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Method and apparatus for determining a geomagnetic field by using a compass and method and apparatus for determining an azimuth angle of a moving object using the same

  • US 20050183275A1
  • Filed: 02/04/2005
  • Published: 08/25/2005
  • Est. Priority Date: 02/04/2004
  • Status: Active Grant
First Claim
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1. A method of determining a geomagnetic field by using a compass, comprising:

  • defining an allowable magnetic field range used to determine a valid geomagnetic region;

    calculating a magnitude of a magnetic field in a geomagnetic-field validity test region by using a compass; and

    if the magnitude of the magnetic field is within the allowable magnetic field range, determining that the geomagnetic-field validity test region is the valid geomagnetic region, and if not, determining that there is applied an external magnetic field disturbance.

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