Aeronautics and astronautics – Spacecraft – With special crew accommodations
Patent
1983-04-21
1985-08-27
Barefoot, Galen L.
Aeronautics and astronautics
Spacecraft
With special crew accommodations
244164, 244169, B64G 126
Patent
active
045373752
ABSTRACT:
Transients and steady state error induced in maneuvering a satellite due to a disturbance torque caused by thrust mismatch or differential in the alignment of thrusters with respect to the center of mass are minimized by introducing a torque balancing bias at the input of a thrust modulator of the thrusters prior to sensing position or attitude error. The bias may instantly off-modulate the thruster control signal to cancel the effects of attitude transients before errors develop. Other axes thrusters may be on-modulated instantaneously to compensate for cross-axis torque. The bias may be introduced into the satellite control scheme by manual ground control or in automatic on-board compensation based on stored parameters obtained for example from calibration measurements. Specifically, the torque balancing bias may be developed by reference to thrust mismatch detected and stored during previous maneuvers, thus anticipating expected attitude error without actual detection thereof.
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P. Brunet, "Compatibilite De La Stablisation H. Sat Avec Une Mission TV Directe", 12/25/78, Document No. 272/882.
Allen Kenneth R.
Barefoot Galen L.
Corl Rodney
Ford Aerospace & Communications Corporation
Radlo Edward J.
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