适于制冷型红外侦测系统的作用距离修正模型

Modified model of operating range for cooled infrared detection system

提出了一种适于制冷型红外侦测系统的作用距离修正模型。分析了传统作用距离模型的局限性,考虑实用中冷阑、背景辐射和像差对制冷型红外侦测系统作用距离的影响,分别从探测率D*、信噪比SNR和像差参数τs三个方面对传统作用距离模型进行了修正,并针对导弹和飞机两种典型目标开展了红外侦测试验,结果表明:相比传统模型,修正后模型计算结果更符合实测情况,准确度明显提高。可为制冷型红外成像系统设计时的性能指标论证提供参考,也可用于指导红外系统实用时的优化布站。

A modified model of operating range for cooled infrared detection system is presented. The limitation of traditional operating range model is analyzed,and the existing model is modified from three aspects including detectivity,signal noise ratio and aberration after considering the influences of cold diaphragm,background radiation and aberrant on operating range of the cooled infrared detection system. The operating ranges for two typical targets（ missile and airplane） are calculated by using the modified model. The results show that compared with the traditional model,the modified model is more suitable for the actual situation and has a higher accuracy. This can provide a reference for the design and evaluation of cooled infrared detection system,and can also be used to direct the observation station arrangement for the infrared system.