Magnetically torqued nutation damping

Details Magnetically torqued nutation damping Magnetically torqued nutation damping

1981-01-22

1984-01-10

Barefoot, Galen L.

Aeronautics and astronautics

Spacecraft

Attitude control

244170, B64G 132, B64G 138

Patent

active

044249489

ABSTRACT:
A system for actively damping nutation of a satellite and/or aligning the pitch axis of a momentum bias satellite with some external reference includes a magnetic torquing means which is energized with currents of appropriate polarity and magnitude to effect the necessary torque to reduce nutation. A roll sensor produces signals proportional to the roll error of the satellite. A control signal is generated a predetermined time period after the roll error exceeds a predetermined threshold. The predetermined time period is a fraction x of the nutation period t.sub.n of the satellite or x+n(t.sub.n) where n is an integer.

REFERENCES:
patent: 3558078 (1971-01-01), Lanzaro
patent: 3643897 (1972-02-01), Johnson
patent: 3834653 (1974-09-01), Perkel
patent: 3937423 (1976-02-01), Johansen
patent: 3944172 (1976-03-01), Becker
patent: 3977633 (1976-08-01), Keigler et al.
patent: 3984071 (1976-10-01), Fleming
patent: 3997137 (1976-12-01), Phillips
patent: 4062509 (1977-12-01), Muhlfelder
"Magnetic Attitude Control of a Momentum-Biased Satellite in Near-Equitorial Orbit", P. S. Goel et al., J. Guidance and Control, Jul.-Aug. 1979.

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