影响红外目标探测亮度的因素

文中就红外目标探测实验中，目标辐射亮度随作用距离增加而增强的现象提出问题。以红外探测亮度方程为理论基础，利用大气辐射传输软件LOWTRAN，对目标与背景的红外辐射亮度、路径辐射亮度、路径透过率、距离和有效作用面积等影响红外目标探测亮度的各项因素进行了深入的分析。结果表明， 随着作用距离的增加， 背景辐射亮度增加在所有影响探测亮度的因素中占据主导地位，最终使得目标辐射亮度增加。通过文中的分析，合理解释了实验现象，对于设计红外探测系统、跟踪系统的目标提取算法具有十分重要的意义。

Factors of the detected luminance of an infrared target

In recent infrared warning experiments, an abnormal phenomena was discovered in which the target radiance increased with the active range. In this paper, how to solve the problem was discussed. Based on the theory of radiance detection equation and by the atmospheric radiance software LOWTRAN, a particular analysis was given about the factors affecting the infrared warning such as the infrared radiant characteristics of the target, the atmospheric irradiancy of the sky background, the irradiancy and the transmittance of the atmospheric path, the detection range, the effective area of the target facing the detector, and the principle. As a result, with the active range increased, the increment of the background radiance was dominant in all influenced factors, so the target radiance was larger and larger. Through the discussion, the abnormal phenomena were interpreted reasonably, and the conclusion was of great significance to develop the algorithm of target extraction for the infrared detective and tracking systems.