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Method, apparatus, and medium for calibrating compass sensor in consideration of magnetic environment and method, apparatus, and medium for measuring azimuth using the compass sensor calibration method, apparatus, and medium

  • US 20080071492A1
  • Filed: 08/23/2007
  • Published: 03/20/2008
  • Est. Priority Date: 09/20/2006
  • Status: Active Grant
First Claim
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1. A method of calibrating a compass sensor in consideration of a magnetic environment, the method comprising:

  • (a) acquiring magnetic force data by rotating the compass sensor 360 degrees, the compass sensor comprising a biaxial magnetometer;

    (b) fitting the acquired magnetic force data to an ellipse function;

    (c) transforming the acquired magnetic force data and the ellipse function into a circle which is centered on an origin; and

    (d) calculating a distortion factor based on an inclination of a major axis of the ellipse function or the acquired magnetic force data to a horizontal axis, the distortion factor indicating the degree to which a magnetic field is distorted.

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