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RFID Tag Movement Determination

  • US 20100156651A1
  • Filed: 12/19/2008
  • Published: 06/24/2010
  • Est. Priority Date: 12/19/2008
  • Status: Active Grant
First Claim
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1. A method of detecting movement of a RFID tag comprising:

  • transmitting a plurality of RF signals from at least one RFID reader to the RFID tag;

    receiving at least two modulated backscattered signals from the tag in response to the transmission of signals;

    comparing the at least two backscattered signals to one another; and

    detecting movement of the RFID tag based on the comparison.

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