Vehicle compass system with continuous automatic calibration

Details Vehicle compass system with continuous automatic calibration Vehicle compass system with continuous automatic calibration

2005-02-22

2005-02-22

Bennett, G. Bradley (Department: 2859)

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

C702S085000

Reexamination Certificate

active

06857194

ABSTRACT:
The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criteria. One such criterion is that the three data points define corners of a triangle that is substantially non-obtuse. When three data points have been obtained that define a triangle meeting this criterion, the processing circuit calculates a center point for a circle upon which all three data points lie by solving the equation x2+y2+Ax+By+C=0 for A, B, and C, using the coordinate values (x,y) for the three data points and defining the center point as (−A/2, −B/2).

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