Patent ID: 11915085
Assignee: ZEBRA TECHNOLOGIES CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. A method for detecting stray radio frequency identification (RFID) tag read events at a venue using an RFID tag tracking system, the RFID tag tracking system comprising (i) a first RFID transceiver arrangement configured to interrogate RFID tags disposed within a lane of a venue, wherein the first RFID transceiver arrangement is configured to have a signal range that extends over at least a first portion of the lane; (ii) a second RFID transceiver arrangement configured to interrogate RFID tags disposed within the venue, wherein the second RFID transceiver arrangement is configured to generate a beam in a plurality of directions relative to the second RFID transceiver arrangement, wherein at least one of the directions extends over at least a second portion of the lane, the second portion of the lane being proximate to the first portion of the lane; and (iii) a controller operatively connected to the first RFID transceiver arrangement, the second RFID transceiver arrangement, the method comprising:
detecting, via the first RFID transceiver arrangement, a first plurality of read events respectively corresponding to a first set of RFID tags;
detecting, via the second RFID transceiver arrangement, a second plurality of read events respectively corresponding to a second set of RFID tags, wherein the second plurality of read events occurred within a threshold time from the first plurality of read events;
determining, by the controller, that a particular RFID tag is included in both the first set of RFID tags and the second set of RFID tags;
based upon the read events for the particular RFID tag detected via the second RFID transceiver arrangement, determining, by the controller, that the particular RFID tag is not located in the second portion of the lane; and
deleting, by the controller, the particular RFID tag from the first set of RFID tags.