Title page for ETD etd-063099-162244

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
  • Lyapunov Control Theory
  • Spacecraft Dynamics
  • Target Tracking
Date of Defense 1999-06-17
Availability unrestricted
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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