Robust attitude control for spacecraft based on normal matrix and pattern search

In this paper, the problem of robust and precise attitude stabilization is investigated for flexible spacecraft, modeled as a rigid hub with some flexible appendages attached. The normal matrix control theory, one of the H _∞ control method, is applied to obtain the robust control based on the normality of spacecraft attitude dynamics and the multiplicative perturbation. The pattern search is employed to ensure the required precision for the online tuning of parameters of controller. The same proportion- differentiation control with structural filter for three attitude loops can be robust control for spacecraft. The proposed controller reduces the parameter space of the pattern search, therefore shortens the running time and saves the computing resource. The simulation results show the efficiency of the proposed control strategy.