Patent ID: 7924162
Filing Date: 2011-04-12
Classification: G06K,H04W

Abstract:
1. A tag identification system comprising a tag reading apparatus and a plurality of tags, wherein: the tag reading apparatus has at least two antennas, wherein the apparatus transmits an interrogation signal within the coverage of each of the antennas; the plurality of tags sequentially pass by the coverage of each of the at least two antennas, each of the plurality of tags returning a reply to the at least two antennas in response to a received interrogation signal; and the tag reading apparatus includes a sequence determination unit which determines the sequence in which the plurality of tags pass by based on replies returned from the plurality of tags and received by the at least two antennas; wherein the tag reading apparatus further comprises a reply classification unit which classifies the replies received by each of the at least two antennas to determine whether the replies come from a single-region in which the received replies include only a reply returned from one of the plurality of tags or a multiple-region in which the received replies include replies returned from more than one of the plurality of tags, and sends the result of the classification to the sequence determination unit.