Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1987-04-10
1989-02-28
Barefoot, Galen
Aeronautics and astronautics
Spacecraft
Attitude control
B64G 132
Patent
active
048078352
ABSTRACT:
The attitude of a spacecraft can be effectively controlled in three axes using the combination of a gravity gradient boom and three electromagnets. The electromagnets are controlled according to a control law that takes into consideration signals from a magnetometer and a signal indicating the orbital angular velocity of the spacecraft.
During the acquisition phase of the flight, the gravity gradient boom is not extended and electromagnets are operated according to a control law that only takes into account the output of the magnetometer. After the acquisition phase is complete, the gravity gradient boom is extended and the spacecraft enters the libration phase of the flight. In the libration phase of the flight, electromagnets are controlled according to a control law that takes into account both the output of the magnetometer and a signal which indicates the orbital angular velocity of the spacecraft.
REFERENCES:
patent: 3061239 (1962-10-01), Rusk
patent: 3232561 (1966-02-01), Adams
patent: 3367605 (1968-02-01), Wanger
patent: 3429524 (1969-02-01), Buckingham et al.
patent: 3489372 (1970-01-01), Ellis et al.
patent: 3681583 (1972-08-01), Kubo et al.
Barefoot Galen
Ithaco, Inc.
Stephens Richard G.
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