Discrete-Time Control of a Spacecraft With Retargetable Flexible Antennas
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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This dissertation considers the discrete-time control of a spacecraft consisting of a rigid platform with retargetable flexible antennas. The mission consists of independent minimum-time maneuvers of each antenna to coincide with predetermined lines of sight, while the platform is stabilized in an inertial space and elastic vibration of the antennas is suppressed. The system is governed by a set of linearized time-varying equations of motion. A discrete-time approach permits consideration of the time-varying nature of the system in designing the control law. Both global and decentralized controls are proposed for a noise-free system with full-state feedback. Initially, a time-varying linear-quadratic regulator LQR is implemented, followed by two types of decentralized controllers.
- Unmanned Spacecraft