Aeronautics and astronautics – Spacecraft – Attitude control
Reexamination Certificate
2005-08-03
2008-12-16
Collins, Timothy D (Department: 3643)
Aeronautics and astronautics
Spacecraft
Attitude control
C701S013000
Reexamination Certificate
active
07464899
ABSTRACT:
A method for avoiding singularities in the movement of CMGs in an array of CMGs in a spacecraft includes a first step where a maneuver command to rotate a spacecraft orientation is received. Then, the torque needed to rotate the spacecraft's orientation is determined. Then, the torque is integrated to determine a momentum path. The momentum path is decomposed into a sequence of straight line segments. For each line segment, a unit vector along the straight line segments is determined. Then, it is determined if there is a continuous path connecting a start point and an end point of the line segment in a plane perpendicular to the unit vector. For each point along the path in the plane perpendicular to the unit vector, a set of gimbal angles is determined.
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Elgersma Michael R.
Gayme Dennice F.
Johnson Daniel P.
Morton Blaise G.
Peck Mason A.
Collins Timothy D
Honeywell International , Inc.
Ingrassia Fisher & Lorenz P.C.
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