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Method and device for synchronisation of distant clocks to a central clock via satellite

  • US 7,327,699 B1
  • Filed: 03/30/2000
  • Issued: 02/05/2008
  • Est. Priority Date: 03/30/1999
  • Status: Expired due to Term
First Claim
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1. A method for synchronizing a remote clock to a central clock, the method comprising the steps of:

  • providing a central clock and a remote clock at separate locations;

    connecting the central clock and the remote clock via a bi-directional, two-way satellite communication link;

    bi-directionally transmitting and receiving time signals between the central clock and the remote clock via a satellite;

    the central clock and the remote clock determining a measurement data,by the central clock determining a first time difference between the local time of the remote clock and the time of the central clock when the central clock receives a time signal carrying the local time of the remote clock, andby the remote clock determining a second time difference between the local time of the central clock and the time of the remote clock when the remote clock receives a time signal carrying the local time of the central clock;

    each of the central clock and the remote clock intermittently exchanging the measurement data and system related correction data including bi-directionally transmitting and receiving the determined first time difference and the determined second time difference between the central clock and the remote clock via the satellite; and

    synchronizing the remote clock in state and rate to the central clock based on the bi-directionally transmitted and received first and second time signals, on the measurement data including the bi-directionally transmitted and received first and second time differences and on system related corrections exchanged between the central and remote clocks.

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