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Abstract
The main objective of this thesis is to study the issues of robustness of satellite control subsystem under typical and newly developed control algorithms. The typical control algorithms used in thesis are PD - Like controller, sliding mode controller and linear quadratic regulator. The thesis identifies and studies the sources of uncertainty in the model of the attitude control system. To assess robustness of the satellite model this work uses different robustness measurements such as kharitonov’s and argoun’s theorems as well as patel and toda’s and Yedavalli results. It is found that the simulation results of sensitivity study and robustness analysis correspond in the sense that variations, which lead to less sensitivity, also result in better robustness. It also shown that the classical control algorithms applied to systems with nonlinear perturbations display low robustness and deteriorated performance, which is highly affected by perturbations