| Abstrakt: |
The European Galileo High Accuracy Service (HAS) was officially declared as initial service status on January 24, 2023, which can provide freely and openly accessible real-time precise satellite orbit, clock and code bias products to global users through the Galileo E6B signals. We conducted initial performance assessment of the HAS GPS and Galileo satellite orbit and clock products collected with a commercial off-the-shelf software-defined receiver platform located in Zhengzhou, China, from March 11 to 20, 2023. The results show that the average availability of HAS GPS and Galileo satellite orbit and clock products is 86.9% and 91.7%, respectively. The average accuracies of HAS GPS satellite orbit products are 0.037, 0.106 and 0.057 m for the radial, along-track and cross-track directions, while those for HAS Galileo are 0.032, 0.094 and 0.065 m, respectively. Meanwhile, the average precision of HAS satellite clock products for GPS and Galileo are 0.24 and 0.18 ns, respectively. After that, Precise Point Positioning experiments are conducted with GPS and Galileo observations from all the International GNSS Service Multi-GNSS Experiment stations (over 380 stations). It indicates that the average static positioning accuracies with HAS GPS products are 2.80, 1.53 and 2.18 cm in the east, north and up directions, while those for HAS Galileo products are 1.40, 1.79 and 2.31 cm, respectively. On the other hand, the average kinematic positioning accuracies with HAS GPS products are 7.94, 5.55 and 13.39 cm in the east, north and up directions, while those for HAS Galileo products are 8.08, 5.28 and 12.43 cm, respectively. It is therefore concluded that the HAS products can support decimeter-level positioning accuracy in both static and kinematic modes, which will support various emerging real-time precise positioning applications on a global scale. [ABSTRACT FROM AUTHOR] |
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