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海面风速是海洋环境的重要参数,微波辐射计是卫星监测海面风速的重要手段。通过微波辐射计SSM/I(Special Sensor Microwave/Imager)亮温与浮标实测风速建立的匹配数据集,利用人工神经网络构建海面风速反演模型。比较不同模型的反演效果,得出七通道单参数神经网络模型SANN(Single-parameter Artificial Neural Network)反演的效果和浮标实测风速较为接近,均方根误差RMSE(Root Mean Square Error)为1.40m/s。因此选择该模型反演全球的月平均风速,并将反演结果与NOAA产品风速比较。结果表明:两者在整体分布和纬度平均上非常接近,均方根误差为1.03m/s。可见,该算法用于海面风速反演还是可行的。研究亮点:提出用微波辐射计SSM/I刈辐型亮温与浮标实测数据进行匹配,可以减小人为误差。比较不同神经网络模型,发现七通道单参数模型效果要优于其他结构模型,然后选择该模型反演全球风速,效果较好,因此在不需要深究海面微波发射和传输的微观机制的前提下,可以为以后的微波辐射计反演海面风速提供参考。
Sea surface wind speed is an important parameter of the marine environment. The microwave radiometer is an important means of monitoring the wind speed of the sea surface by satellite. The matching dataset established by the brightness of the microwave sensor SSM / I (Special Sensor Microwave / Imager) and the actual measured wind speed of the buoy was used to build the sea surface wind velocity inversion model by artificial neural network. Comparing the inversion results of different models, the results of SANN (Single-parameter Artificial Neural Network) inversion of seven-channel single-parameter neural network model are close to those of the measured buoy. The root mean square error (RMSE) is 1.40 m / s. Therefore, the model was chosen to retrieve the global average monthly wind speed and compare the inversion result with the NOAA product wind speed. The results show that the two are very close to the overall distribution and the average latitude, the root mean square error is 1.03m / s. Obviously, the algorithm is feasible for sea surface wind inversion. Research highlights: It is proposed to use the microwave radiometer SSM / I m radiation bright temperature and the buoy measured data to match, can reduce human error. Comparing different neural network models, it is found that the seven-channel single-parameter model is better than other structural models, and then the model is selected to inverse the global wind speed and the effect is better. Therefore, under the premise of not needing to study the micro-mechanism of sea surface microwave transmission and transmission, It can provide a reference for the subsequent microwave radiometer inversing the wind speed over the sea surface.