Method of calibrating a three-axis magnetometer

Details Method of calibrating a three-axis magnetometer Method of calibrating a three-axis magnetometer

1998-03-10

2000-10-10

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Calibration

324247, 702 92, G01R 3500, G01R 3302, G01C 1738, G01P 2100, G06F 1900

Patent

active

061305340

ABSTRACT:
A method of calibrating a three-axis magnetometer is provided. In accordance with the method, calibration is effected by first establishing a three-axis magnetic field simulator having a center position portion. Suitable measures are taken to substantially compensate for the earth's magnetic field at least at that center position portion. A three-axis magnetometer is then disposed in the magnetic field simulator and successively actuated in predetermined manner to generate a set of measured parameter values. The measured parameter values are normalized using a predetermined standard output factor, and a square pre-calibration matrix C is generated from the normalized measured parameter values. An inverse matrix operation is thereafter performed upon the pre-calibration matrix C to generate a square calibration matrix D having a plurality of coefficients respectively indicative of orthonormal compensation coefficients. This square calibration matrix D is then applied to a subsequent measurement of the magnetometer to generate a corresponding compensated measurement.

REFERENCES:
patent: 5117375 (1992-05-01), Worcester et al.

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