- Global positioning triangulates an unknown location on Earth by
correlating time signals from multiple satellites in orbit
- NAVSTAR launched by USAF from 1978 to 1994
- NAVSTAR constellation employs 24 satellites in 12 medium earth
orbits staggered such that five to eight are overhead anywhere on
Earth at any time
- NAVSTAR operates in the 1.2 and 1.5 GHz microwave bands
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