天空背景红外辐射亮度测量及其对目标探测的影响分析

摘要

天空背景的红外辐射特征对目标侦察探测具有重要意义。利用3μm～5μm中波、8μm～12μm长波红外测量设备对天空背景红外辐射亮度进行了测量，长波波段辐射亮度在3.7～13.6 Wm－2sr－1，中波波段辐射亮度在0.05～0.48 Wm－2sr－1，相同条件长波辐射亮度高于中波辐射亮度1～2个数量级；随着观测角增大，天空背景辐射亮度显著降低，同时太阳辐射、大气温度等因素也对天空背景辐射有较大的影响。利用测量结果仿真分析了天空背景辐射对目标侦察探测距离的影响，结果表明当观测角由9.6°降低到1.9°时，红外搜索跟踪系统探测距离会减少41.5%～46.2%。%The infrared radiation characteristics of sky background on the target detection has important significance. The sky background infrared radiation intensity was measured by using 3-5μm medium wave and 8-12 μm long wave infrared radiation measuring equipment, with 3.7-13.6 Wm-2sr-1 radiation brightness in long wave band and 0.05-0.48 Wm-2sr-1 radiation brightness in medium wave band. Under the same conditions, long wave radiation brightness is 1-2 magnitude higher than that of medium wave. With the observation angle increases, the brightness of the sky background radiation significantly reduced, and at the same time, solar radiation, air temperature and other factors also have a great effect on the sky background radiation. The measurement results of simulation and analysis of the sky background radiation of target reconnaissance detection range, the results show that when the view angle decreased from 9.6 degrees to 1.9 degrees, infrared search and track system’s detection range will reduce 41.5%-46.2%.