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Real-Time Attitude Independent Three Axis Magnetometer CalibrationIn this paper new real-time approaches for three-axis magnetometer sensor calibration are derived. These approaches rely on a conversion of the magnetometer-body and geomagnetic-reference vectors into an attitude independent observation by using scalar checking. The goal of the full calibration problem involves the determination of the magnetometer bias vector, scale factors and non-orthogonality corrections. Although the actual solution to this full calibration problem involves the minimization of a quartic loss function, the problem can be converted into a quadratic loss function by a centering approximation. This leads to a simple batch linear least squares solution. In this paper we develop alternative real-time algorithms based on both the extended Kalman filter and Unscented filter. With these real-time algorithms, a full magnetometer calibration can now be performed on-orbit during typical spacecraft mission-mode operations. Simulation results indicate that both algorithms provide accurate integer resolution in real time, but the Unscented filter is more robust to large initial condition errors than the extended Kalman filter. The algorithms are also tested using actual data from the Transition Region and Coronal Explorer (TRACE).
Document ID
20040031762
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Crassidis, John L.
(Buffalo Univ. NY, United States)
Lai, Kok-Lam
(Buffalo Univ. NY, United States)
Harman, Richard R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2003
Subject Category
Spacecraft Instrumentation And Astrionics
Meeting Information
Meeting: Flight Mechanics Symposium
Location: Greenbelt, MD
Country: United States
Start Date: October 28, 2003
End Date: October 30, 2003
Funding Number(s)
CONTRACT_GRANT: NAG5-12179
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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