目标红外辐射双色比值的大气传输研究

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。

Transmission of Two Wave Bands Infrared Radiation Ratio of Aerial Object in the Atmosphere

When the infrared radiation of aerial object transmits through the air, it can be absorbed or scattered by the air and the aerosol in it. So the infrared radiation energy is extinct. The quantity of extinction can be described by the extinction coefficient. Extinction coefficient differs with different wavelengths. Infrared detector can detect infrared radiation of different wave bands. By some signal processing method, the distance of object can be obtain. The energy of infrared radiation and the ratio of dual wave can be decided which contribute to identify the kind of object. The formulas of gaining distance and infrared radiation message were deduced. The figures were given, which describe the relationship between the two wave band ratio and distance of classic aerial objects.