This paper deals with the novel fractional order Linear Quadratic Gaussian (FLQG) controller and study of the robustness of this proposed controller in comparison with classical LQG. The significance of fractional order control is that it is a generalization and \\\\\\\"interpolation\\\\\\\" of the classical integer order control theory, which can achieve more adequate modeling and clear-cut design of robust control system. In this paper, LQR controller with fractional derivatives and Fractional Kalman filters are proposed. In addition fractional LQG is used to control the aircraft system. To demonstrate the enhancement in using fractional LQG, robustness of the control design is compared with the integer order LQG in the presence of coprime factor uncertainty. Simulations confirm much more robustness of the fractional order LQG than classical LQG.

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