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

Claim 0:
1. A calibration system for a magnetometer having an unknown gain, comprising:
at least one calibration coil affixed relative to the magnetometer;
at least one driver configured for actuating the at least one calibration coil at a known actuation strength and at a calibration frequency outside of a linear operating range of the magnetometer, such that the at least one calibration coil generates a calibrating magnetic field of a known amplitude at the magnetometer;
memory storing 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;
at least one processor configured for:
acquiring a measurement of the calibrating magnetic field reported by the magnetometer;
recalling the roll-off gain error of the magnetometer from the memory;
computing a product of the known amplitude of the calibrating magnetic field at the magnetometer and the recalled roll-off gain error of the magnetometer;
computing a ratio of an amplitude of the acquired calibrating magnetic field measurement reported by the magnetometer and the computed product; and
determining the unknown gain of the magnetometer at the reference frequency at least partially based on computed ratio.