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Tag communication apparatus, control method for tag communication apparatus, computer readable medium for tag communication control and tag communication control system

  • US 7,573,418 B2
  • Filed: 06/20/2005
  • Issued: 08/11/2009
  • Est. Priority Date: 06/22/2004
  • Status: Active Grant
First Claim
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1. An apparatus configured to communicate with an RFID (Radio Frequency Identification) tag through a radio wave, said apparatus comprising:

  • a plurality of antenna elements, each of which is configured to receive the radio wave from the RFID tag;

    a direction estimating section configured to estimate an incoming direction of the radio wave from the RFID tag at each of the antenna elements thereby obtaining estimated directions;

    a power measuring section configured to measure a power of the radio wave received by each of the antenna elements, thereby obtaining a measured power ratio;

    a position calculating section configured to calculate a position of the RFID tag based on the estimated directions; and

    a power ratio estimating section configured to estimate a ratio of powers to be received by the antenna elements based on the calculated position of the RFID tag, as an estimated power ratio;

    wherein the position calculating section is configured to compare the measured power ratio with the estimated power ratio to verify the calculated position of the RFID tag.

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