地基光电系统白天在可见光波段对空间目标观测时,因受大气散射等因素的影响,探测能力会急剧下降。红外波段较可见光波段具有较强的大气穿透能力,因此在红外波段观测空间目标可以较好地解决白天探测的问题。利用MODTRAN模型计算了不同大气成分对中波红外透射率的影响并进行了分析,并用中波红外成像系统在地基望远镜上进行了观测。实验结果表明,中波红外探测器在白天能极限探测到7等星,平均信噪比为6.236。本研究对白天红外波段地基的空间探测具有一定参考意义。

When a ground-based opto-electronic system is used to observe the space targets in the visible light waveband in the daytime, its detection ability will drop sharply due to the factors such as atmospheric scattering. Compared with the visible light waveband, the infrared waveband has strong atmospheric penetration ability. Therefore, to observe space targets in the infrared waveband can solve the detection problem occurred in the daytime. The influence of different atmospheric composition on medium wave infrared transmission is calculated and analyzed by a MODTRAN software and a medium wave infrared imaging system is used in a ground-based telescope for observation. The experimental results show that the medium wave infrared detector can detect the stars of seventh magnitude in the daytime and the average signal-to-noise ratio is 6.236. This research is of a certain referential significance to the space detection by ground-based infrared telescopes in the daytime.