young等人的一些经验算法更好地吻合，并且在低风速下与ZT和其他算法有很好的一致性。这种新的改进算法不仅适用于低风速检索，还适用于高风速检索。还可以获得风速检索的更好的准确性和有效性。

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