Robust H infinity Controller Based on Fuzzy Observer Via LMI for Disturbance Rejection

In the synthesis of control systems, the stability is not only the main objective. But also robustness to the effect of the disturbance is required. In this paper, robust H_infin control design based on fuzzy observer by linear matrix inequality is carried out in order to achieve a disturbance rejection. In addition, using fuzzy observer, the unmeasured states such as angle of attack can be estimated. To test the effectiveness of this design approach, simulation results for stabilizing a launch vehicle are included.