ELECTRONIC COMPASS
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Accused Products
Abstract
A method for determining a null drift (Hx0, Hy0) of an electronic compass includes steps for ascertaining first magnetic field strengths in a first coordinate system of the electronic compass via a triaxial magnetic sensor; for calculating from the first magnetic field strengths incline-compensated second magnetic field strengths (200) in a second coordinate system (x, y) parallel to the Earth'"'"'s surface; for adjusting a trial function (210) to the incline-compensated second magnetic field strengths (200); and for determining a null drift (Hx0, Hy0) from the adjusted trial function (210). A method for operating the electronic compass includes steps for calculating an incline-compensated magnetic field strength (Hx, Hy) in the second coordinate system (x, y) from a first magnetic field strength measured by the magnetic sensor, for calculating a zero-point-corrected third magnetic field strength (Bx, By) by subtracting the null drift (Hx0, Hy0) determined by the above-described method from the incline-compensated second magnetic field strength (Hx, Hy); and for calculating an azimuth angle by which an axis (x) of the second coordinate system (x, y) deviates from a north-south direction.
6 Citations
28 Claims
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1-14. -14. (canceled)
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15. A method for determining a null drift (Hx0, Hy0) of an electronic compass, comprising:
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ascertaining a plurality of first magnetic field strengths (Mx′
, My′
, Mz′
) in a first coordinate system (KS′
) of the electronic compass via a triaxial magnetic sensor;calculating a plurality of incline-compensated second magnetic field strengths (Hx, Hy) in a second coordinate system (KS) parallel to the Earth'"'"'s surface from the plurality of first magnetic field strengths (Mx′
, My′
Mz′
);adjusting a trial function to the plurality of incline-compensated second magnetic field strengths (Hx, Hy); and determining a null drift (Hx0, Hy0) from the adjusted trial function. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification