This study proposes an adaptive fuzzy controller for attitude control system (ACS)\nof Innovative Satellite (InnoSAT) based on direct action type structure. In order to study new\nmethods used in satellite attitude control, this paper presents three structures of controllers:\nFuzzy PI, Fuzzy PD and conventional Fuzzy PID. The objective of this work is to compare the\ntime response and tracking performance among the three different structures of controllers. The\nparameters of controller were tuned on-line by adjustment mechanism, which was an approach\nsimilar to a PID error that could minimize errors between actual and model reference output.\nThis paper also presents a Model References Adaptive Control (MRAC) as a control scheme to\ncontrol time varying systems where the performance specifications were given in terms of the\nreference model. All the controllers were tested using InnoSAT system under some operating\nconditions such as disturbance, varying gain, measurement noise and time delay. In conclusion,\namong all considered DA-type structures, AFPID controller was observed as the best structure\nsince it outperformed other controllers in most conditions.
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