Terminal angle constrained integrated guidance and control for missile pitch channel in the presence of input saturation

In this paper, in order to attack a fixed target and solve actuator saturation, an integrated guidance and control (IGC) scheme based on LESO and dynamic surface control algorithm with constrained terminal impact angle for missile pitch channel is proposed. Firstly, based on Coriolis theorem, an IGC model for pitch channel is established which does not assume that the initial velocity of the missile coincides with the line-of-sight (LOS) approximately. Then, an auxiliary system including a Nussbaum function is introduced to settle actuator saturation. The dynamic surface control algorithm with LESO which is used to estimate the disturbances of the system is designed to track the states of the system. What's more, the stability of the closed-loop system is proved theoretically according to Lyapunov theorem. The simulation results show that the missile can hit the target in desired impact angle stably without input saturation, which reflects validity of the control scheme.