Magnetic compass system for a vehicle

  • US 4,862,594 A
  • Filed: 11/04/1987
  • Issued: 09/05/1989
  • Est. Priority Date: 11/04/1987
  • Status: Expired due to Fees
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First Claim
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1. The method of finding the heading of a vehicle with a compass which includes a compass frame, a compass magnet on a rotor which is mounted for rotation on said frame so that it seeks to orient the polar axis of the magnet with the local magnetic field and which includes a reference line defined on the rotor having a predetermined offset angle, other than zero, relative to the polar axis of the magnet, said vehicle having a direction reference axis which has a known angular relation with the direction of the vehicle, said compass frame having an orientation axis extending perpendicular to the axis of rotation of said rotor, said method comprising the steps of:

  • fixedly mounting said compass frame on said vehicle with said orientation axis in a known angular direction relative to said direction reference axis,turning the rotor between one angular position in which the reference line is in alignment with the orientation axis and another angular position in which the polar axis of the rotor is aligned with the local magnetic field,measuring the angular value of the turning motion between said angular positions,and obtaining a value for said heading by adding or subtracting said angular value of turning motion, depending upon the direction of the turning motion, to or from the offset angle to obtain the vehicle heading with reference to the magnetic north direction.

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