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Attitude Control System Design for the Solar Dynamics ObservatoryThe Solar Dynamics Observatory mission, part of the Living With a Star program, will place a geosynchronous satellite in orbit to observe the Sun and relay data to a dedicated ground station at all times. SDO remains Sun- pointing throughout most of its mission for the instruments to take measurements of the Sun. The SDO attitude control system is a single-fault tolerant design. Its fully redundant attitude sensor complement includes 16 coarse Sun sensors, a digital Sun sensor, 3 two-axis inertial reference units, 2 star trackers, and 4 guide telescopes. Attitude actuation is performed using 4 reaction wheels and 8 thrusters, and a single main engine nominally provides velocity-change thrust. The attitude control software has five nominal control modes-3 wheel-based modes and 2 thruster-based modes. A wheel-based Safehold running in the attitude control electronics box improves the robustness of the system as a whole. All six modes are designed on the same basic proportional-integral-derivative attitude error structure, with more robust modes setting their integral gains to zero. The paper details the mode designs and their uses.
Document ID
20050243617
Document Type
Conference Paper
Authors
Starin, Scott R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bourkland, Kristin L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kuo-Chia, Liu (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mason, Paul A. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Vess, Melissa F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Andrews, Stephen F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Morgenstern, Wendy M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Solar Physics
Meeting Information
595 Flight Mechanics Svmposium(Greenbelt, MD)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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