顾及电离层延迟高阶项改正的精密单点定位  

Influence of Higher-order Ionospheric Delay Correction on Static Precise Point Positioning

作　　者：张小红[1] 任晓东[1] 郭斐[1] 

机构地区：[1]武汉大学测绘学院,武汉市珞喻路129号430079

出　　处：《武汉大学学报（信息科学版）》2013年第8期883-887,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(41074024);国家创新研究群体科学基金资助项目(41021061)

摘　　要：给出了顾及电离层二阶项和三阶项延迟改正的非差精密单点定位(precise point positioning,PPP)模型。利用全球均匀分布的38个IGS跟踪站,对比分析了不同纬度、不同电离层环境下电离层高阶项延迟对GNSS观测值以及静态PPP解算的影响。实验结果表明,电离层高阶项延迟对低纬度地区的静态PPP的定位结果影响最为显著,可达3～5mm;而对高、中纬度的影响则较小,分别为亚mm和mm级水平;且其影响主要体现在南北(N)方向,呈向南偏移的趋势,尤其是在低纬度地区,该分量可达3mm以上,是E方向和U方向的2～3倍。此外,电离层活跃程度对定位结果也有一定影响,其活跃期影响值相对于平静期影响值高20%～30%。We modified the un-differenced precise point positioning （PPP） mathematical mod- el considering the second- and third-order ionospheric correction. The influence of the high- er-order ionospheric corrections on both GNSS observations and static PPP are analyzed with respect to aspects of site location and ionospheric environment by using a globally distributed network which is composed of 38 IGS tracking stations. Numerical experimental results show that, higher-order ionospheric influences on the observation as well as static PPP at low-latitude regions are more significant than that of mid- and high-latitude regions. For static PPP, the influence in low-latitude regions （〈30°） reaches about 3-5mm, and is only a sub-millimeter in other regions （〉30°）. Furthermore, the impact is mainly visible in the di- rection of North and South direction, showing a southward migration trend, especially at the lower latitudes where the influence value is likely to be more than 3 mm, 2 to 3 times that of the East and Up components. The level of ionospheric activity may also have impact on posi- tioning results, and the influence during active periods is about 20-30% higher than that of quiet periodd.

关 键 词：电离层高阶项延迟 精密单点定位 精度 纬度 

分 类 号：P228.41[天文地球—大地测量学与测量工程]