结合小波变换和WOA算法的GNSS-IR海面高度反演  

GNSS-IR Sea Level Height Inversion Combining Wavelet Transform with WOA Algorithm

作　　者：刘鹏 陈天伟 刘晋 贾相苹 LIU Peng;CHEN Tianwei;LIU Jin;JIA Xiangping(College of Geomatics and Geoinformation,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Spatial Information and Geomatics,Guilin 541004,China)

机构地区：[1]桂林理工大学测绘地理信息学院,广西桂林541004 [2]广西空间信息与测绘重点实验室,广西桂林541004

出　　处：《无线电工程》2023年第4期860-867,共8页Radio Engineering

基　　金：国家自然科学基金(41861050);广西自然科学基金(2017GXNSFAA198308)。

摘　　要：基于岸基全球卫星导航系统(Global Navigation Satellite System, GNSS)干涉反射测量(GNSS Interferometric Reflectometry, GNSS-IR)技术进行海平面高度估计已经成为海面高度监测的新兴方法。针对该方法存在的信号分离不佳和反演精度需提高的问题,提出利用小波变换改进直反射信号分离,结合三次样条函数和鲸鱼算法对改进反射模型进行海面高度反演。为了验证改进方法的有效性,对2个不同沿海GNSS测站的信噪比(Signal to Noise Ratio, SNR)数据进行实验,并与验潮仪实测数据比较。实验结果表明,改进方法相较于非线性最小二乘法的海平面反演精度有明显提高,改进方法反演结果与验潮仪数据具有较好的一致性,瑞典Onsala的均方根误差达到了1.72 cm,相关系数为0.99;西班牙Barcelona的均方根误差达到了2.2 cm,相关系数为0.95。Sea level height estimation based on Interferometric Reflectometry of shore-based Global Navigation Satellite System(GNSS-IR)has become a new method of sea level height monitoring.To solve the problems of poor signal separation and the need to improve the inversion accuracy of this method,wavelet transform is used to improve the direct reflection signal separation,combined with cubic spline function and whale algorithm to inverse the sea level height of the improved reflection model.In order to verify the effectiveness of the improved method,the Signal-to-Noise Ratio(SNR)data of two different coastal GNSS stations are tested and compared with the measured data of tide gauge.The experimental results show that the sea level inversion accuracy of the improved method is significantly improved compared with the nonlinear least square method.The inversion results of the improved method are in good agreement with the tide gauge data.The root mean square error of Onsala in Sweden is 1.72 cm,and the correlation coefficient is 0.99.The root mean square error of Barcelona in Spain is 2.2 cm,and the correlation coefficient is 0.95.

关 键 词：全球卫星导航系统干涉反射测量 海平面高度 信噪比 WOA算法 小波变换 

分 类 号：P228[天文地球—大地测量学与测量工程]