星间差分GRAPHIC观测量单频精密单点定位算法

Single-Frequency Precise Point Positioning Algorithm Based on Satellite Differential GRAPHIC Observables

提出了一种基于星间差分GRAPHIC观测量的单频精密单点定位算法,采用正反向滤波实现了静态和动态解算功能。该算法的优点是不需要外部电离层模型进行电离层延迟改正。采用4个IGS站7d的数据和一组机载GPS动态数据进行解算实验,结果表明:静态定位E,N和U方向的RMS分别为0.035,0.007和0.080m;动态定位E,N和U方向的RMS分别为0.117,0.122和0.180m。

An algorithm for single-frequency precise point positioning was proposed based on satellite differential GRAPHIC observables.By employing forward-backward filtering for data processing,the presented algorithm was applied to both static and kinematic applications.Experiments was carried out with airborne GPS data and static data collected at 4 stations of International GNSS Service（IGS）through day 210 to 216 in 2007.The results showed that static positioning RMS in ENU were 0.035,0.007 and 0.080 m,while kinematic positioning RMS in ENU were 0.117,0.122 and 0.180 m.