G - Physics – 05 – D
Patent
G - Physics
05
D
G05D 1/08 (2006.01) B64G 1/24 (2006.01) B64G 1/36 (2006.01)
Patent
CA 2117093
This device is used for controlling the attitude of a spacecraft to be rotated about a body axis of rotation. Actuators 38 generate torques about the axis of rotation and two lateral axes. Angular velocity signals .omega.x, .omega.y with respect to the lateral axes are in each case fed to first and second signal paths 19, 20 and 21, 22. The latter contain an integrator 25. Modulators 36 and 37, which each comprise a variable dead zone, supply control signals for the actuators 38. In order to limit the nutation amplitude in a reliable manner to a constant value, multiplication elements 23, 24 and 26, 27 are provided in the first and second signal paths, in which multiplication elements the lateral-axis angular velocity signals .omega.x, .omega.y or the angular position signals .PHI., .theta. are acted upon by factors which are proportional to the rotation axis angular velocity signal .omega.z or its square. Furthermore, the thresholds of the dead zones of the modulators 36, 37 are varied proportionally to .omega.~. A corresponding process for the attitude control is also indicated.
Bittner Helmut
Surauer Michael
Deutsche Aerospace Ag
Smart & Biggar
LandOfFree
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