Spatial signal error and precise point positioning evaluation of Galileo high accuracy service
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摘要: Galileo高精度定位服务(high accuracy service，HAS)利用E6B信号向全球用户播发免费精密卫星轨道、钟差和码偏差改正信息，在卫星高精度实时应用领域有重要意义. 评估其空间信号误差及精密单点定位(precise point positioning，PPP)性能是用好HAS的重要前提. 基于2023年12月1日至31日的HAS轨道钟差产品进行评估测试，Galileo卫星轨道产品在径向(R)、切向(A)和法向(C)的均方根误差(root mean square error，RMSE)分别为3.24 cm、7.40 cm和6.85 cm，GPS分别为4.52 cm、8.19 cm和6.71 cm；Galileo钟差产品的标准差(standard deviation，STD)为0.16 ns，GPS为0.26 ns. 基于欧洲10个测站PPP的实验结果表明：Galileo在E、N、U方向的定位精度分别为6.44 cm、4.65 cm和11.36 cm，GPS分别为7.42 cm、5.78 cm和12.04 cm，联合定位分别为4.11 cm、3.10 cm和7.56 cm，HAS可以满足高精度定位需求.
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关键词:
- Galileo高精度定位服务(HAS) /
- 可用性分析 /
- 空间信号误差 /
- 精密单点定位(PPP)
Abstract: 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. -
表 3 空间信号测距精度RMSE
cm 系统 $ \mathrm{S}\mathrm{I}\mathrm{S}\mathrm{R}{\mathrm{E}}_{\mathrm{o}\mathrm{r}\mathrm{b}} $ $ \mathrm{S}\mathrm{I}\mathrm{S}\mathrm{R}\mathrm{E} $ Galileo 3.39 4.85 GPS 4.31 6.54 
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表 4 HAS产品Galileo、GPS和二者联合定位结果
cm 系统 E N U Galileo 6.44 4.65 11.36 GPS 7.42 5.78 12.04 联合定位 4.11 3.10 7.56
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