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Method, apparatus and system for synchronizing a cellular communication system to GPS time

  • US 20030109264A1
  • Filed: 12/12/2001
  • Published: 06/12/2003
  • Est. Priority Date: 12/12/2001
  • Status: Active Grant
First Claim
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1. An apparatus (10), comprising:

  • a) a cellular module (11), responsive to a portion of a downlink frame signal; and

    b) a main module (12), responsive to ranging signals from beacons (27) of a positioning system in which time is kept according to the predetermined time reference;

    the apparatus characterized in that;

    the cellular module (11) provides a trigger signal indicating the arrival of the portion of the downlink frame signal, and is further responsive to a signal indicating information for relating the instant at which the trigger signal is provided to a time value according to a predetermined time reference; and

    the main module provides the signal indicating the information for relating the instant at which the trigger signal is provided by the cellular module (11) to a time value according to the predetermined time reference;

    wherein the triggering signal is provided over a connection (29) between the cellular module (11) and the main module (12) constructed so that any delay between sending and receiving the triggering signal is known by the apparatus (10).

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