The guidance and control on a missile interceptor orchestrate the vehicle's functional subsystems to minimize miss distance. In contrast to the traditional cascaded G&C loop structure that treats the guidance and control as distinct subsystems, Integrated Guidance and Control (IGC) synthesizes these into a single entity. Now, a single-loop and single control law govern the fin actuation. The high relative degree of a missile engagement scenario makes controller design more difficult. The objective of this work is to develop a robust, smooth, high-order sliding mode controller to be used within the IDC framework that intercepts maneuvering targets using minimal information and an intuitive sliding mode surface. Nonlinear pitch plane engagement kinematics and linear pitch plane missile dynamics are defined for controller development and simulation purposes. Through simulation the control law is shown to be simple and intuitive, only requiring relative normal velocity for state feedback, meaning it can work in a GPS-denied environment.
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