北斗全频段GNSS-R水位反演研究  

Research on BeiDou full-band GNSS-R water level inversion

作　　者：符平贵 匡翠林[1] 楚彬 FU Pinggui;KUANG Cuilin;CHU Bin(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Hunan Institute of Geomatics Sciences and Technology,Changsha 410007,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]湖南省测绘科技研究所,长沙410007

出　　处：《全球定位系统》2023年第3期52-56,92,共6页Gnss World of China

基　　金：湖南省自然资源科技计划(湘自资科20230168CH)。

摘　　要：北斗三号卫星导航系统(BDS-3)拥有丰富的频段数据,使得该系统在全球卫星导航反射测量(GNSS-R)领域具有广阔的应用前景.本文系统地开展了北斗全频段GNSS-R水位反演研究,首先对比了频谱分析和非线性拟合两种算法在水位反演中的性能,结果表明非线性拟合的整体精度优于频谱分析;然后针对反演结果中存在的各种误差,引入Savitzky-Golay滤波算法去噪,数值表明去噪前后的结果与实测水位之差的均方根误差(RMSE)平均降低了7.4 cm,且北斗全频段的反演精度与GPS L5相当.China's BeiDou-3(BDS-3)has abundant frequency band data,which makes the system promising for application in the field of Global Navigation Satellite System Reflectometry(GNSS-R).In this paper,we systematically carry out the study of BDS-R water level inversion,firstly,we compare the performance of two algorithms of spectral analysis and nonlinear fitting in water level inversion,and the results show that the overall accuracy of nonlinear fitting is better than that of spectral analysis;then,we introduce Savitzky-Golay filtering algorithm to denoise the inversion results for various errors,and the numerical values show that the difference between the results before and after denoising and the measured water level The average RMSE of the difference between the results before and after denoising and the measured water level is reduced by 7.4 cm,and the inversion accuracy of the full frequency band of BeiDou is comparable to that of GPS L5.

关 键 词：GNSS-R 水位反演 北斗卫星导航系统(BDS) 频谱分析 非线性拟合 Savitzky-Golay滤波 

分 类 号：P228.4[天文地球—大地测量学与测量工程]