Fractional order sliding mode guidance law: Improving performance and robustness

In this paper, a new guidance law considering control loop dynamics is developed in order to intercept highly maneuvering targets. Since the great advantage of using fractional-order calculation at integer order control is to improve robustness and performance properties, a fractional terminal sliding mode guidance law is designed based on Lyapunov stability theory. As the autopilot dynamic has a significant contribution to guidance loop stability, it has been considered as a first order transfer function. Finally, the proposed guidance law is compared with the finite time proportional guidance law and the effectiveness and robustness of the proposed law against target maneuvers is demonstrated by means of simulation.