Automatic calibration of magnetic compasses

Details Automatic calibration of magnetic compasses Automatic calibration of magnetic compasses

G - Physics

01

C

G01C 17/38 (2006.01)

Patent

CA 2133313

2133313 9320407 PCTABS00027 Automatic correction of hard-iron and soft-iron distortion in a magnetic compass is achieved by storing a set of measured magnetic field values for different discrete directions of the compass relative to an estimated origin. Values are interpolated for the directions not yet measured to provide a set of measured and interpolated values defining a substantially eliptical locus of the sensed magnetic field vector (ET). New coordinates for the estimated origin are derived and the measured values are adjusted to take account of changes in the estimated origin. The heading is corrected for displacement of the origin due to hard-iron effect and for ellipticity of the locus due to soft-iron effects.

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