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Method and apparatus for electromagnetic position and orientation tracking with distortion compensation employing modulated signal

  • US 6,624,626 B2
  • Filed: 06/04/2002
  • Issued: 09/23/2003
  • Est. Priority Date: 11/01/1999
  • Status: Expired due to Fees
First Claim
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1. In an AC tracking system of the type wherein an electromagnetic field from a source is received by one or more sensors to determine the position and orientation of an object within a volume of interest, a method of minimizing electromagnetic distortion arising from induced eddy currents, comprising the steps of:

  • modulating the field;

    demodulating the field detected by the sensors; and

    performing a spectral analysis on the demodulated signal to distinguish between the direct, source-to-sensor response and the response due to the eddy currents; and

    determining the position and orientation of the object in accordance with the direct, source-to-sensor response.

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