Design of a fuzzy variable structure controller for controlling satellite attitude suffering from sensor data delay

Time delays in sensor data is one of the main issues in controlling the attitude of a satellite. Although, there exists methods to alleviate the problem, it is preferable to have a robust controller which can handle delays in sensor data well. In this study, a new method is proposed in the literature which uses an enhanced fuzzy variable structure controller that can handle delays in sensor data well. However it displays a steady state error. The novelty in this study is that the steady state error is handled using an integral term so that an acceptable performance is obtained.