Second-order fast terminal sliding mode control for missile systems with backstepping technique

In this paper, a second-order fast terminal sliding mode control (SFTSMC) scheme with backstepping is proposed to achieve the desired tracking performance for an uncertain missile's lateral system with external disturbance. This control strategy can be applied to generate lateral control commands on missile operating in flight regimes where the effectiveness of conventional aerodynamic surfaces is reduced (high angle of attack). The design procedure is divided into two steps. Firstly, we use backstepping technique to design a second-order fast terminal sliding surface (FTSS), and it drive tracking-error to converge to zero in finite time. Secondly, the SFTSMC scheme is designed by using Lyapunov's method, which can ensure the occurrence of the sliding motion in finite time. Furthermore, It can hold the character of fast transient response, improve the tracking accuracy and particularly effective to eliminate the chattering. Finally, the simulation results demonstrate the effectiveness of the proposed control scheme.