Young Hwan Lho
International Journal of Aeronautical and Space Sicences, vol. 11, no. 3, pp.240-245, 2010

Abstract : The controller of a model reference adaptive control monitors the plant's inputs and outputs to acknowledge its characteristics. It then adapts itself to the characteristics it encounters instead of behaving in a fixed manner. An important part of every adaptive scheme is the adaptive law for estimating the unknown parameters on line. A more precise model is required to improve performance and to stabilize a given dynamic system, such as a satellite in which performance varies over time and the coefficients change due to disturbances, etc. After model identification, the robust controller (H_(∞ )) is designed to stabilize the rigid body and flexible body of a satellite, which can be perturbed due to disturbance. The result obtained by the H_(∞ ) controller is compared with that of the proportional and integration controller which is commonly used for stabilizing a satellite.

Keyword : Satellite attitude control, Adaptive control, Model identification, Proportional and integration controller, Robust controller (H_(∞ ))