A calibration system for a magnetometer having an unknown gain is disclosed. A calibration magnetic field is generated at a calibration frequency of a known amplitude at the magnetometer. A measurement of the calibrating magnetic field is reported by the magnetometer. A ratio of an amplitude of the calibration magnetic field measurement reported by the magnetometer and the known amplitude of the calibrating magnetic field at the magnetometer is computed. The unknown gain of the magnetometer is determined at least partially based on computed ratio.
SELF-CALIBRATION OF FLUX GATE OFFSET AND GAIN DRIFT TO IMPROVE MEASUREMENT ACCURACY OF MAGNETIC FIELDS FROM THE BRAIN USING A WEARABLE NEURAL DETECTION SYSTEM