基于载波相位平滑伪距与精密单点定位获取的TEC在GNSS电离层层析中的对比分析  

Comparative analysis of TEC in GNSS ionospheric tomography based on carrier phase smoothing pseudo-distance and precise single point positioning

作　　者：李婷[1,2] 郑敦勇 苑鹏飞[1,2] 何畅勇 林东方 廖孟光 LI Ting;ZHENG DunYong;YUAN PengFei;HE ChangYong;LIN DongFang;LIAO MengGuang(College of Earth Sciences and Spatial Information Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;National and Local Joint Engineering Laboratory of Geospatial Information Technology,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学地球科学与空间信息工程学院,湘潭411201 [2]湖南科技大学地理空间信息技术国家地方联合工程实验室,湘潭411201

出　　处：《地球物理学进展》2024年第2期460-470,共11页Progress in Geophysics

基　　金：国家自然科学基金项目(42004025,42204037);湖南省自然资源科技计划(2022-07,2022-29);湖南省自然科学基金项目(2022JJ30254,2024JJ5142);湖南省教育厅基金项目(19C0744);广西高校中青年教师科研基础能力提升项目(2022KY0826);湖南省教育厅优秀青年项目(23B0470);湖南省自然资源厅科技项目(20240105CH)联合资助。

摘　　要：利用GNSS(Global Navigation Satellite System)建立电离层层析(Computerized Ionospheric Tomography,CIT)模型反演电离层的结构,并探测和研究电离层的活动及其变化规律是目前的研究热点,其中相位平滑伪距(Carrier Phase Smoothing Pseudorange,CPSP)和精密单点定位技术(Precise Point Positioning,PPP)是两种主要的电离层电子含量(Total Electron Content,TEC)获取方式,但这两种方法对电离层层析的性能影响,目前尚未有研究进行比较分析.有鉴于此,本文利用欧洲区域2017年9月7、8两日的GNSS数据,分别基于CPSP和PPP获取TEC进行电离层层析反演并分析比较其精度,这两种反演方法分别称为CPSP-CIT和PPP-CIT.其结果显示,CPSP-CIT与测高仪之间的RMSE均值为0.9292×10^(11)el/m^(3)、PPP-CIT与测高仪之间的RMSE均值为0.6915×10^(11)el/m^(3),可看出,相较于CPSP-CIT,PPP-CIT的精度提高了25.6%.为进一步验证上述结果的准确性,分别计算了CPSP-CIT、PPP-CIT与Swarm卫星数据的RMSE值,其结果显示CPSP-CIT、PPP-CIT与Swarm卫星数据之间的平均RMSE值分别为0.4774×10^(11)el/m^(3)和0.4275×10^(11)el/m^(3),可看出,以Swarm卫星数据为参考,PPP-CIT的精度相较于CPSP-CIT提高了10.5%.综上所述,PPP-CIT的反演精度高于CPSP-CIT,其反演结果更趋近实测数据.The ionosphere is an important part of the Sun-Earth space environment,which has important influence on the modern radio engineering system and human space activities.Therefore,the monitoring and research of the ionosphere have important scientific significance for understanding the Sun-Earth space environment,revealing the formation and change mechanism of the ionosphere,and improving the accuracy of navigation and positioning.Using GNSS(Global Navigation Satellite System)to establish Computerized Ionospheric Tomography(CIT)model to invert the ionospheric structure,and to detect and study the ionospheric activity and its change rule is the current research hotspot.Among them,Carrier Phase Smoothing Pseudorange(CPSP)and Precise Point Positioning(PPP)are two main methods for obtaining ionospheric Total Electron Content(TEC),but the effects of these two methods on the performance of computerized ionospheric tomography model have not been compared and analyzed.In view of this,this paper uses the GNSS data of September 7 and September 8,2017 in the European region to obtain TEC for computerized ionospheric tomography inversion based on CPSP and PPP,respectively,and compare their accuracy.These two inversion methods are called CPSP-CIT and PPP-CIT,respectively.The results show that the mean RMSE between CPSP-CIT and the altimeter is 0.9292×10^(11)el/m^(3),and the mean RMSE between PPP-CIT and the altimeter is 0.6915×10^(11)el/m^(3).It can be seen that compared with CPSP-CIT,the accuracy of PPP-CIT is 25.6%higher.To further verify the accuracy of the above results,RMSE values of CPSP-CIT,PPP-CIT and Swarm satellite data were calculated respectively.The results showed that the average RMSE values between CPSP-CIT,PPP-CIT and Swarm satellite data were 0.4774×10^(11)el/m^(3)and 0.4275×10^(11)el/m^(3),respectively.The result shows that swarm between satellite data,the PPP-CIT precision compared with CPSP-CIT was 10.5%higher.In conclusion,the inversion accuracy of PPP-CIT is higher than that of CPSP-CIT,and its inversio

关 键 词：电离层层析 相位平滑伪距 精密单点定位 电离层总电子含量 

分 类 号：P228[天文地球—大地测量学与测量工程]