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

Claim 14:
15. The calibration method of claim 14,
wherein the magnetometer is a vector magnetometer comprising a plurality of scalar magnetometers having a plurality of unknown gains, such that the calibrating magnetic field has a plurality of directional components of known amplitudes at the plurality of scalar magnetometers of the vector magnetometer, and the calibrating magnetic field measurement reported by the magnetometer comprises a plurality of directional components of the calibrating magnetic field measurement reported by the plurality of scalar magnetometers of the vector magnetometer;
wherein the calibration frequency is outside of linear operating ranges of the plurality of scalar magnetometers;
wherein computing the product of the known amplitude of the calibrating magnetic field at the magnetometer and the roll-off gain error of the magnetometer comprises computing a plurality of products of the known amplitudes of the plurality of directional components of the calibrating magnetic field at the plurality of scalar magnetometers and a plurality of roll-off gain errors of the plurality of scalar magnetometers;
wherein computing the ratio of the amplitude of the calibrating magnetic field measurement reported by the magnetometer and the computed product comprises computing a plurality of ratios between the plurality of directional component measurements of the calibrating magnetic field reported by the plurality of scalar magnetometers of the vector magnetometer and the plurality of computed products; and
wherein determining the unknown gain of the magnetometer comprises determining the plurality of unknown gains of the plurality of scalar magnetometers of the vector magnetometer at least partially based on the computed plurality of ratios.