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IBM Journal of Research and Development  
Volume 20, Number 1, Page 58 (1976)
Space-related Technology
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Skylab Attitude Control System

by T. R. Coon, J. E. Irby
The attitude stabilization and control system for Skylab evolved from an analog controller into a fully digital processing system. Features of this system include a software-determined attitude reference to provide general maneuvering ability, an in-orbit programming capability, the use of large control moment gyros for attitude control, and the use of vehicle maneuvers to desaturate gyro momentum. The objectives, requirements, and implementations of the control system software are described, along with the rationales for certain design decisions and discussion of some system dynamics and actual performance.
Related Subjects: Control theory and systems; Space-related technology