中国区域内单Galileo卫星导航系统定位性能评估

Evaluate on positioning performance of Galileo-only satellite system in China region

随着欧盟伽利略(Galileo)卫星系统的全面完成组网建设,其在中国区域定位性能需进一步进行评估。本文利用中国及周边区域的6个多全球导航卫星系统(GNSS)实验系统(MEGX)测站分别从卫星可视数、定位位置精度因子(PDOP)值和静态精密单点定位技术(PPP)方面对单Galileo卫星系统在中国区域内的定位性能进行了研究。结果表明:当卫星高度角设置为7°时,24 h内各测站可接收到的平均卫星数约为7.3颗,定位PODP约为2.2,能较好地满足中国区域全天候单点定位;对于单天静态解和4 h静态解,无论是非差非组合还是无电离层组合,均可实现在水平方向小于2.3 cm,高程方向小于4.5 cm的定位精度,且6个测站的平均收敛时间约为36.4 min;根据卫星可视数和PDOP值分布可知,中国的东部、中部和南部卫星可视数和PDOP值最好,Galileo定位服务性能在该区域相对更优。

With the full completion of the network construction of the European Union Galileo satellite system(Galileo),its regional positioning performance in China needs to be further evaluated.In this paper,6 multi-global navigation satellite system(GNSS)experiment(MGEX)stations are used to study the positioning performance of Galileo-only satellite system in China from the aspects of satellite visibility,position dilution of precision(PDOP)and static precise point positioning(PPP)respectively.The results show that when the elevation angle is set to 7°,the average number of satellites available to each station in 24 hours is about 7.3 and the PODP is about 2.2,which can basically meet the all-weather single-point positioning in China.For daily static solution and 2-hour static solution,the positioning accuracy in horizontal direction is less than 2.3 cm and vertical direction is less than 4.5 cm,and the average convergence time of 6 stations is about 36.4 min.According to the distribution of satellite visibility and PDOP value,the eastern,central and southern China have the best satellite visibility and PDOP values,and the Galileo positioning service performance is relatively better in this region.