Real-Time 3D Magnetometer Calibration for Embedded Systems Based on Ellipsoid Fitting

Magnetometers are massively diffused in a variety of instruments for different applications. However, these sensors are affected by non-idealities, especially bias and hard/soft-iron interference. Even though a number of calibration approaches could be adopted to compensate for magnetic interference...

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Bibliographic Details
Published in2018 12th International Conference on Sensing Technology (ICST) pp. 424 - 429
Main Authors Tedesco, Salvatore, Torres-Sanchez, Javier, OrFlynn, Brendan
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2018
Subjects
3D Magnetometer
Eigenvalues and eigenfunctions
Ellipsoid Fitting
Ellipsoids
Fitting
Magnetometers
Matrix decomposition
On-the-Fly Calibration
Real-Time Embedded Systems
Sensors
Symmetric matrices
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Summary:Magnetometers are massively diffused in a variety of instruments for different applications. However, these sensors are affected by non-idealities, especially bias and hard/soft-iron interference. Even though a number of calibration approaches could be adopted to compensate for magnetic interferences, their implementation on resources-constrained platforms is still problematic due to the highly complex, computationally intensive mathematical operations involved. The present work demonstrates the possibility to develop a fast and efficient 3D magnetometer calibration for real-time embedded systems with limited system resources. A number of techniques and approaches are discussed to mitigate the computational burden. Results confirm that this is achievable by preserving the same level of accuracy reached with more computationally intensive approaches. Results are also promising regarding the adoption of the discussed method on low-power real-life systems in several applications.
ISSN:2156-8073
DOI:10.1109/ICSensT.2018.8603667