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Real-time calibration algorithm of magnetometer for spinning projectiles

Xiaoming Zhang (North University of China, Taiyuan, China)
Chen Lei (North University of China, Taiyuan, China)
Jun Liu (North University of China, Taiyuan, China)
Jie Li (North University of China, Taiyuan, China)
Jie Tan (North University of China, Taiyuan, China)
Chen Lu (North University of China, Taiyuan, China)
Zheng-Zheng Chao (North University of China, Taiyuan, China)
Yu-Zhang Wan (North University of China, Taiyuan, China)

Sensor Review

ISSN: 0260-2288

Article publication date: 4 October 2019

Issue publication date: 26 May 2020

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Abstract

Purpose

In spite of the vehicle, magnetic field interference can be reduced by some measures and techniques in ammunition design and manufacturing stage, the corruption of the vehicle magnetic field can still reach hundreds to thousands of nanoteslas. Besides, the magnetic field that the ferromagnetic materials generate in response to the strong magnetic field in the vicinity of the body. So, a real-time and accurate vehicle magnetic field calibration method is needed to improve the real-time measurement accuracy of the geomagnetic field for spinning projectiles.

Design/methodology/approach

Unlike the past two-step calibration method, the algorithm uses a linear model to calibrate the magnetic measurement error in real-time. In the method, the elliptical model of magnetometer measurement is established to convert the coefficients of hard and soft iron errors into the parameters of the elliptic equation. Then, the parameters are estimated by recursive least square estimator in real-time. Finally, the initial conditions for the estimator are established using prior knowledge method or static calibration method.

Findings

Studies show the proposed algorithm has remarkable estimation accuracy and robustness and it realizes calibration the magnetic measurement error in real-time. A turntable experiments indicate that the post-calibration residuals approximate the measurement noise of the magnetometer and the roll accuracy is better than 1°. The algorithm is restricted to biaxial magnetometers’ calibration in real-time as expressed in this paper. It, however, should be possible to broaden this method’s applicability to triaxial magnetometers' calibration in real-time.

Originality/value

Unlike the past two-step calibration method, the algorithm uses a linear model to calibrate the magnetic measurement error in real-time and the calculation is small. Besides, it does not take up storage space. The proposed algorithm has remarkable estimation accuracy and robustness and it realizes calibration the magnetic measurement error in real time. The algorithm is restricted to biaxial magnetometers’ calibration in real-time as expressed in this paper. It, however, should be possible to broaden this method’s applicability to triaxial magnetometers’ calibration in real-time.

Keywords

Acknowledgements

This paper forms part of a special section “Innovative Sensor Systems”, guest edited by Hubert B. Keller, Rolf Seifert and Sina Keller.

Citation

Zhang, X., Lei, C., Liu, J., Li, J., Tan, J., Lu, C., Chao, Z.-Z. and Wan, Y.-Z. (2020), "Real-time calibration algorithm of magnetometer for spinning projectiles", Sensor Review, Vol. 40 No. 2, pp. 227-236. https://doi.org/10.1108/SR-04-2018-0088

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited