Online Magnetometer Calibration in Consideration of Geomagnetic Anomalies Using Kalman Filters in Nanosatellites and Microsatellites
Publication: Journal of Aerospace Engineering
Volume 29, Issue 6
Abstract
Magnetic sensors are reliable, lightweight, and low power consumption sensors that are utilized in almost all nanosatellites and microsatellites for a magnetic attitude control system using magnetic torquers (MTQs). In some nanosatellites and microsatellites, magnetic sensors are utilized for magnetic moment estimation to compensate for torques owing to magnetic dipole disturbances, which are the dominant disturbances in these small satellites. To estimate the magnetic moment accurately, the errors of the magnetic sensors caused by the magnetic anomaly and bias noise from electrical devices should be estimated and compensated precisely. Although several previous studies have focused on the estimation and compensation of the errors of the magnetic sensors, the magnetic anomaly of the geomagnetic field has not been considered, even though the anomaly introduces large estimation errors. This research proposes a method to estimate the time-variable errors arising from both magnetometer bias and the magnetic anomaly of the geomagnetic field using an extended Kalman filter (EKF) and unscented Kalman filter (UKF). Based on numerical simulation results, this study concludes that the effects of both magnetic sensor bias and magnetic anomalies can be compensated for by the proposed method.
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Acknowledgments
This research was supported by JSPS KAKENHI (grant number 24-10554) and by The Hattori Hokokai Foundation. The authors would like to thank the Nano-JASMINE team at the University of Tokyo and the National Observatory of Japan for their unmatched technical competence and assistance.
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© 2016 American Society of Civil Engineers.
History
Received: May 27, 2014
Accepted: Dec 8, 2015
Published online: Jun 13, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 13, 2016
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