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Near field electromagnetic positioning system and method

  • US 7,298,314 B2
  • Filed: 10/04/2004
  • Issued: 11/20/2007
  • Est. Priority Date: 08/19/2002
  • Status: Active Grant
First Claim
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1. A system for determining a position of an object, said system comprising:

  • a transmitter located with said object, said transmitter producing a beacon signal;

    a plurality of receivers for receiving said beacon signal;

    each of said receivers of said plurality of receivers having a respective known receiver position;

    each of said receivers of said plurality of receivers comprising;

    means for receiving a first signal characteristic of said beacon signal;

    means for receiving a second signal characteristic of said beacon signal; and

    a comparison unit for comparing said first signal characteristic and said second signal characteristic to generate a first comparison result;

    said system for determining a position further comprising;

    a database comprising calibration data, said calibration data representing a plurality of positions associated with respective predicted comparison results; and

    a control processor,said control processor finding among said predicted comparison results of said calibration data a minimal error point, said minimal error point being a predicted comparison result of said respective predicted comparison results matching most closely said first comparison result, said position of said object being determined based on said position associated with said minimal error point.

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