Three-Dimensional Anti-Disturbance Guidance for Impact Angle Control with Field-of-View Constraint

In this paper, a guidance law for missile applying dynamic surface technique is proposed in a three-dimensional (3D) space, considering constraints of impact angle and field-of-view (FOV), as well as disturbances. In order to meet the FOV constraint, the guidance model is converted by nonlinear mapping technique. A guidance law is designed applying the dynamic surface technique so that the line-of-sight (LOS) angles can track the desired ones, and finally the missile strikes the stationary target at the desired impact angle. By employing the sliding mode observers, the unknown disturbances during guidance are estimated precisely in finite time. It is proved that the closed-loop system, including the sliding mode observers, the guidance law and the missile-target relative kinematics, is stable such that the LOS angles converge to the desired ones, and the overall lead angle always remains within the FOV constraint. Simulation results show the effectiveness of the proposed guidance law.