北斗/GPS实时精密卫星钟差融合解算模型及精度分析

Estimation Model and Accuracy Analysis of Bei Dou/GPS Real-time Precise Satellite Clock Error Integrated Resolving

实时GNSS精密单点定位(PPP)技术必须使用实时的高精度卫星精密轨道和钟差。本文研究了精密卫星钟差融合解算模型及策略,并利用滤波算法实现了北斗/GPS实时精密卫星钟差融合估计算法。仿真实时试验结果显示:获得的北斗/GPS实时钟差与GFZ事后多GNSS精密钟差(GBM)的标准差在0.15 ns左右;使用该钟差进行GPS动态PPP试验,收敛后水平精度优于5 cm,高程精度优于10 cm;使用仿真实时钟差进行的北斗动态PPP与使用GFZ事后多GNSS精密钟差开展的试验相比精度相当,可实现分米级定位。

Real-time high-precise satellite orbit and clock products are needed in real-time GNSS precise point positioning（ PPP）. In this paper,Estimation model and strategy of multi-GNSS precise satellite clock integrated resolving are researched and Bei Dou/GPS real-time precise clock integrated estimation algorithm is realized by filter. Real-time simulation test results show： the STD accuracy of Bei Dou/GPS real-time clock estimated in this paper compared to GFZ multi-GNSS precise clock（ GBM） is about 0. 15 ns; horizontal accuracy after convergence of GPS kinematic PPP using simulation real-time clock products estimated in this paper is better than 5 cm and vertical accuracy is better than 10 cm,respectively; in Bei Dou kinematic PPP test,horizontal and vertical accuracy results are same as the results using GFZ multi-GNSS precise clock（ GBM） products,and the decimeter positioning can be realized.