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System for item and orientation identification

  • US 6,621,410 B1
  • Filed: 10/02/1999
  • Issued: 09/16/2003
  • Est. Priority Date: 08/26/1996
  • Status: Expired due to Fees
First Claim
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1. A method for determining an identity of a responder, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the method comprising:

  • providing a first grid antenna having a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;

    for a multiplicity of cells of the first grid, detecting a first signal from the reference resonant circuit;

    determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;

    determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;

    for cells of the set, detecting a respective second signal from each resonant circuit of the plurality in accordance with the offset;

    associating a respective cell of the set to each respective second signal; and

    determining the identity of the responder in accordance with positional relationships among the associated cells.

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