Adaptive Backstepping Sliding Mode Control for Roll Channel of Launch Vehicle

This paper presents a comparative study of Backstepping Control, Adaptive Backstepping Control and Adaptive Backstepping Sliding Mode Control on Roll channel of Launch vehicle. Backstepping Control design involves a systematic construction of both feedback control laws and associated Lyapunov functions. The Backstepping design methodology fails in the presence of parameter uncertainties. With Adaptive Backstepping, stabilization is achieved in the presence of unknown parameters. Robustness of Adaptive Backstepping Control can be increased by designing a sliding surface to the associated Lyapunov function. Thus Adaptive Backstepping Sliding Mode Control combines the advantages of both Adaptive Backstepping and Sliding Mode. The comparison of the proposed control schemes is verified by the MATLAB simulation. From the simulation results it is clear that Adaptive Backstepping Sliding Mode Control Scheme gives better and satisfactory responses.