Method of calibrating a compass heading

Details Method of calibrating a compass heading Method of calibrating a compass heading

G - Physics

01

C

33/1

G01C 25/00 (2006.01) G01C 17/38 (2006.01)

Patent

CA 1299857

ABSTRACT A method for compensating for pitch and roll misalignment in 3-asis 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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