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Motion tracking techniques for RFID tags

  • US 8,325,019 B2
  • Filed: 09/13/2010
  • Issued: 12/04/2012
  • Est. Priority Date: 09/13/2010
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • receiving a sequence of readings from a radio frequency identification (RFID) tag;

    determining a received signal strength indicator (RSSI) for each reading in the sequence of readings;

    generating a first sequence of RSSIs based upon the RSSIs determined for the sequence of readings; and

    determining motion-related information for the RFID tag based upon the first sequence of RSSIs and reference information, the motion-related information comprising information indicative of a path of motion of the RFID tag and information indicative of a direction of motion of the RFID tag along the path, the reference information comprising a plurality of RSSI vectors, each vector comprising a sequence of RSSIs and being associated with information indicative of a path of motion and a direction of motion;

    wherein determining the motion-related information comprises;

    determining, from the plurality of RSSI vectors, a RSSI vector having a smallest Euclidian distance to the first sequence of RSSIs; and

    outputting a path of motion and a direction of motion associated with the determined RSSI vector as the path of motion and the direction of motion of the RFID tag.

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