Magnetometer calibration method and device

Abstract

The invention discloses a magnetometer calibration method. The method comprises the steps of placing a magnetometer to be calibrated in a three-dimensional magnetic field with the magnetic field strength being constant, and respectively enabling each of the three axes of the magnetometer to be placed in a mode of being parallel to a magnetic induction line direction of the three-dimensional magnetic field; acquiring output values corresponding to at least four different placement directions of the magnetometer; and calculating a calibration parameter of the magnetometer according to the outputvalues corresponding to at least four different placement directions of the magnetometer and a magnetic field strength value of the three-dimensional magnetic field so as to complete calibration forthe magnetometer. The magnetometer calibration scheme disclosed by the invention is stable in calibration implementation experimental environment, comprehensive in calibration parameter and higher inaccuracy and calibration speed compared with a single-axis calibration scheme, can eliminate an instrument error of the magnetometer and achieves chip-level three-axis simultaneous calibration for themagnetometer.

Description

technical field [0001] The invention relates to the field of magnetometer calibration, in particular to a magnetometer calibration method and device. Background technique [0002] In the past, the magnetometer calibration was a plane calibration method or a figure-of-eight calibration method to eliminate the soft magnetic effect and hard magnetic effect in the environment, but the above calibration method is only an environmental calibration method. It needs to be recalibrated, and the accuracy of the calibration is based on the assumption that the output data of the magnetometer is accurate, so how to judge whether the output data of the magnetometer is accurate? Contents of the invention [0003] In view of the above problems, the present invention is proposed to provide a magnetometer calibration method and device that overcome the above problems or at least partially solve the above problems. [0004] According to one aspect of the present invention, a magnetometer ca...

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Problems solved by technology

[0002] In the past, the magnetometer calibration was a plane calibration method or a figure-of-eight calibration method to eliminate the soft magnetic effect and hard magnetic effect in the environment, but the above calibration method is only an environmental calibration method. It needs to be recalibrated, and the accuracy of the calibration is based on the assumption that the output data of the magnetometer is accurate, so how to judge whether the output data of the magnetometer is accurate?

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