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System and method for locating radio frequency identification tags

  • US 6,661,335 B1
  • Filed: 09/24/1999
  • Issued: 12/09/2003
  • Est. Priority Date: 09/24/1999
  • Status: Expired due to Fees
First Claim
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1. An asset management system, comprising:

  • a plurality of sensor arrays disposed at a plurality of different fixed locations in a building, each of said sensor arrays being capable of transmitting and receiving radio frequency signals;

    at least one transponder affixed to a moveable asset requiring management, said at least one transponder being configured to receive and transmit radio frequency signals;

    a processor executing a program capable of analyzing said radio frequency signals transmitted by said sensor arrays and deriving an estimate of the position of said at least one transponder in relation to each of said sensor arrays, wherein said processor and program are disposed within said at least one transponder; and

    a computer in data communication with said processor such that the location of said at least one transponder may be periodically stored within said computer.

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