人工红外光照射时目标与背景对比度的分析对目标的探测、识别、红外隐身技术的研究、红外特征的模拟有重要的意义。建立人工红外光照射地面目标的理论模型,从对比度的定义出发,推导出人工红外光照射时地面目标与背景对比度的一般计算式,对自然环境下人工红外光照射时目标与背景在全波段(0~+∞)、3~5µm波段以及8~14µm波段的对比度进行了仿真计算与分析。结果表明:采用不同功率光源照射目标和适当调整目标发射率能有效的降低目标与背景的对比度。

Analysis on contrast of ground targets and backgrounds irradiated through artificial infrared illuminator is a great signifi cation to detect, identify, study the IR stealth technology, simulate for infrared characteristic. The theory model which the ground targets are irradiated by artificial infrared illuminator is built, beginning with the definition, the basic calculation which the contrast of ground targets and backgrounds are irradiated through infrared illuminator is derived, the contrast of targets and backgrounds in the whole wave-band(0~+∞), 3~5µm wave-band, 8~14µm wave-band is simulation calculated and analysed when the ground targets in the natural environment. The results show that the contrast of targets and backgrounds will decline greatly when the targets are irradiated by different illuminator power and the tagets's emissivity are changed properly.