GNSS-R海面风速反演技术研究

Research on GNSS-R sea surface wind field Information Inversion technology

利用全球卫星导航系统反射信号技术(GNSS-R)反演海面风速时,得到的双基雷达横截面积由于几何因素的影响不能直接用来反演风速.针对这一问题,对功率校准后的数据进行几何校正,在分析全球卫星导航系统(GNSS)海面反射信号特征的基础上,分析了几何因素对风速反演的影响,对双基雷达横截面积和有效散射区域进行校正,得到相应反射点的反射信号功率;最后对所求得的反射信号参数进行仿真验证.实验结果表明,海面风速反演的均方根误差为2.61 m/s,反演风速与真实风速的相关系数为0.57,校正后的归一化双基雷达横截面积能够有效地反演海面风速.

Due to the influence of geometric factors,when using the spaceborne GNSS-R to retrieve the sea surface wind speed,the cross-section of the double-base radar obtained cannot be used directly to retrieve the wind speed.The influence of geometric factors on wind speed inversion is studied on the basis of analyzing the characteristics of GNSS sea surface reflection signals.After correcting the cross-sectional area and effective scattering area of the double-base radar,the reflected signal power of the corresponding reflection point is obtained.Finally,these obtained reflection signal parameters are verified by simulation..The experimental results show that the root mean square error of sea surface wind speed inversion is 2.61 m/s,and the correlation between the inversion wind speed and the real wind speed is 0.75.The normalized double-base radar scattering power after correction can effectively retrieve the sea surface wind speed.