Forward tracking guidance law of non-singular fast dynamic surface sliding mode with dynamic characteristics

To solve the problem of forward tracking guided munition intercepting high-speed maneuvering targets and to ensure the guidance precision of forward tracking interception system, a novel forward tracking guidance algorithm based on the non-singular fast dynamic surface sliding mode is proposed in this study, which considers the influence of the dynamic characteristics for munition in the guidance system. Firstly, the influence of the manoeuvering ability for munition in the guidance system is considered, and then on the basis of the relative motion relation of the munition and the principle of forward tracking and interception, a forward tracking guidance system model with dynamic characteristics is established. Secondly, a nonlinear state observer is used to calculate the interference in the system. On this basis, a forward-tracking guidance law with dynamic characteristics is designed by using a non-singular fast dynamic surface sliding mode control method. Finally, the numerical simulation results show that compared with the traditional algorithm, the non-singular fast dynamic surface sliding mode forward tracking guidance law with dynamic characteristics can not only meet the design requirements but also has better guidance accuracy.