红外光照射对目标与背景对比度影响研究

Target and its background contrast under infrared illumination

鉴于红外光对目标与背景对比度的影响对目标探测、识别、跟踪、红外隐身技术的研究和红外特征的模拟具有重要的意义,建立了自然环境下人工红外光照射地面目标的理论模型。从对比度定义出发,推导出了人工光照时地面目标与背景对比度的一般计算式,并对人工光照时目标与背景对比度的影响因素进行了数值计算与分析,结果表明:在相同条件下,照射距离越近、光照功率越大、光照时间越长,光源对目标与背景对比度的影响越大,对不同距离的光源,随着入射角的变化,投影在目标上的光源对目标与背景对比度的影响大。

The contrast between a ground target and its background under infrared illumination is very important for target detection,identification and tracking,as well as IR stealth and simulation of infrared signature.The theory model for a ground target irradiated by an artificial infrared illuminator is established.According to the definition of contrast,the basic calculation for the contrast between a ground target and its background under infrared illumination is derived;the factors affecting the contrast between the target and its background are calculated and analyzed.The results show that the greater effect on the contrast is observed when the target and its background are illuminate at a shorter distance with greater power and longer time.For illuminators at different distances,with the change of incident angle,the effect of the illuminator on the contrast becomes greater.