Method of calibrating a compass heading
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United States of America Patent
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-
Jul 4, 1989
Grant Date -
N/A
app pub date -
Feb 29, 1988
filing date -
Feb 29, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for compensating for pitch and roll misalignment in 3-axis magnetometer-type compasses wherein the magnetometer during factory calibration is subjected to magnetic fields corresponding to at least two different latitudes, and correction coefficients for the measured x and y (or horizontal) magnetic field components are derived from signals derived from the z axis (or vertical) magnetic field sensor. The correction coefficients are permanently stored in the compass to provide a heading corrected for internal pitch and roll misalignment of the magnetometer field measuring elements relative to the true vertical that would normally cause errors in azimuth with changes in latitude. No further correction or misalignment is necessary in the field for compass use.
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