An Adaptive Terminal Sliding Mode Guidance Law for Head Pursuit Interception with Impact Angle Considered

Abstract

Head pursuit interception is useful in modern industries. Because it is difficult to intercept a high-speed target directly, the head pursuit is frequently used to intercept targets such as re-entry flight vehicle. This paper proposes an adaptive terminal sliding mode control method for intercepting a high-speed manoeuver target with impact angle considered. It introduces the mathematical model of relative motion between interceptor and target to design the sliding mode surface so as to meet the critical conditions of head pursuit interception. With the dynamic characteristics of both interceptor and target considered, it designs an adaptive terminal sliding mode guidance law to compensate for modelling errors and to improve the interception accuracy. It uses the Lyapunov method to analyse the theoretical stability. Finally it carried out numerical simulations to validate the robustness and effectiveness of the guidance law, thus obtaining good interception performances.