Ph.D. Proposal Presentation by Michael J. Robertson
Friday, March 26, 2004

( Dr. William Singhose, Chair)

"Command Generation for Tethered Satellite Systems"

Abstract

Command generation is a process by which input commands are constructed or modified such that the system’s response adheres to a set of desired performance specifications. Previously, a variety of command generation techniques such as input shaping have been used to reduce residual vibration, limit transient deflection, conserve fuel or adhere to numerous other performance specifications or performance measures.

This thesis addresses key issues regarding the application of command generation techniques to tethered satellite systems. The two primary objectives of this research are as follows: 1) combine command generation and feedback control to reduce the retrieval time of tethered satellites, and 2) develop command generation techniques for spinning tether systems.

More specifically, the proposed research addresses four specific aspects of command generation for tethered satellites systems: 1) command generation for a 2-D model of earth-pointing tethered satellites without tether flexibility, 2) command generation for a 2-D model of earth-pointing tethered satellites with tether flexibility, 3) command generation for a 3-D model of earth-pointing tethered satellites without tether flexibility, and 4) command generation for a spinning tethered satellite system. The proposed research is anticipated to advance the state-of-the-art in the field of command generation for tethered satellite systems and will potentially yield improvements in a number of practical tether applications.