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Object monitoring, locating, and tracking method employing RFID devices

  • US 7,423,535 B2
  • Filed: 08/05/2005
  • Issued: 09/09/2008
  • Est. Priority Date: 08/26/2004
  • Status: Active Grant
First Claim
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1. A method for monitoring one or more objects each having an RFID device associated therewith, said method comprising:

  • transmitting at least two messages at different respective power levels from the RFID device, wherein each of the at least two messages includes information uniquely identifying the RFID device and information representing the power level at which the message is transmitted;

    relaying the at least two messages transmitted by each RFID device to a processor; and

    processing the relayed messages for determining the location of each RFID device, said processing comprising;

    processing the unique identifying information and the power level information from each relayed message for associating the relayed messages from each RFID device and the power level thereof, andselecting the relayed messages from a particular RFID device that are at the lowest power level that produces at least two corresponding relayed messages for determining the location of that particular RFID device and its associated object therefrom.

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