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Location detection system and method with fingerprinting

  • US 9,335,399 B2
  • Filed: 03/09/2010
  • Issued: 05/10/2016
  • Est. Priority Date: 03/23/2009
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a location of a target device, the method comprising acts of:

  • providing a plurality of field devices configured to communicate with each other using signals having signal strength, in an area having a plurality of nodes and the target device;

    determining an expected signal strength of signals from each of the plurality of field devices at each of the plurality of nodes;

    associating each determined expected signal strength at each of the plurality of nodes with one of the plurality of field devices;

    for each of the plurality of field devices in communication with the target device;

    measuring a first actual signal strength from the field device at the target device;

    designating a portion of the nodes as valid nodes; and

    identifying one of the nodes designated as a valid node at which the measured first actual and the determined expected signal strengths agree as the location of the target device,wherein the portion of the nodes designated as valid nodes are only nodes having the expected signal strength for each of the field devices in communication with the target device being greater than or equal to the actual signal strength measured from the respective field device.

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