Reaction wheel speed observer system

Details Reaction wheel speed observer system Reaction wheel speed observer system

1995-01-23

1996-12-10

Kashnikow, Andres

Aeronautics and astronautics

Spacecraft

Attitude control

244171, 244176, B64G 124, B64G 136

Patent

active

055823688

ABSTRACT:
A spacecraft (10) includes and attitude sensor (16) for generating sensed attitude signals. A controllable drive arrangement (238) is coupled to a reaction wheel (46), for driving it in response to speed error signals. The drive results in changes in reaction wheel speed. The spacecraft has a digital speed sensor (248) coupled to the reaction wheel, for generating quantized speed signals. A reaction wheel speed error signal generator (234) produces speed error signals in response to the difference between the attitude command and the sensed attitude signals, corrected by signals responsive to the speed of the reaction wheel, whereby at low reaction wheel speeds, the quantization causes attitude errors. A speed quantization correction arrangement (250) is coupled to the digital speed sensor (248) and to the reaction wheel speed error signal generator (234), for adding noise to the quantized speed signals, for thereby generating dithered wheel speed signals, and for filtering the dithered wheel speed signals with a low pass characteristic, for generating quantization corrected speed signals responsive to the speed of the reaction wheel. The filtered noise smooths the wheel speed quantization steps, thereby stabilizing the control loops.

REFERENCES:
patent: 3968352 (1976-07-01), Andeen
patent: 4537375 (1985-08-01), Chan
patent: 5021745 (1991-06-01), Stetson, Jr.
patent: 5201833 (1993-04-01), Goodzeit et al.

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