GNSS-R海面风场反演模型仿真分析

Simulation analysis on GNSS-R ocean surface wind field retrieval model

针对传统海面风场探测技术存在复杂度高、成本大、范围小及GNSS-R海面风向探测方法匮乏的问题,提出一种GNSS-R前后向几何配置结合的风场反演模型:给出海面微波信号的散射功率模型,并仿真分析前向、后向散射信号对风速和风向的敏感性;定义时延一维相关功率曲线的相关功率和为观测量,仿真观测量与风速、风向之间的关系,然后建立风场反演模型。仿真结果表明,利用前向散射信号反演风速的均方根误差为2.02m/s,利用后向散射信号能够有效反演风向。

Aiming at the problem that there exists high complexity,high cost,small scope,and the lack of reliable detection means on GNSS-R ocean surface wind for traditional detection technology of ocean surface wind field,the paper proposed a GNSS-R wind field Inversion model combining forward and backward scattering geometric configuration:the scattering power model of the microwave signal on ocean surface was expounded,and the sensitivity of the forward and backward scattering signals to the wind speed and wind direction was simulated;moreover,the sum of correlation power of the one-dimensional correlation power curve was defined as the observation,and then the relationship among the wind direction,wind speed and the observation were simulated,finally the wind field inversion model was given.Results showed that the root-mean-square-error of the wind speed would be 2.02 m/s by using the forward scattered signal,and the backscattering signal could effectively retrieve the wind direction.