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System and method for position determination of objects

  • US 7,864,633 B2
  • Filed: 04/13/2009
  • Issued: 01/04/2011
  • Est. Priority Date: 04/09/2002
  • Status: Expired due to Term
First Claim
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1. A method of determining the position of a transmitter unit comprising the steps of:

  • transmitting from the transmitter unit an FSK-encoded acoustic signal;

    receiving said signal at a first detector unit;

    receiving said signal at a second detector unit connected to the first detector unit by a network;

    comparing the signal strength received by the first detector unit with that received by the second detector unit; and

    determining from said comparison an estimate of the position of the transmitter unit.

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