红外被动定位研究

空中目标的红外辐射在大气中传输中，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。如果大气气象条件在短时间内变化很小，则可认为消光系数在这段时间内没有变化。红外探测系统可以分时探测两个或多个波段的红外辐射，通过一定的信号处理手段，实现对空中目标的被动定位。文中推导了利用消光系数对空中目标进行定位的公式，并进行了计算。

Research on infrared passitive location

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 extincted. The quantity of extinction can be described by the extinction coefficient. Extinction coefficient differs according to different wavelengths. If the weather condition of the atmosphere changes a little in short time, we can consider that the extinction coefficient has no change. Infrared detector can detect infrared radiation of different wave bands and the location of the aerial object is determined by some signal processing method. In the paper, the formula which makes use of extinction coefficient to locate the aerial object is derived and some examples are also illustrated.