Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1974-08-29
1976-10-05
Blix, Trygve M.
Aeronautics and astronautics
Spacecraft
Attitude control
2351502, 244 322, B64G 100
Patent
active
039840719
ABSTRACT:
An active attitude control apparatus for damping roll/yaw nutation motion within the control deadband of a satellite which is three-axis stabilized to local vertical by means of a pitch biased, body-fixed reaction wheel and offset roll-yaw thrusters. The apparatus is incorporated into a system in which large attitude motion outside the deadband is controlled by means of the offset roll/yaw control thrusters with an accompanying control mechanism for activating the thrusters in an appropriate direction when motion outside the deadband is sensed. The present apparatus includes logic circuitry apparatus to cause a second thruster activation, of the same sense, after each deadband actuated thruster firing, where such a firing in the same sense has not been triggered within a certain elapsed portion of the satellite nutation period, approximately 5/8ths of the period being preferred.
REFERENCES:
patent: 3437288 (1969-04-01), Domaulam
patent: 3547381 (1970-12-01), Shaw et al.
patent: 3624367 (1971-11-01), Hamilton et al.
patent: 3643897 (1972-02-01), Johnson, Jr.
Anderson Daniel T.
Blix Trygve M.
Koundakjian Stephen J.
Kunin Stephen G.
Oser Edwin A.
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