Ephemeris

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
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