Observer-based integrated guidance and control under terminal impact angle constraint

摘要

Integrated guidance and control (IGC) design is an active research field in guided weapon system due to ability of utilizing measured information from both guidance loop and control loop. An observer-based composite control framework is proposed to accomplish the engagement of ground-fixed targets with a given impact angle. First of all, a relative motion dynamics in vertical plane of IGC is deducted. Next, an IGC framework is proposed by combining back-stepping method with sliding mode technique to accomplish the engagement while satisfying the terminal angle constraint. Furthermore, first-order low pass filter is utilized to prevent from “explosion of terms”. Lyapunov stability analysis demonstrates that the proposed IGC framework is stable. In addition, a nonlinear disturbance observer is applied to compensate external disturbance, which can improve the robustness of the introduced method. Finally, numerical simulation results prove its effectiveness and robustness.