京津地区电离层改正的时空变化

SPATIAL AND TEMPORAL VARIATIONS OF IONOSPHERIC DELAY CORRECTION IN BEIJING-TIANJIN AREA

在GPS的广域、局域增强导航系统和RTK的应用中 ,电离层延迟改正的准确度都是决定测量定位结果能否达到精度要求的重要因素。利用中国地壳运动观测网络在京津地区的十三陵、房山、蓟县 3个基准站 2 0 0 1年的部分观测资料 ,研究了京津地区GPS电离层延迟改正随时间和空间的变化 ,并在此基础上讨论了差分导航和RTK定位的电离层延迟改正的更新率和基准站的布设问题。

The accuracy of ionospheric delay correction is an important factor that affects the positioning precision in the applications of GPS in wide area, local area navigation systems and RTK.By taking some observational data observed in 2001 at three feducial stations located in The Ming-Tombs, Fangshan and Jixian in Beijing-Tianjin region,which are a part of the Crustal Movement Observation Network Of China(CMONOC), as examples the spatial and temporal variations in corrections of ionosheric delay in the region are studied.On the basis of the results of these examples the interval for updating velocity of ionospheric delay corrections and the distribution of feducial stations are discussed.