Partial States Feedback-Based Integrated Guidance and Control Design for Hypersonic Interceptor

For the integrated guidance and control (IGC) system of hypersonic interceptor with unmeasurable LOS angle rate and angle of attack, a novel controller based on partial states feedback is proposed. Firstly, the unmeasurable states and uncertainties are observered by a linear extended state observer (LESO). Then, a back-stepping controller is proposed for the IGC system. The proposed back-stepping controller not only use the estimated state to avoid using unmeasurable LOS angle rate and angle of attack, but also use the estimated uncertainties to enhance the robustness of IGC system. the closed loop system stability is proved by the Lyapunov theory. Simulation results demonstrate the the proposed method still can achieve enough small miss distance even if the LOS angle rate and angle of attack are unmeasurable.