Roll/yaw body steering for momentum biased spacecraft

Details Roll/yaw body steering for momentum biased spacecraft Roll/yaw body steering for momentum biased spacecraft

1976-01-28

1978-04-18

Kunin, Stephen G.

Aeronautics and astronautics

Spacecraft

Attitude control

244166, 244169, B64G 110

Patent

active

040847721

ABSTRACT:
Roll and yaw attitude errors introduced by orbit inclination deviations from the nominal orbit plane are minimized by sinusoidally varying the momentum produced by a transverse wheel mounted on the spacecraft. The wheel is mounted on the spacecraft such that its axis is parallel to the spacecraft's yaw axis. Sinusoidal variation of wheel momentum is obtained by sinusoidally varying wheel speed in response to a sine wave signal periodically updated from an earth station. In response to the sinusoidal variation of transverse wheel momentum, the spacecraft is rolled to minimize thereby the roll error introduced by the orbit deviation from the nominal orbit plane. Yaw error is minimized by providing sufficient transverse wheel momentum so as to maintain the total spacecraft momentum vector perpendicular to the nominal orbit plane.

REFERENCES:
patent: 2973162 (1961-02-01), Haeussermann
patent: 3429524 (1969-02-01), Buckingham et al.
patent: 3591108 (1971-07-01), Perkel et al.
patent: 3940096 (1976-02-01), Keigler et al.

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