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GPS satellite ephemeris

  The usage and meaning of GPS satellite almanac:

  GPS satellite Almanac (Almanac) is contained in the fourth and the fifth frame of the navigation message and can be regarded as the simplified subset of the satellite ephemeris parameters. It broadcasts one time every 12.5 minutes, keeps alive for a week, and its lifelong can be extended to six months.

Main Usages:
1.Make the satellite code search with a definite purpose, avoid "searching star all blindly "
2. Find skeleton Doppler frequency shift of any satellite, assist frequency domain to search
Each variable meaning in Almanac (Almanac) data:
ID: the range of satellite PRN number is from 1 to 31
Health: zero represents signal available, non-zero unavailable
Eccentricity: orbit eccentricity
Time of Applicability(s): reference time of the almanac
Orbital Inclination(rad): orbital inclination
Rate of Right Ascen(r/s): ascending node ascension change rate
SQRT(A) (m 1/2): the square root of the semi-major axis orbit
Right Ascen at Week(rad): ascending node ascension
Argument of Perigee(rad): perigee depression angle
Mean Anom(rad): mean anomaly
Af0(s): satellite clock correction parameters (clock difference)
Af1(s/s): satellite clock correction parameters(clock speed)
Week: GPS weeks



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