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An Investigation of Nonlinear Control of Spacecraft Attitude

The design of controllers subject to the nonlinear H-infinity criterion is explored. The plants to be controlled are the attitude motion of spacecraft, subject to some disturbance torque. Two cases are considered: the regulation about an inertially-fixed direction, and an Earth-pointing spacecraft in a circular orbit, subject to the gravity-gradient torque. The spacecraft attitude is described using the modified Rodrigues parameters. A series of controllers are designed using the nonlinear H-infinity control criterion, and are subsequently generated using a Taylor series expansion to approximate solutions of the relevant Hamilton-Jacobi equations. The controllers are compared, using both input-output and initial condition simulations. A proof is used to demonstrate that the linearized controller solves the H-infinity control problem for the inertial pointing problem when describing the plant using the modified Rodrigues parameters.

Identiferoai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/42688
Date21 November 2013
CreatorsBinette, Mark Richard
ContributorsDamaren, Christopher John, Pavel, Lacra
Source SetsUniversity of Toronto
Languageen_ca
Detected LanguageEnglish
TypeThesis

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