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Inventory-cycle-based RFID tag location

  • US 10,061,950 B1
  • Filed: 11/20/2017
  • Issued: 08/28/2018
  • Est. Priority Date: 07/02/2015
  • Status: Active Grant
First Claim
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1. A method for a Radio Frequency Identification (RFID) synthesized-beam reader (SBR) system to estimate a location of an RFID tag, the method comprising:

  • transmitting a first inventorying RF wave in a first SBR beam;

    receiving a first nonzero number of responses from the RFID tag in the first SBR beam;

    determining a first success rate based on a first response count and a first opportunity metric associated with the first SBR beam;

    transmitting a second inventorying RF wave in a second SBR beam different from but overlapping the first SBR beam;

    receiving a second nonzero number of responses from the RFID tag in the second SBR beam;

    determining a second success rate based on a second response count and a second opportunity metric associated with the second SBR beam; and

    estimating the tag location within an overlapping portion of the first and second SBR beams based at least on a comparison between the first success rate and the second success rate.

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