讨论了地面目标与背景红外辐射在大气中的传输情况,基于红外探测系统测出的目标与背景的辐照度差,提出了一种新的被动测距方法.利用该方法,得到了测距公式和测距的距离分辨率公式.计算了不同天气情况下,目标与背景的辐照度差与距离以及距离分辨率与距离之间的关系.计算结果表明,该方法可用于对地面目标的被动测距.

The infrared transmission of ground object and its background were discussed. A new passive distance measuring method was deduced based on the irradiance errors between the ground object and its background detected. By the above-mentioned new method, the formula of distance measuring and the formula of distance resolving power were formed. The relationship between the irradiance errors and the distance, and the relationship between the distances resolving power and the distance under different weather conditions were calculated. The calculation result has proved that the method can be applied to the distance measurement of ground objects.