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空中目标的红外辐射在大气中传输时 ,大气以及大气中的气溶胶会对红外辐射产生吸收和散射 ,从而造成红外辐射的衰减。大气对红外辐射的衰减程度可以用消光系数来描述 ,波长不同 ,消光系数也不同。红外系统测量到的目标红外辐射的双色比值也会随目标距离变化而变化。由测量到的目标在两个波段的红外辐射 ,通过一定的信号处理手段 ,可得出目标的距离、双波段红外辐射能量、红外双色比值等信息 ,以此对空中目标的识别和定位。推导了利用大气消光系数获取空中目标距离信息和红外辐射信息的公式 ,画出了典型空中目标双色比值的大气传输图。
Aerial target infrared radiation is transmitted in the atmosphere, the atmosphere and atmospheric aerosol will absorb and scatter infrared radiation, resulting in attenuation of infrared radiation. Atmospheric attenuation of infrared radiation can be used to describe the extinction coefficient, different wavelengths, extinction coefficient is also different. The two-color ratio of the target infrared radiation measured by the infrared system also varies with the target distance. By measuring the target in the two bands of infrared radiation, through certain signal processing means, the target distance, dual-band infrared radiation energy, infrared bichromal ratio and other information, in order to identify and locate the air target. The formula of obtaining the information of airborne target distance and the information of infrared radiation using atmospheric extinction coefficient is deduced, and the atmospheric transmission diagram of the typical air target two-color ratio is drawn.