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RF tag reader for accurate position determination

  • US 9,366,756 B2
  • Filed: 12/06/2008
  • Issued: 06/14/2016
  • Est. Priority Date: 12/06/2008
  • Status: Active Grant
First Claim
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1. A method of determining an RF tag position, comprising:

  • receiving a first response signal from a first antenna;

    receiving a second response signal from a second antenna;

    generating a sum signal based on the first and second response signals;

    generating a difference signal based on a difference between the first and second response signals; and

    generating a position detection signal responsive to a determination of a transition of a phase difference between the generated sum signal and the generated difference signal.

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