| Type of Document |
Master's Thesis |
| Author |
Long, Matthew Robert
|
| Author's Email Address |
mlong@aoe.vt.edu |
| URN |
etd-063099-162244 |
| Title |
Spacecraft Attitude Tracking Control |
| Degree |
Master of Science |
| Department |
Aerospace and Ocean Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Hall, Christopher D. |
Committee Chair |
| Anderson, Mark R. |
Committee Member |
| Lutze, Frederick H. Jr. |
Committee Member |
|
| Keywords |
- Lyapunov Control Theory
- Spacecraft Dynamics
- Target Tracking
|
| Date of Defense |
1999-06-17 |
| Availability |
unrestricted |
Abstract
The problem of reorienting a spacecraft to acquire a moving target is investigated. The spacecraft is modeled as a rigid body with N axisymmetric wheels controlled by axial torques, and the kinematics are represented by Modified Rodriques Parameters. The trajectory, denoted the reference trajectory, is one generated by a virtual spacecraft that is identical to the actual spacecraft. The open-loop reference attitude, angular velocity, and angular acceleration tracking commands are constructed so that the solar panel vector is perpendicular to the sun vector during the tracking maneuver. We develop a nonlinear feedback tracking control law, derived from Lyapunov stability and control theory, to provide the control torques for target tracking. The controller makes the body frame asymptotically track the reference motion when there are initial errors in the attitude and angular velocity. A spacecraft model, based on the X-ray Timing Explorer spacecraft, is used to demonstrate the effectiveness of the Lyapunov controller in tracking a given target.
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| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
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| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
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thesis.pdf |
788.54 Kb |
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