低风速海面毫米波辐射亮温半经验模型

海水的物理参数差异以及风场的作用使得不同海域在不同时间具有不同的毫米波辐射特性。基于船测的海面辐射亮温数据和大气向下辐射亮温数据，文中建立了海面毫米波散射亮温修正系数模型和发射率计算模型，给出了利用风速、风向、温度、海水盐度等计算海面亮温的基本思路。在此基础上，开展了W波段海面辐射测量试验对模型进行验证，对比结果表明，计算值和实测值间的差异约为1%。

Semi-empirical Model of Millimeter Wave Radiation Brightness Temperature of Sea Surface with Low Wind Speed

Due to the difference in physical parameters of seawater and the effect of wind field, different sea areas have different millimeter wave radiation characteristics at different time. In this paper, based on the sea surface radiant brightness temperature data measured by the ship and the atmospheric downward radiant brightness temperature data, the sea surface millimeter wave scattering brightness temperature correction coefficient model and the emissivity calculation model are established, and the basic idea of calculating the brightness temperature of the sea surface by using wind speed, wind direction, temperature, sea water salinity, etc. is given. Based on this, a W-band sea surface radiation measurement experiment is carried out to verify the model. The comparison result shows that the difference between the calculated value and the measured result is about 1%.