Disturbance rejection fractional-order controller design for launch vehicle

A novel controller based on active disturbance rejection control and fractional-order control is proposed for the attitude control of launch vehicle. An extended state observer is designed to estimate the impact from parametric uncertainties and disturbances by taking full advantage of the information from the gyros and the attitude sensors. A fractional-order controller is proposed to realize the attitude control by compensating the disturbances. A variable parameter is brought to expand the tuning range and obtain higher control accuracy. A hybrid algorithm based on genetic algorithm and particle swarm optimization is proposed to tune the parameters of the controller. Simulation results show that the controller exhibits better dynamic performance, higher ability in disturbance rejection and stronger robustness against the disturbances.