Quantitative evaluation of laser jamming effect on imaging systems

摘要

The paper is devoted to a study of methods for quantitatively evaluating the jamming effect of a laser jamming device on electro-optical imaging systems. Based on the theory of digital image processing and the Johnson criterion for target detection and discrimination, four evaluation rules for laser jamming effect on electro-optical observation and aiming devices are proposed. For the target-discrimination-grade, target-discrimination-probability, or target-discriminationrange rule, the laser jamming effect is evaluated respectively according to the change of the target discrimination grade, probability, or range of the imaging system after being jammed. For the correlativity rule, the jamming effect is determined according to the correlativity between the two images of the imaging system before and after being jammed. In order to evaluate laser jamming effect on electro-optical search and track systems, three evaluation rules are proposed for the three working stages of the imaging system. At the searching or capturing stage, the jamming effect could be evaluated respectively according to the change of the target detection or capture probability of the imaging system after being jammed. At the tracking stage, whether the imaging system under jamming could produce effective tracking errors, or whether the tracking errors exceed three times its normal tracking accuracy is proposed as the criterion for determining whether the jamming is effective or not, and the jamming effect could be graded according to the jamming success rate for numbers of tests. Finally, the test methods for laser jamming effect on electro-optical imaging systems are discussed.