实时GLONASS精密卫星钟差估计及实时精密单点定位

Real-Time GLONASS Precise Satellite Clock Corrections Estimation and Precise Point Positioning

研究非差实时GLONASS精密卫星钟差的估计方法,并将实时钟差应用于实时精密单点定位。采用自编软件,依据全球均匀分布的GNSS参考站实测数据,基于非差消电离层组合载波和伪距观测量,实现了GLONASS实时精密卫星钟差估计。实验结果表明,自主估计的实时GLONASS卫星钟差与ESA发布的最终精密钟差具有较好的一致性,互差优于0.5ns;用于实时精密单点定位,能够获得静态定位cm级精度,仿动态定位水平方向5～15cm、高程方向10～30cm的精度。

The algorithm of real-time GLONASS satellite clock corrections is investigated and the real- time satellite clock corrections are used for RT-PPP. Based on software developed by ourselves, un- differenced ionosphere-free phase and range observations collected from global GNSS stations are used to estimate real-time GLONASS clock corrections. The results show that the real-time GLONASS clock corrections are comparable with the ESA final precise clock corrections. The RMS of real-time clock is better than 0.5 ns with respect to the ESA final satellite clock. The accuracy of GLONASS RT-PPP is a centimeter in static mode, and better than 30 cm in simulated kinematic mode, when real- time satellite clock corrections are used.