实时GPS精密卫星钟差估计及实时精密单点定位

Real-time GPS Precise Satellite Clock Error Estimation and Precise Point Positioning

研究了GPS实时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IGS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GPS实时精密卫星钟差估计。试验结果表明,自主估计的实时卫星钟差与IGS发布的最终精密钟差具有较好一致性,互差优于0.2ns;用于实时精密单点定位,能够获得静态定位1~2cm、仿动态定位厘米级精度。

The algorithm of real-time precise satellite clock corrections was researched and the real-time satellite clock errors were used in real-time precise point positioning. Using the software developed by ourselves, the real- time GPS precise satellite clock error estimation was realized based on the measured data from the global IGS stations, the undifferenced ionosphere-free combination carrier and the pseudo-range observations. The results showed that the real-time satellite clock errors estimated by ourselves and the final precise clock errors issued by IGS have a good consistency with a mutual error better than 0.2ns.When the real-time satellite clock errors were used in real-time precise point positioning, the positioning accuracy was 1-2cm in static mode and better than 10cm in simulated kinematic mode.