Method for calibrating a magnetometer

The method and device for magnetometer calibration using a reference magnetic field source improve signal-to-noise ratio by calculating a ground-truth signal, addressing the cooling and interference challenges of SQUID sensors, and simplifying the calibration process.

WO2026104185A1PCT designated stage Publication Date: 2026-05-21ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2025-10-29
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing magnetometers, particularly SQUID sensors, require cooling below the superconducting transition temperature and are susceptible to magnetic interference fields, necessitating complex active filtering or shielding measures to improve signal-to-noise ratio.

Method used

A method and device for calibrating magnetometers using a magnetic field source positioned at a known distance and orientation, generating a reference magnetic field to calculate a ground-truth signal, allowing calibration based on the deviation between actual and ideal measurements, thereby eliminating the need for complex shielding or filtering.

Benefits of technology

Enables efficient calibration of magnetometers without complex shielding, improving the signal-to-noise ratio by generating a calibrated measurement signal through a transfer matrix, applicable to various types of magnetometers.

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Abstract

The invention relates to a method for calibrating a magnetometer using a magnetic field source arranged spaced apart from the magnetometer in a predetermined position, the method comprising the following steps: receiving a measurement signal from the magnetometer while the magnetic field source generates a predetermined reference magnetic field; calculating a ground-truth measurement signal, which is intended to correspond to a measurement signal of the magnetometer when solely measuring the reference magnetic field by the magnetometer, on the basis of the predetermined position and the predetermined reference magnetic field; calibrating the magnetometer on the basis of the measurement signal and the ground-truth measurement signal. The invention relates to a device, a system for calibrating a magnetometer, a computer program and a machine-readable storage medium.
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