Anti-jamming Trajectory Planning of Infrared Imaging Air-to-air Missile

When an infrared imaging air-to-air missile attacks a fighter target in head-on condition or tail attack condition, due to slow separation between the artificial infrared decoys and the fighter target in the field of view of the seeker, the probability of the missile anti-jamming will be greatly reduced. We say that the missile is in the low probability area of anti-jamming. If the target fighter releases artificial infrared decoys in the guidance sensitive period before the missile encounters the target, it may not only cause the seeker to lose the target prematurely and then the missile fails to hit the target, but also increase the miss distance because of the guidance signal interference by the decoys even when the seeker still keeps tracking the target till the end. In this paper, an anti-jamming trajectory planning is researched and proposed. First, judge whether the attack situation is in the anti-jamming low probability area. Second, if it is in low probability area, control the missile to implement appropriate trajectory maneuver to avoid head-on attack situation and tail attack situation. Third, choose an reasonable time to exit the anti-jamming trajectory and switch to the terminal guidance to ensure the guidance accuracy. Fourth, terminal guidance algorithm adopts the line of sight (LOS) angular acceleration compensation guidance (AACG), which can improve the guidance accuracy even when the guidance signal is interfered. Finally, numerical simulation of six degree of freedom guidance system is carried out. The simulation results verify the effect and feasibility of anti-jamming trajectory planning of infrared imaging air-to-air missile.