Abstract:A composite seeker tracing a microwave target may accidentally turn into infrared guidance state when affected by jam. A microwave/infrared target information fusion anti-jamming method is designed to improve the compositive seeker's anti-jamming performance. The correlativity between microwave signal and infrared signal are measured, the trends of both signal are analyzed real-time online to determine if the jam may interfere the handover decision. The result of MATLAB simulation shows that this method could give judgement for the handover result correctly, the stability of target tracing could be ensured in jamming environment.