The integrated game theory based guidance law with nonlinear autopilot (GGNA) system is presented in this paper. The guidance law is designed based on linear differential game theory while considering the motion of the target in 3-D space such that the distance between the missile and the target is minimized faster than before. The autopilot system based on quaternion representation is developed using sliding mode control method to generate the attitude command. The stability of the integrated guidance and nonlinear autopilot system is analyzed with Lyapunov stability theory. In addition, this research assumes wingless missiles in our context in order to reduce the nonlinear effect from the aerodynamics. Furthermore, in order to extend the operation range of missiles from endo-atmosphere to exo-atmosphere, the missiles are equipped with Thrust Vector Control (TVC) mechanisms and Divert Control System (DCS). Finally, extensive simulations incorporating aerodynamic models are demonstrated to verify the validity of the proposed integrated guidance/autopilot systems. Moreover, the simulation results reveal that the mission of intercepting a maneuvering target is successfully accomplished.

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A guidance law of the missile interceptor with passive ranging system (e.g. image IR seeker) based on second-order sliding mode is proposed in this paper. The missile system equipped with the passive ranging system can provide good stealth ability during its course of tracking the trajectory of a maneuvering target, therefore enhancing the probability of successful interception. The passive ranging system integrates the Extended Kalman Filter (EKF) with the Interacting Multiple Model (IMM) technique to minimize the errors of estimating the range and range rates incurred by the target's maneuvers. By admitting the estimation error of the missile seeker, the guidance law is designed, applying Smooth Second-Order Sliding Mode (SSOSM) control technique so as to cope with the chattering and to hold against the maneuvering target. Finally, various simulation results are given to verify the proposed system performance.

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