Multiple Transmitters
Multiple time sources may be combined to derive a more accurate time synchronization sources. This is what is done in satellite navigation systems such as the Global Positioning System. GPS, Galileo and GLONASS satellite navigation systems have a caesium or rubidium atomic clock on each satellite, referenced to a clock or clocks on the ground. Some navigation units can serve as local time standards, with a precision of about one microsecond (µs). The recent revival and enhancement of the terrestrial based radio navigation system, LORAN will provide another multiple source time distribution system.
Read more about this topic: Radio Clock
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