B - Operations – Transporting – 64 – G
Patent
B - Operations, Transporting
64
G
244/1.2
B64G 1/26 (2006.01) G05D 1/08 (2006.01)
Patent
CA 1219848
METHOD AND APPARATUS FOR THRUSTER TRANSIENT CONTROL ABSTRACT OF THE DISCLOSURE 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 torgue 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.
444133
Ford Aerospace & Communications Corporation
Gowling Lafleur Henderson Llp
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