Design of IMM estimation with differential game based guidance system in maneuvering target interception

A differential game based guidance law for passive ranging system (i.e. Image IR seeker) is presented in this paper. The interceptor system equipped with the IR seeker which can provide good stealth capability during its course of tracking the maneuvering invaders. With target motion uncertainty, the passive ranging system integrates the Extended Kalman Filter (EKF) with the Interacting Multiple Model (IMM) technique to minimize the errors in estimating the range and range rates incurred by the target´s maneuvering motion. The guidance law of the missile interceptor 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. Finally, extensive simulations incorporating aerodynamic model are demonstrated to verify the validity of the proposed system, and the simulation results reveal that the mission of intercepting a maneuvering target is accomplished successfully.