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Angle of position object location system and method

  • US 7,170,412 B2
  • Filed: 08/31/2004
  • Issued: 01/30/2007
  • Est. Priority Date: 08/31/2004
  • Status: Active Grant
First Claim
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1. An object location system for locating an object having an RFID tag, the object location system comprising:

  • an RFID reader, the RFID reader transmitting a plurality of transmitted signals to the RFID tag and receiving a plurality of backscatter-modulated signals from the RFID tag; and

    an angle calculator, the angle calculator determining an angle of position of the RFID tag from the backscatter-modulated signals, wherein the angle calculator determines the angle of position of the RFID tag by determining a sum of the backscatter-modulated signals received at two antennas and a difference of the backscatter modulated signals received at the two antennas, and wherein the object location system determines object location using the angle of position of the RFID tag.

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