The navigation data contain all the parameters that enable the user to position. They are stored on board each satellite with a validity duration and broadcast worldwide by all the satellites of the Galileo constellation. These are the 4 types of data needed to perform positioning:
- Ephemeris which are needed to indicate the position of the satellite to the user receiver
- Time and clock correction parameters which are needed to compute pseudo-range
- Service parameters which are needed to identify the set of navigation data, satellites, and indicators of the signal health
- Almanac which are needed to indicate the position of all the satellites in the constellation with a reduced accuracy
hai ,
i would like to know the ephemeris sources of galileo .can you please provide me the required info
thanks in advance
Hi Sravan,
The European GNSS Service Centre (GSC) provides the reference orbits and technical parameters for each satellite on the following link: http://www.gsc-europa.eu/system-status/orbital-and-technical-parameters
For a more precise data you can access Celestrak website: https://celestrak.com/NORAD/elements/galileo.txt