| Jury, H L, 1973, Application of Kalman Filter to Real-Time Navigation using Synchronous Satellites, Proceedings of the 10th International Symposium on Space Technology and Science, Tokyo, 945—952 | Since global GPS sites are constructed and monitored by different institutions all over the world, there are many different data center locations |
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| The omni-directional antenna at each site, acting much like a car radio antenna, picks up the satellite signals and transmits them to the site receiver as electric currents | The third part of the system is the data center |
The first segment of the system consists of 24 satellites, orbiting 20,000 km above the Earth in 12-hour circular orbits.
20| 2003 45 21 27704 2003-010A IIR NAVSTAR 53 USA 175 E2 21 | Amos, Jonathan February 12, 2019 |
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| 2001 54 18 26690 2001-004A IIR NAVSTAR 51 USA 166 B1 29 | 2003 56 16 27663 2003-005A IIR NAVSTAR 52 USA 168 D3 31 |
1992 32 1 22231 1992-079A IIA NAVSTAR 32 USA 91 C5 13.
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