Spatial signal error and precise point positioning evaluation of Galileo high accuracy service

The high accuracy service (HAS) of the Galileo system uses E6B signals to broadcast free precision satellite orbit, clock deviation and code deviation correction information to users around the world, which is of great significance in the field of high-precision real-time satellite applications. Evaluating the spatial signal error and precise point positioning performance is an important prerequisite for using HAS well. Based on the HAS orbital clock products from December 1 to 31, 2023, the root mean square errors (RMSE) of the Galileo satellite orbit products were 4.16 cm, 8.42 cm and 7.62 cm in the radial (R), tangential (A) and normal (C) directions, and 4.52 cm, 9.99 cm and 7.07 cm in GPS, respectively, while the standard deviation (STD) of the Galileo clock products was 0.16 ns and 0.26 ns for GPS. Precise point positioning (PPP) was carried out based on the observation data of 10 stations in Europe. The results show that the positioning accuracy of Galileo in the east (E), north (N) and zenith (U) directions is 6.44 cm, 4.65 cm and 11.36 cm, GPS is 7.42 cm, 5.78 cm and 12.04 cm, and the joint positioning is 4.11 cm, 3.10 cm and 7.56 cm, respectively. The results indicate that HAS can meet the high-precision positioning requirements.