Synchronization of clocks in a satellite communication network b

Details Synchronization of clocks in a satellite communication network b Synchronization of clocks in a satellite communication network b

1993-10-29

1995-03-28

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

3701041, 455 132, H04J 306, H04L 708

Patent

active

054024242

ABSTRACT:
In a satellite communication network, a reference station simultaneously announces a reference time of a reference clock once in a predetermined duration of time to all terrestrial stations of the network. In each terrestrial station which comprises a local clock, a packet forming arrangement, a data extracting arrangement for extracting a local time datum from a packet received from a different terrestrial station, and a calculation unit for calculating a propagation delay time between the different terrestrial station and the terrestrial station under consideration by subtracting from the local time datum a current time indicated by the local clock when the local time datum is extracted, a time setting arrangement sets the current time at a sum of the local time datum and a constant preassigned to the terrestrial station in question. The constant is preliminarily decided by calculating a distance on the earth between the terrestrial station and the reference station based on their longitudes and latitudes, calculating a physical length of a communication link by using the distance, and calculating a time necessary for electromagnetic waves to travel the physical length.

REFERENCES:
patent: 4607257 (1986-08-01), Noguchi
patent: 4688216 (1987-08-01), Saburi
patent: 4689787 (1987-08-01), Hotta
patent: 4800560 (1989-01-01), Aoki et al.
patent: 4947451 (1990-08-01), Nawata

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