Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1995-04-28
1997-09-16
Kashnikow, Andres
Aeronautics and astronautics
Spacecraft
Attitude control
244164, B64G 128
Patent
active
056671717
ABSTRACT:
Methods and systems for stabilizing satellite spin about an intermediate inertia axis (Z) are disclosed. A set of gyros (22) sense the X component and the Y component of the angular velocity of the satellite body. A single degree of freedom momentum wheel (26) has a fixed transverse orientation with respect to the intermediate axis in order to store momentum. In one embodiment, the momentum wheel (26) is oriented to store momentum parallel to the Y axis. A tachometer (30) senses the rotation rate of the momentum wheel (26). A processor (24) forms a control signal representative of a control torque to be applied to the momentum wheel (26). The control torque is based upon the X component and the Y component of angular velocity of the satellite, and the angular velocity of the momentum wheel (26). These methods and systems may also be used to invert the spin direction of spinning satellites, ensure tumble recover to a preferred orientation, and stabilize the body spin axis against nutation, dynamic imbalance and external torques.
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Fowell Richard A.
Yocum John F.
Denson-Low Wanda K.
Dinh Tien
Gudmestad Terje
Hughes Aircraft Company
Kashnikow Andres
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