Observability Analysis of In-flight Calibration of Gyros and Attitude Sensors on Orbit

Sejong Heo, Hyunjin Kim, Chan Gook Park

Abstract:	This paper deals with in-flight calibration method of gyros and attitude sensors of the spacecraft on orbit. On-orbit calibration is an in-flight calibration process for more precise spacecraft attitude determination. For the spacecraft which is required more precise pointing accuracy, on-orbit calibration should be performed after the launch to accommodate attitude estimation error caused by vibration and thermal shocks. In this paper, a Quaternion based Extended Kalman Filter (EKF) is used to perform the on-orbit calibration. The observability of - calibration along trajectories is discussed by Lie-derivative -based observability analysis, and the degree of observability is computed by singular value decomposition (SVD). It is shown that the system is globally observable with calibration maneuver and the analysis results about the observable degree of each state are presented.
Published in:	Proceedings of IEEE/ION PLANS 2016 April 11 - 14, 2016 Hyatt Regency Hotel Savannah, GA
Pages:	964 - 969
Cite this article:	Heo, Sejong, Kim, Hyunjin, Park, Chan Gook, "Observability Analysis of In-flight Calibration of Gyros and Attitude Sensors on Orbit," Proceedings of IEEE/ION PLANS 2016, Savannah, GA, April 2016, pp. 964-969. https://doi.org/10.1109/PLANS.2016.7479795
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