利用多模卫星系统仿真数据建立区域电离层模型  

Analysis of Regional Ionosphere Model Building by Multi-GNSS

作　　者：何倩倩[1] 张瑞[2] 刘杨[1] 

机构地区：[1]武汉大学卫星导航定位工程技术研究中心,武汉430079 [2]武汉大学测绘学院,武汉430079

出　　处：《导航定位学报》2013年第3期74-78,共5页Journal of Navigation and Positioning

摘　　要：目前已有的全球卫星导航系统包括美国的全球定位系统系统,俄罗斯的格洛纳斯卫星导航系统,欧盟的伽利略卫星导航系统以及我国的北斗卫星导航系统。对于导航用户而言,采用多模全球卫星导航系统可以显著增加测站可视卫星、观测值的数量,并能改善卫星分布,更加有利于区域电离层模型的建立。因为目前全球导航卫星系统尚未全面建成,无法获得多模系统实测数据,本文使用卫星工具软件包仿真全球定位系统、格洛纳斯卫星导航系统、北斗卫星导航系统的双频观测值,采取多种策略构建中国区电离层球谐函数模型,并对区域模型结果进行分析。仿真结果表明:对于中国区域,利用全球卫星导航多系统观测值建立中国区域电离层球谐函数模型的平均精度要优于单一系统,我国北斗卫星导航系统单系统观测值的建模精度与全球卫星导航多系统建模精度相近,模型误差最大时仅有实际延迟量的14%,二者均优于全球定位系统单系统观测值的建模精度,其模型误差最大可达20%,而格洛纳斯卫星导航系统单系统观测值建模精度最差,模型误差最大时达实际延迟量的35%。GNSS systems contain GPS,GLONASS,GALILEO and BDS etc.For the navigation users,using them together is very helpful to increase the number of the satellite that can be seen,and improves satellite distribution.So it plays a significant role in building area ionosphere model.Since GNSS systems have not been fully completed,the dual-frequency observations of GPS,GLONASS,GALILEO and BDS should be simulated,based on which the model of the ionosphere spherical harmonics is built,also the regional model results are analyzed,and some conclusion remarks are given finally.The simulation result shows that the mean accuracy of the ionosphere spherical harmonics model building by GNSS systems is better than that of single system in China.The model errors of BDS and GNSS are similar,which only account for 14% of the actual delay maximum,and better than that of GPS which is 20% maximum.While the result of GLONASS is the worst,the model error of which can even account for 35% of the actual delay.

关 键 词：全球卫星导航系统 电离层延迟 观测值仿真 卫星工具软件包 球谐函数模型 

分 类 号：P228.41[天文地球—大地测量学与测量工程]