Fuzzy adaptive observer‐based fault estimation design with adjustable parameter for satellite under unknown actuator faults and perturbations

This study considers the problem of fault estimation for rigid satellite in presence external disturbances, parameter perturbations, and actuator time-varying faults. Firstly, a Takagi-Sugeno (T-S) fuzzy model with interval matrix attitude system under large angle scope is established, along detailed analysis faults terms additive multiplicative descriptions. Then, novel adaptive observer adjustable proposed to estimate both states The estimated errors are proved be uniformly ultimately bounded, based on descriptor augmentation technique Lyapunov stability theory. realizes lower performance index quantitative assessment compared existing methods. Furthermore, an auxiliary optimization variable elimination method applied decrease conservatism design. And intuitive introduced obtain reliable evaluation decision. Finally, numerical simulations analyses illustrate effectiveness benefit strategy.