Abstract: To master the combat scenarios of theelectro-optical threat at fighter terminal, evaluate the use style strategies and performance of passive jamming methods, the comprehensive evaluation methods of set pair analysis and rough set theory was adopted to study the threat levels and threat sequencing implementation algorithms when different types and numbers of incoming missiles were attacked. Meanwhile, the modeling and calculation of the interference characteristics of aircraft, multi-point source decoys, escort free-flight decoys and surface-type infrared decoy were analyzed and researched; an infrared countermeasure scene was generated in which the aircraft and multi-point source decoys, escort free-flight decoys and surface-type infrared decoy interact with each other. The threat level evaluated by the alarm levelmodel was used to adaptively decide the use strategy of passive jamming, and could evaluate the interference effectiveness of theelectro-optical means of the fighter terminal. The results show that it can generate real-time infrared countermeasure scene of fighter terminal at different frame rates; according to the decision-making ability of threat ranking, the use strategy and jamming effectiveness of multi-point source, companion and non-point source decoys are effectively evaluated.

Key words: alarm level evaluation, infrared radiation, reverse Monte Carlo method, infrared scene modeling, effectiveness evaluation