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Wireless position location and tracking system

  • US 7,312,752 B2
  • Filed: 10/18/2004
  • Issued: 12/25/2007
  • Est. Priority Date: 10/22/2003
  • Status: Active Grant
First Claim
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1. A method for real-time position location of an object within an indoor multiple floor facility, the method comprising:

  • generating at each of a plurality of network monitors a first plurality of measurements, the first plurality of measurements comprising data from a plurality of beacon emitters, each beacon emitter of the plurality of beacon emitters generating a radiofrequency signal, wherein the data comprises signal strength from each of the plurality of beacon emitters received by the network monitor, each of the plurality of network monitors attached to a wall outlet of the indoor multiple floor facility;

    wirelessly transmitting data of the first plurality of measurements from each of the plurality of network monitors to at least one of a plurality of access points utilizing a 802.11 communication link;

    generating at a tag of each object of a plurality of objects within the indoor multiple floor facility, a second plurality of measurements, the second plurality of measurements comprising signal strength from each of the beacon emitters received by the tag and identification data from a tag of each object of the plurality of objects;

    wirelessly transmitting data of the second plurality of measurements from the tag of each object of the plurality of objects to at least one of a plurality of network monitors using a 802.15.4 communication link;

    wirelessly transmitting data of the second plurality of measurements from at least one of the plurality of network monitors to at least one of a plurality of access points utilizing the 802.11 communication link;

    receiving at a location positioning engine through the plurality of access points data of at least one of the first plurality of measurements from each of the plurality of network monitors;

    receiving at the location positioning engine through the plurality of access points data of at least one of the second plurality of measurements from the tag of at least one of the objects of the plurality of objects;

    generating and continuously updating a real-time mapped space of a radiofrequency environment of the multiple-floor indoor facility based on the data of the first plurality of measurement utilizing a radial basis function; and

    generating a real-time position location in an X-Y-Z coordinate for at least one of the plurality of objects in accordance with the received data of the second plurality of measurements and the real-time mapped space of the radiofrequency environment of the multiple-floor indoor facility.

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