A new three-dimensional fixed time sliding mode guidance with terminal angle constraints

In this paper, a continuous fixed-time guidance law with terminal angle constraints considering coupled dynamics is proposed for intercepting maneuvering targets in three-dimensional space. First, a fast fixed-time nonsingular sliding manifold is designed to guarantee the line-of-sight angle tracking errors and angular rates to zero in a fixed time. Next, a novel sliding mode reaching law is proposed to weaken the chattering phenomenon and guarantee guidance system states converge to sliding mode manifold in a fixed time. Finally, numerical simulations are conducted to validate the effectiveness and superiority of the proposed guidance law.