伽利略卫星导航系统的初步性能评估

Initial assessment of GALILEO satellite navigation system

伽利略卫星导航系统是由欧盟和欧洲航天局联合打造的全球卫星导航系统。基于MGEX全球数据监测网的实测数据,对伽利略卫星导航系统的观测数据质量、单点定位和精密单点定位性能展开了评估。评估结果显示:目前伽利略系统导航卫星数较少,尚不具备全天时导航定位能力;伽利略系统多路径误差大小量级为分米级,E5频段信号的多路径效应最小,而E5b频段信号的多路径效应最为严重;一般情况下伪距单点定位平面精度可达5 m以内,高程精度可达10 m以内;动态精密单点定位平面精度可达5 dm以内,高程精度可达5 dm以内。

Galileo is a global navigation satellites system initiatively launched by the European Union and the European Space Agency. This paper carried out initial assessment on observation data quality, single point positioning and precise single point positioning performance of Galileo system based on a large number of measured data obtained from the MGEX. The assessment results show that： the Galileo system has a small number of navigation satellites and cannot provide all day long navigation at present. The pseudo range multipath of Galileo is in decimeter-level variation, the multipath effect of E5 band signal is the least, while the multipath effect of E5b band signal is the most serious. Normally, the horizontal and vertical accuracies of Galileo SPP are better than 5 m and 10 m respectively. In general, the horizontal and vertical accuracies of Galileo Kinematic-PPP are better than 5 dm and 5 dm respectively.