摘要
通过对海平面上水蒸气、二氧化碳含量对应大气吸收透过率的数据进行拟合,得出在3～5μm和8～13μm大气窗口,水蒸气吸收透过率与可降水分,二氧化碳吸收透过率与海平面路程长度的关系。并依据相关文献进行高度和斜程修正。分析了大气对红外辐射的散射衰减以及总衰减。在此基础上基于MRTD法和约翰逊准则给出了扩展源目标红外辐射作用距离的估算方程。综合考虑了目标形状、大气能见度、海拔高度、目标天顶角和空间频率以及探测概率等多种因素对热成像系统作用距离的影响,给出了作用距离估算实例及结果。
By fitting the corresponding atmospheric transmittance data of the contents of water vapor and carbon dioxide, the relationships between water vapor absorption transmittance and precipitable water vapor, and between the carbon dioxide absorption transmittance and sea-level distance were presented respectively in atmospheric window 3-5 μm and 8-13 μm. According to the related references, the altitude and slant path were modified.The infrared scattering attenuation and total attenuation in atmosphere were analyzed. Based on MRTD and Johnson criteria, the expression of the operating range of infrared system for expanded target was presented. The factors of target size, atmospheric visibility, altitude, target＇s zenith angle, spatial frequency, and detection probability and so on were also had been considered.At last, the actual example and results were shown.
出处
《红外与激光工程》
EI
CSCD
北大核心
2008年第6期941-944,共4页
Infrared and Laser Engineering
关键词
红外系统
作用距离
大气衰减
MRTD
Infrared system
Operating range
Atmosphere attenuation
MRTD
