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Mobile station locating system and method

  • US 5,901,358 A
  • Filed: 07/15/1997
  • Issued: 05/04/1999
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Term
First Claim
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1. A wireless communications system having the ability to locate a remote station, said system comprising:

  • a plurality of base station units and at least one remote station;

    each of said base station units and said at least one remote station including transmitter, receiver and digital signal processing circuitry for establishing and maintaining communications within time slots of at least one over-the-air loop having a predetermined, expected duration;

    each of said base station units including processing circuitry for determining propagation delay times associated with signals received during a respective time slot of said at least one over-the-air loop, said propagation delay times being determined based at least in part upon a difference between said predetermined, expected duration of said at least one over-the-air loop and a measured duration of said at least one over-the-air loop; and

    said at least one remote station including processing circuitry for calculating distances to a plurality of said base station units based upon said propagation delay times.

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