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Method of automatic continuous calibration for an electric compass

  • US 6,651,003 B2
  • Filed: 07/30/2001
  • Issued: 11/18/2003
  • Est. Priority Date: 07/30/2001
  • Status: Active Grant
First Claim
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1. An autocalibration method for use with an electronic compass in a vehicle, said method including the steps of:

  • initializing variables;

    retrieving sensor readings from at least two axis;

    updating calibration based on said sensor readings;

    calculating a raw azimuth wit calibration adjusted sensor readings;

    adjusting said raw azimuth by a declination angle;

    filtering said raw azimuth with a previously filtered azimuth to obtain a filtered azimuth;

    updating a first heading from said filtered azimuth; and

    determining if a display needs said updated first heading transferred thereto.

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