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The Use of a Gyroless Wheel-Tach Controller in SDO Safehold ModeThis paper describes the progression of the Safehold mode design on the Solar Dynamics Observatory satellite. Safehold uses coarse Sun sensors and reaction wheel tachometers to keep the spacecraft in a thermally safe and power-positive attitude. The control algorithm is described, and simulation results shown. Specific control issues arose when the spacecraft entered eclipse, and a description of the trade study which added gyroscopes to the mode is included. The paper concludes with the results from the linear and nonlinear stability analysis.
Document ID
20050242054
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Bourkland, Kristin L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Starin, Scott R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mangus, David J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Starin, Scott (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: 595 Flight Mechanics Symposium
Location: Greenbelt, MD
Country: United States
Start Date: October 18, 2005
End Date: October 20, 2005
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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