| Type of Document |
Dissertation |
| Author |
Schwartz, Jana Lyn
|
| URN |
etd-07122004-165209 |
| Title |
The Distributed Spacecraft Attitude Control System Simulator: From Design Concept to Decentralized Control |
| Degree |
PhD |
| Department |
Aerospace and Ocean Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Hall, Christopher D. |
Committee Chair |
| Kasarda, Mary E. F. |
Committee Member |
| Schaub, Hanspeter |
Committee Member |
| Stilwell, Daniel J. |
Committee Member |
| Woolsey, Craig A. |
Committee Member |
|
| Keywords |
- Parameter Estimation
- Air Bearing Table
- Spacecraft Simulator
- Attitude Estimation
- Formation Flying
|
| Date of Defense |
2004-07-07 |
| Availability |
unrestricted |
Abstract
A spacecraft formation possesses several benefits over a single-satellite mission. However,
launching a fleet of satellites is a high-cost, high-risk venture. One way to mitigate
much of this risk is to demonstrate hardware and algorithm performance in groundbased
testbeds. It is typically difficult to experimentally replicate satellite dynamics
in an Earth-bound laboratory because of the influences of gravity and friction. An air
bearing provides a very low-torque environment for experimentation, thereby recapturing
the freedom of the space environment as effectively as possible. Depending upon con-
figuration, air-bearing systems provide some combination of translational and rotational
freedom; the three degrees of rotational freedom provided by a spherical air bearing are
ideal for investigation of spacecraft attitude dynamics and control problems.
An interest in experimental demonstration of formation flying led directly to the development
of the Distributed Spacecraft Attitude Control System Simulator (DSACSS). The
DSACSS is a unique facility, as it uses two air-bearing platforms working in concert. Thus
DSACSS provides a pair of "spacecraft" three degrees of attitude freedom each. Through
use of the DSACSS we are able to replicate the relative attitude dynamics between nodes
of a formation such as might be required for co-observation of a terrestrial target.
Many dissertations present a new mathematical technique or prove a new theory. This
dissertation presents the design and development of a new experimental system. Although
the DSACSS is not yet fully operational, a great deal of work has gone into
its development thus far. This work has ranged from configuration design to nonlinear
analysis to structural and electrical manufacturing. In this dissertation we focus on the
development of the attitude determination subsystem. This work includes development
of the equations of motion and analysis of the sensor suite dynamics. We develop nonlinear
filtering techniques for data fusion and attitude estimation, and extend this problem
to include estimation of the mass properties of the system. We include recommendations
for system modifications and improvements.
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
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56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
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| |
schwartzetd.pdf |
6.83 Mb |
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