中国区域CODE全球电离层地图精度分析  

Accuracy Assessment of CODE GIM in China

作　　者：来愈 姚宜斌[1] 张良[1] LAI Yu;YAO Yibin;ZHANG Liang(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079

出　　处：《测绘地理信息》2021年第6期8-12,共5页Journal of Geomatics

基　　金：国家重点研发计划(2016YFB0501803);国家自然科学基金(41574028)。

摘　　要：电离层延迟是精密单点定位的主要误差源,双频用户可利用组合观测值消除其影响,单频用户只能利用电离层模型对其加以改正。因此电离层模型的精度对单频精密单点定位(single-frequency precise point positioning,SF-PPP)的精度至关重要。为分析欧洲轨道确定中心(Center Orbit Determination Europe,CODE)提供的全球电离层地图(global ionospheric map,GIM)在中国区域内的精度,在不同纬度范围内选取25个均匀分布的陆态网基准站,从STEC(slant total electron content,STEC)精度及单频动态定位精度两个角度对CODE GIM进行精度评估。结果表明STEC均方根(root mean square,RMS)7天内的平均值为6.38 TECU,应用CODE GIM进行单频动态精密单点定位的精度在水平方向达到亚米级,高程方向达到米级,在高纬度地区CODE GIM精度更高。Ionospheric delay is the dominant error source of Precise Point Positioning(PPP),it can be eliminated by combined observations for dual-frequency users,but single-frequency users can only modify it by applying ionospheric models.Therefore,the accuracy of ionospheric models is of vital importance to Single-Frequency PPP(RF-PPP).To evaluate precision of Global Ionospheric Map(GIM) produced by Center Orbit Determination Europe(CODE) in China,25 uniformly distributed stations with different latitude of Crustal Movement Observation Network of China are chosen,and the evaluation of CODE GIM is conducted by the accuracy of STEC and of single-frequency kinematic PPP.Results show that the average value of Root Mean Square(RMS) for STEC is 6.38 TECU,single-frequency kinematic PPP with CODE GIM can reach an accuracy of sub-meter in horizon and meter in vertical,and the accuracy of CODE GIM perform better in high latitude.

关 键 词：欧洲轨道确定中心(CODE) 全球电离层地图(GIM) 单频精密单点定位(SF-PPP) 电离层延迟 

分 类 号：P228[天文地球—大地测量学与测量工程]