Galileo status: orbits, clocks, and positioning
Galileo status: orbits, clocks, and positioning
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DOI：
10.1007/s10291-016-0566-5
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发表时间：
2017-04
期刊：
影响因子：
4.9
通讯作者：
P. Steigenberger;O. Montenbruck
中科院分区：
文献类型：
--
作者：
P. Steigenberger;O. Montenbruck
欧洲全球导航卫星系统伽利略即将宣布初步服务。目前的星座共有12颗现役卫星，其中4颗属于第一代在轨验证卫星，另外8颗为全作战能力(FOC)卫星。虽然第一对FOC卫星的发射异常导致了椭圆轨道，但这些卫星可以用于科学应用，而不受相关限制。自常规传输开始以来，广播轨道和时钟的质量有了显著改善，达到了30亿厘米的空间信号测距误差。如果应用适当的太阳辐射压力模型，科学界产生的精密轨道产品的精度可达到约5000厘米。后者对于评估时钟稳定性也很重要，因为轨道误差被映射到表观时钟。利用九颗伽利略卫星的广播轨道和时钟进行双频单点定位，这些卫星迄今已被宣布健康，已经能够达到几米的精度。只有伽利略的精确单点定位在静态模式下使用日常解决方案接近2厘米的精度。
The European Global Navigation Satellite System Galileo is close to declaration of initial services. The current constellation comprises a total of 12 active satellites, four of them belonging to the first generation of In-Orbit Validation satellites, while the other eight are Full Operational Capability (FOC) satellites. Although the first pair of FOC satellites suffered from a launch anomaly resulting in an elliptical orbit, these satellites can be used for scientific applications without relevant limitations. The quality of broadcast orbits and clocks has significantly improved since the beginning of routine transmissions and has reached a signal-in-space range error of 30 cm. Precise orbit products generated by the scientific community achieve an accuracy of about 5 cm if appropriate models for the solar radiation pressure are applied. The latter is also important for an assessment of the clock stability as orbit errors are mapped to the apparent clock. Dual-frequency single point positioning with broadcast orbits and clocks of nine Galileo satellites that have so far been declared healthy already enables an accuracy at a few meters. Galileo-only precise point positioning approaches a precision of 2 cm in static mode using daily solutions.