Patent ID: 11872042
Assignee: HI LLC
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 6:
7. A signal acquisition unit, comprising:
a magnetometer having an unknown gain;
a calibration system configured for:
generating a calibrating magnetic field at a known amplitude at the magnetometer and at a calibration frequency outside of a linear operating range of the magnetometer;
acquiring a measurement of the calibrating magnetic field reported by the magnetometer;
computing a product of the known amplitude of the calibrating magnetic field at the magnetometer and a roll-off gain error of the magnetometer characterizing roll-off effects of a gain of the magnetometer at a reference frequency within the linear operating range of the magnetometer and a gain of the magnetometer at the calibration frequency;
computing a first ratio of an amplitude of the calibrating magnetic field measurement reported by the magnetometer and the computed product; and
determining the unknown gain of the magnetometer at least partially based on computed first ratio; and
at least one processor is configured for computing a second ratio between an arbitrary magnetic field measurement reported by the magnetometer and the determined gain of the magnetometer, and determining an amplitude of the arbitrary magnetic field at the magnetometer at least partially based on the computed second ratio.