IGS电离层产品在双向时间频率传递中的应用

摘要

The ionosphere errors are corrected in Two-way satellite time and frequency transfer (TWSTFT) using the ionosphere data provided by IGS. The ionosphere total electron content(TEC) is released by IGS at fixed time and geographic grid. The TEC of pierce point at requisite time is calculated by spatial four grids interpolation algorithms and temporal two linear interpolation algorithms. Then it is used to TWSTFT corrected after some processing. The results show that the ionosphere effect on C-band is about (0 ~ 0. 5 ) ns range. It is must be considered for time comparison at sub-nanosecond level. The ionosphere product provided by IGS is suit TWSTFT ionosphere correction. It has the advantages of simple method, low cost and high accuracy.%利用IGS组织提供的全球电离层资料对卫星双向时间频率传递中的电离层误差进行修正.IGS提供特定时刻、固定经纬度网格点上的电离层总电子含量.对该电离层资料首先进行空间四点网格内插,然后利用双线性内插得到电离层穿刺点所需时刻的总电子含量,最后将得到电离层数据经过处理用于双向时间频率传递修正.结果表明:电离层对C波段的影响在(0～0.5)ns范围内,这对亚纳秒量级的时间比对是必须考虑的.IGS提供的电离层产品适合应用于双向时间频率传递,具有方法简单、准确度高和价格低廉等特点.