The satellite ephemeris provides the position of that satellite, at a given time, in the spherical polar coordinate system of right ascension and declination. This data is updated every three hours.
A single ephemeris is applicable to all signals and frequencies of a specific satellite. With this data the user can compute the Earth-Centered, Earth-Fixed (ECEF) coordinates of the Space Vehicle’s (SV) antenna phase centre position at GST time.
The ephemeris for each Galileo satellite is composed of 16 parameters, which are:
- 6 keplerian parameters
- 6 harmonic coefficients
- 1 orbit inclination rate correction parameter
- 1 LAN rate correction parameter
- 1 mean motion correction parameter
- 1 reference time parameter t0e for the ephemeris data set
I am trying to get GALILEO NAV DATA in this website https://www.ngs.noaa.gov/UFCORS/, but they do not have this data,.
If you know any other source that can get GALILEO NAV DATA , please provide me!
Thank you very much.
Best regards,
Nate Duong.
I am looking for the same data and have had some luck with the IGS data products at http://mgex.igs.org/IGS_MGEX_Products.html. They link you to an ftp archive that updates weekly. I have only found sp3 files which provide XYZ satellite positions in a specified reference frame.
Alternatively, you can got to https://www.space-track.org/ and download the two-line element sets. The TLEs offer different Keplerian parameters than those given by the Galileo navigation messages, and with that I don’t know if TLEs offer the level of accuracy one would need for precise navigation but it may be good enough.
Best of Luck,
-IG
IGS is also providing with RINEX Nav. Messages which also contains ephemeris (among other data).
You can find hourly data in these servers. But make sure you are looking at a station that supports Galileo.
You have different servers available for this data
NASA: ftp://cddis.gsfc.nasa.gov/pub/gnss/data/hourly/2017/073/01/
ESA: ftp://gssc.esa.int/gnss/data/hourly/2017/