BDS/Galileo/GPS三频精密单点定位模型比较与分析

Comparison and analysis of BDS/Galileo/GPS triple-frequency precise point positioning models

为了进一步研究多系统三频精密单点定位(PPP)的性能,提出对其不同数学模型的定位性能进行评估比较:分析全球卫星导航系统(GNSS)原始观测方程中码硬件延迟的特性;然后合理参数化三频PPP中的多频码硬件延迟;最后给出北斗卫星导航系统(BDS)、全球定位系统(GPS)和伽利略卫星导航系统(Galileo)三系统组合的二种可估三频PPP函数模型和随机模型。实验结果表明:三频PPP相比于双频PPP,可以有效地改善定位精度及初始收敛时间,并提高定位结果的可靠性;三系统组合三频PPP静态定位在E、N和U方向的精度分别优于0.8、0.5和1.1 cm,动态定位分别优于1.4、1.0和2.9 cm;三系统组合三频PPP静态定位收敛时间优于21.7 min,动态定位收敛时间优于24.0 min。

In order to furhter study the performance of multi-system triple-frequency Precise Point Positioning(PPP),the paper proposed to evaluate the positioning of different triple-frequency PPP models:the characteristics of code hardware delay in Global Navigation Satellite System(GNSS)raw observation equations were analyzed;and the multi-frequency code hardware delay of the PPP was reasonably parameterized;finally two estimable triple-frequency PPP mathematics models were given for the combination of BeiDou navigation satellite System(BDS),Galileo navigation satellite system(Galileo)and Global Positioning system(GPS).Experimental result showed that:compared with dual-frequency PPP,triple-frequency PPP could effectively improve the positioning accuracy and shorten the initial convergence time,and enhance the reliability of positioning results;meanwhile,the static positioning accuracy on E,N and U directions for the triple-frequency PPP of BDS/Galileo/GPS scheme would be better than 0.8,0.5 and 1.1 cm,with the kinematic accuracy better than 1.4,1.0 and 2.9 cm,respectively;moreover,the convergence time of static and kinematic positioning for triple-frequency PPP of BDS/Galileo/GPS scheme would be better than 21.7 and 24.0 min respectively.