This paper investigates the anti-jamming issues during the terminal guidance phase of air-to-air infrared guided missile. The objective is to improve the accuracy of missile interception against target, which is achieved by identifying target based on the differences in motion characteristics between decoys and target, and by fusing information from the infrared seeker head and battlefield electromagnetic auxiliary observers. Through the design of trajectory feedforward and feedback methods, the combination of the Hungarian matching measurement correlation technique with information fusion state estimation technology enables the accomplishment of complex multi-target tracking under infrared countermeasures and allows stable infrared tracking trajectories to be established. Additionally, to achieve accurate target identification, a full-state matching method of infrared-electromagnetic estimation is established. The simulation results confirm the effectiveness of the algorithm.