Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1988-09-06
1989-08-22
Barefoot, Galen L.
Aeronautics and astronautics
Spacecraft
Attitude control
B64G 128
Patent
active
048588580
ABSTRACT:
A reacquisition process is used in the event that an earth orientation of the yaw axis Z of an earth satellite is lost, in that the angular velocity .omega. of a flywheel, the rotational axis of which is oriented in the direction of a pitch axis Y, falls below a predetermined value as a result of an insufficient energy supply. After restoration of the energy supply, the pitch attitude of the earth satellite and, accordingly, the earth orientation of the yaw axis Z, are to be restored. For this purpose, constantly alternating increases and decreases in speed are commanded for the flywheel in a determined manner in correlation with the zero passages of the pitch deviation, whereby the satellite is subjected to a constant reversal of its direction of rotation. This occurs until the angular momentum of the satellite falls below a predetermined value during a zero passage of the pitch deviation.
REFERENCES:
patent: 3591108 (1971-07-01), Perkel
patent: 3695554 (1972-10-01), Phillips
patent: 4084772 (1978-04-01), Muhlfelder
patent: 4193570 (1980-03-01), Hoffman et al.
patent: 4275861 (1981-06-01), Hubert
patent: 4424948 (1984-01-01), Muhlfelder et al.
patent: 4504032 (1985-03-01), Phillips et al.
Barefoot Galen L.
Messerschmitt-Bolkow-Blohm GmbH
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