Current almanac
The latest almanac can be downloaded from the following table.
Historical Records of almanacs
The most recent almanacs can be downloaded from the following table. Should you need an older almanac, please raise a request through the GSC helpdesk (option: Request on demand products).
Almanac parameters
The following table provides a description of the different parameters included in the Galileo almanac.
Parameter |
Field in XML file |
Definition |
Units |
---|---|---|---|
SVID |
SVID |
Satellite ID (1 constellation of 36 satellites) |
dimensionless |
Δ(a 1/2) |
aSqRoot |
Difference with respect to the square root of the nominal semi-major axis (29 600 km) |
meters 1/2 |
e |
ecc |
Eccentricity |
dimensionless |
δi |
deltai |
Inclination at reference time relative to i0 = 56º |
semi-circles* |
Ω0 |
omega0 |
Right ascension |
semi-circles* |
. |
omegaDot |
Rate of right ascension |
semi-circles/s* |
ω |
w |
Argument of perigee |
semi-circles* |
M0 |
m0 |
Satellite mean anomaly at reference time |
semi-circles* |
af0 |
af0 |
Satellite clock correction bias “truncated” |
s |
af1 |
af1 |
Satellite clock correction linear “truncated” |
s/s |
IODa |
iod |
Almanac Issue Of Data |
dimensionless |
t0a |
t0a |
Almanac reference time |
s |
WNa |
wna |
Almanac reference Week Number. WNa term is a Modulo 4 binary representation of the Galileo System Time Week Number. |
week |
SVstatus** |
statusE5a statusE5b statusE1B |
Satellite signal health status |
dimensionless |
* Note that the ‘semi-circle’ is not a SI unit but can be converted as: 1 semi-circle = π radian
** The F/NAV almanac transmitted by the E5a-I component contains the signal health status (E5aHS) coded on 2 bits. The I/NAV almanac transmitted by the E5b-I and E1-B components contains both signal health status (E5bHS) and (E1-BHS) coded on 2 bits each.