Control Segment GPS Master Control and Monitor Network

The Master Control facility is located at Schriever Air Force Base (formerly Falcon AFB) in

Colorado. These monitor stations measure signals from the SVs which are incorporated into

orbital models for each satellites. The models compute precise orbital data (ephemeris) and

SV clock corrections for each satellite. The Master Control station uploads ephemeris and

clock data to the SVs. The SVs then send subsets of the orbital ephemeris data to GPS

receivers over radio signals.

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