Full state-constrained integrated guidance and control for aerial interceptors with tunnel prescribed performance using integral barrier Lyapunov function

A novel full state-constrained integrated guidance and control (IGC) schema for aerial interceptors under input saturation with tunnel-prescribed performance is proposed. To achieve an appointed-time engagement with less overshoot phenomenon, the tunnel-prescribed performance control (TPPC) technique is applied to generate virtual guidance laws, where the tracking of desired line of sight (LOS) angles possesses predefined-time convergent property. For the sake of the flight safety of interceptors in a practical flight environment, the physical limitations on the flight angles and the angular rates of attitude systems are taken into consideration. The integral barrier Lyapunov function (iBLF) technique is adopted to ensure all the attitude states within a user-defined domain. The nominal virtual commands are generated adaptively by the backstepping method combined with some novel dynamic surfaces. To further eliminate the possible input saturation, a novel one-order auxiliary system is constructed to compensate for the discrepancy of the virtual input commands. All the signals in the closed-loop system are strictly proven to be bounded by Lyapunov theory. The simulation results show the effectiveness of the proposed IGC schema by comparison with other IGC laws.