Jamming effect analysis of point-source infrared decoy on infrared spin-scan seeker

For the first-generation missiles that are still widely applied on modern battlefields, the point-source infrared decoy is an economical and effective jamming alternative. To improve the survival probability of target, it is essential to analyze the jamming effect deeply. In this paper, based on the target acquisition principle of spin-scan seeker, the mathematical expression of error signal is derived. By constructing a complete missile guidance loop, the jamming effect of the point-source infrared decoy for the first-generation missile is analyzed with different jamming parameters, including radiation power and separation velocity. The simulation results indicate that a decoy with higher radiation power intensity than that of target will leads to successful jamming. Moreover, increasing the separation velocity can enlarge the miss distance. The jamming effect analysis will give some suggestions for the target to deploy the point-source infrared decoy for successful evasion.