IGU星历应用于三级GNSS控制网的精度分析

The Accuracy Analysis of IGU Ephemeris Applied to Level 3 GNSS Control Network

全国三级GNSS大地控制网数据处理使用的星历是IGS精密星历，但IGS精密星历的获取需要测后两个星期左右，不能实时获得，满足不了应急保障的需要。本文分别采用IGS精密星历、IGR快速星历、IGU超快速星历对三级GNSS控制网点进行数据处理，并对平差结果及精度进行比较分析，结果表明，IGU超快速星历可应用于三级GNSS控制网数据处理，满足应急保障的需要。

The IGS precise ephemeris was used in Level 3 GNSS control network data processing. However, it could not be obtained in real time, and generally about two weeks later instead, which failed to satisfy the need of emergency support. In this paper, IGS precise ephemeris, IGS rapid ephemeris and IGU super rapid ephemeris were used respectively to process the Level 3 GNSS control network data, and a comparative analysis of the adjustment result and accuracy was made. The result showed that IGU super rapid ephemeris could be used in Level 3 GNSS control network data processing and satisfied the requirement of emergency support.