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Methods and apparatus for automatic magnetic compensation

  • US 7,146,740 B2
  • Filed: 02/23/2005
  • Issued: 12/12/2006
  • Est. Priority Date: 12/30/2002
  • Status: Active Grant
First Claim
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1. A method for characterizing distortions in the earth'"'"'s magnetic field caused by a vehicle, a magnetic detection device affixed to the vehicle, said method comprising:

  • repeatedly measuring the distorted magnetic field utilizing the magnetic detection device;

    obtaining a heading of the vehicle axes with respect to the earth at a time corresponding to each magnetic field measurement;

    receiving undistorted earth magnetic field data for the vicinity of the vehicle relative to the earth at the time of each magnetic field measurement; and

    utilizing the magnetic field measurements, a true heading of the vehicle, and the undistorted earth magnetic field data to characterize distortions caused by one or more of the vehicle and magnetic detection device errors.

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