Magnetic heading reference
First Claim
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1. Means for correcting the northerly turning error of a magnetic compass on a vehicle comprising:
- means on said vehicle for generating a signal proportional to V sin φ
where V is the vertical component of the earth'"'"'s magnetic field at the location of the vehicle and φ
is the bank angle of the vehicle, andcoil means surrounding said compass and receiving said generated signal for generating a force proportional to V sin φ
on the needle of said compass in a direction opposite to the force on said needle caused by the northerly turning error.
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Abstract
This invention employs a magnetometer as a magnetic heading reference for a vehicle such as a small aircraft. The magnetometer is mounted on a directional dial in the aircraft in the vicinity of the pilot such that it is free to turn with the dial about the yaw axis of the aircraft. The invention includes a circuit for generating a signal proportional to the northerly turning error produced in the magnetometer due to the vertical component of the earth'"'"'s magnetic field. This generated signal is then subtracted from the output of the magnetometer to compensate for the northerly turning error.
16 Citations
4 Claims
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1. Means for correcting the northerly turning error of a magnetic compass on a vehicle comprising:
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means on said vehicle for generating a signal proportional to V sin φ
where V is the vertical component of the earth'"'"'s magnetic field at the location of the vehicle and φ
is the bank angle of the vehicle, andcoil means surrounding said compass and receiving said generated signal for generating a force proportional to V sin φ
on the needle of said compass in a direction opposite to the force on said needle caused by the northerly turning error. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeUnited States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
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Original AssigneeUnited States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
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InventorsGarner, Howell D.
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Primary Examiner(s)Woodiel, Donald O.
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Application NumberUS05/623,156Time in Patent Office481 DaysField of Search73/178 R, 33/356US Class Current73/178.00RCPC Class CodesG01C 17/30 Earth-inductor compassesG01C 17/38 Testing, calibrating, or co...
