岸基GNSS反射信号有效波高反演研究

Retrieval of Significant Wave Height Using Coastal GNSS Reflectometry

在岸基全球导航卫星系统(Global Navigation Satellite System,GNSS)反射信号观测几何关系和GNSS直反射信号协同处理结构的基础上,提出了反射信号相关通道动态适配策略。在所设岸基仿真条件下,5个反射相关通道可接收超过90%以上场景的所有GPS反射信号,为岸基反射信号接收机反射通道数目的设计提供了参考。从理论和试验2个角度,研究论证岸基场景下不同频点或不同系统的GNSS反射信号,建立统一的有效波高反演模型。验证结果表明,利用定义的归一化有效反射信号(Interferometric Complex Field,ICF)相关时间,GPS L1和L5信号通过同一反演模型,均方根误差分别为0.30,0.28 m。

Based on the observation geometry of coastal GNSS-R and the processing structure of the reflected GNSS signals,a dynamic ajusting approach for reflection correlation channel is proposed.The results show that under the coastal simulation scenario when the number of reflection correlation channels is 5,the reflected GPS signals from 90%visible satellites for the down-looking antenna can be processed,which provides a reference for the design of the number of reflection channels of shore based reflection signal receiver.Through theory and experiment,it is demonstrated that for signals with different frequencies or from different GNSS systems,the same retrieval model can be used to retrieve the significant wave height.The experimental results show that the root mean square errors are respectively 0.30 and 0.28 m using the normalized effective ICF correlation time of GPS L1 and L5 signals.