A Fuzzy Dual Closed-Loop Control Scheme for Precision Stabilized Platform

In this paper, a novel dual closed-loop control method based on fractional-order fuzzy sliding mode control and fractional-order active disturbance rejection control (FOFSMCFOADRC) is proposed for high-accuracy photoelectric tracking system subjected to inner uncertainties and external disturbances. First, in the inner loop, fractional-order fuzzy sliding mode control (FOFSMC) offers new flexibility and additional degrees of freedom, enabling the achievement of desired tracking performance. In addition, only a nominal model of the plant is required instead of a precise model in the practical control process. Second, in the outer loop, fractional-order active disturbance rejection control (FOADRC) is employed to decrease the adverse influence of disturbances on the platform. Furthermore, the stability of the proposed method is analyzed and guaranteed. Finally, a number of comparative simulations and real-world experimental validations are conducted to demonstrate the effectiveness and superiority of the proposed method in a comprehensive fashion.