Minimization of spacecraft attitude error due to wheel speed...

Details Minimization of spacecraft attitude error due to wheel speed... Minimization of spacecraft attitude error due to wheel speed...

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G05D 1/08 (2006.01) B64G 1/28 (2006.01) B64G 1/32 (2006.01) B64G 1/34 (2006.01) B64G 1/36 (2006.01)

Patent

CA 1048128

MINIMIZATION OF SPACECRAFT ATTITUDE ERROR DUE TO WHEEL SPEED REVERSAL ABSTRACT OF THE DISCLOSURE An attitude control system for a substantially zero momentum spacecraft is arranged to minimize the attitude errors during periods of reaction wheel speed reversals. Wheel speed is sensed by a suitable device such as a tachometer or Hall elements. Spacecraft three axis attitude is sensed by suitable sensors such as sun sensors, star sensors, gyroscopes or earth horizon sensors. A control network is provided to generate the wheel torque commands necessary to maintain proper three axis attitude. During periods of wheel speed reversal, the control network includes appropriate compensation terms and corrections to the wheel torque command. -1-

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