Aeronautics and astronautics – Spacecraft – Attitude control
Reexamination Certificate
2007-04-03
2007-04-03
Collins, Timothy D. (Department: 3643)
Aeronautics and astronautics
Spacecraft
Attitude control
C701S013000
Reexamination Certificate
active
10926092
ABSTRACT:
A spacecraft attitude control system and method in which an attitude controller is configured for sensing three-dimensional attitude of the spacecraft, and producing torque signals for stabilizing the spacecraft in a prescribed attitude in space. At least four mutually skew reaction wheels are rotated in response to the torque control signals for storing three-dimensional angular momentum, and speeds of rotation of the wheels are measured. A reaction wheel speed control processor, responsive to reaction wheel torque and speed for producing reaction wheel spin control signals, implements an infinity-norm algorithm for causing the nullspace components of wheel speed to re-distribute a desired three-dimensional stabilizing momentum of the spacecraft in such a manner that the maximum speeds of rotation of all the reaction wheels is minimized. As a result, periods between successive momentum dumping maneuvers are prolonged to the maximum possible.
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Introduction To Matrix Computations, by G.W. Stewart, Chapter 4, pp. 160-207, Academic Press, New York, 1973.
Li Xipu
Ratan Santosh
Collins Timothy D.
Lockheed Martin Corporation
McDermott Will & Emery LLP.
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