Galileo高精度定位服务实时精密单点定位性能分析

Performance analysis of real-time precise point positioning with Galileo high accuracy service

针对目前Galileo高精度定位服务(HAS)处于初始服务阶段,服务性能尚不明确的的问题,该文选择了全球范围内的40个测站并从收敛时间以及定位性能方面进行分析。结果表明,静态模式下使用HAS产品,Galileo、GPS和GPS+Galileo均有50%以上的测站能在20 min内完成收敛;动态模式下Galileo有50%以上的测站在20 min以内完成收敛。在静态模式下,使用HAS的GPS定位精度在E方向和U方向较差,分别为4 cm和4.3 cm;在动态模式下,当使用HAS时,Galileo在高程方向相对于GPS有较大的提升,平面方向也有2 cm以上的提升。实验表明,使用Galileo HAS时,在静态模式下的平均收敛时间短于20 min,动态模式下短于36 min,并且静态模式下能够提供厘米级的定位精度,能够满足实时高精度定位需求。

Aiming at the problem that Galileo high accuracy positioning service(HAS)is in the initial service stage and the service performance is still unclear,40 stations worldwide were selected and analyzed in terms of convergence time and positioning performance in the paper.The results showed that more than 50%of the Galileo,GPS and GPS+Galileo stations could complete convergence within 20 min when using the HAS product in static mode,and more than 50%of the Galileo stations could complete convergence within 20 min in kinematic mode.In static mode,the positioning accuracy of GPS using HAS was poorer in the E and U directions,which were 4 cm and 4.3 cm,respectively;in kinematic mode,when using HAS,Galileo had a greater improvement in the elevation direction compared with GPS,and there was also an improvement of more than 2 cm in the plane direction.The experiments showed that when using Galileo HAS,the average convergence time was shorter than 20 min in static mode and shorter than 36 min in kinematic mode,and the static mode could provide centimeter-level positioning accuracy,which meet the real-time high-precision positioning requirements.