Abstract
Heading angle of magnetic compasses is estimated using the triaxial magnetometer readings. The accuracy of these readings is influenced by many factors such as sensor errors (scale factors, non-orthogonality, and offsets), and magnetic deviations (soft-iron and hard-iron interference). To calculate the true heading angle, the magnetic calibration of magnetometer is necessary. This research paper describes a calibration procedure for triaxial low-cost MEMS magnetometer. The proposed calibration method determines twelve calibration parameters in 3D arbitrary rotations of magnetometer.
Highlights
Advances in Micro-Electro-Mechanical System (MEMS) technologies have made a great role in wide range of engineering applications
The aim of this paper is to evaluate the calibration method which will account magnetometer sensor errors and magnetic interferences
The ideal compensation of hard-iron and soft-iron interference changes the 3D ellipsoid to a sphere centred in zero field and radius of local magnetic field strength
Summary
Advances in Micro-Electro-Mechanical System (MEMS) technologies have made a great role in wide range of engineering applications. Magnetometers have been used in geophysical research [1], military defence, mineral resources, drilling and mining practice [2]. These sensors measure the strength and direction of the local magnetic field. The main problem are errors such as zero deviation, scale factors, non-orthogonality, measurement noise, misalignment error, hard-iron and soft-iron interferences. The biggest effect comes from soft-iron and hard-iron interferences in the vicinity of the sensors. Calibration and compensation of such errors needs to be conducted
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