| GPS
| GLONASS
| BeiDou
|
Number of sat. | 31 | 24 | 14 (5 GEO, 5 IGSO, 4 MEO) |
Number of nominal satellite | 24 | 24 | 35 (5 GEO, 3 IGSO, 27 MEO) |
Number of orbital plan | 6 | 3 | 3 (MEO) |
Inclinaison plan | 55˚ | 65˚ | 55˚ (MEO & IGSO) |
Altitude (km) | 20,180 | 19,100 | 21,530 (MEO) |
Orbital period | 11 h 58 m | 11 h 16 m | 12 h 50 m (MEO) |
Time scale | GPST UTC(USNO) | UTC(SU) | BDT UTC(NTSC) |
Coord. system | WGS 84 | PZ 90 | CGCS 2000 |
Ephemerides | Kepler Elements and temporal variations | Geocentric Cartesian Coord. and temporal variations | Kepler Elements and temporal variations |
Ephemeris update | every 2 h | every 30 min | every 1 h |
Message length | 12.5 min | 2.5 min | 12 min (and 6 min) |