摘要
给出顾及高阶电离层延迟改正的双差定位模型,探讨中国区域VTEC的时空变化规律,分析高阶电离层延迟对L_3观测值的影响。利用41个陆态网测站2015年全年的GNSS数据,基于Bernese 5.2软件的双差定位技术,系统研究高阶电离层延迟对中国区域双差定位的影响及其时空分布规律。结果表明,高阶电离层延迟对中国区域双差定位的影响与测站网型结构相关,明显存在0.5 a的周期变化,影响年均值大小为0～2 mm,且具有方向性差异,对高纬度测站的影响有向北偏移趋势,对低纬度测站的影响有向南偏移趋势。
First,based on the double-differenced positioning mathematical model and the VTEC temporal–spatial distribution of China region,we analyze the influence of higher-order ionospheric delay on L 3 observation.Second,to investigate the temporal-spatial distribution characteristics of the higher-order ionospheric effect on GNSS double-differenced positioning in China region,GNSS data from 41 CMONOC stations spanning the year 2015 are processed based on the double-differenced positioning technology of BERNESE GNSS software version 5.2.Numerical results show that the influence of high-order ionospheric delay on double-differenced positioning in China region is related to the distribution of the selected stations,and there are obvious semi-annual variations and directional difference.With high latitude sites moving north and low latitude sites moving south,the size of the annual averages are up to 2 mm.
作者
周要宗
匡翠林
窦邵华
ZHOU Yaozong;KUANG Cuilin;DOU Shaohua(School of Geosciences and Info-Physics,Central South University,932 South-Lushan Road,Changsha 410083,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2019年第5期506-510,527,共6页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41774040)~~
关键词
高阶电离层延迟
双差定位
陆态网
TEC
higher-order ionospheric delay
double-differenced positioning
CMONOC
TEC
