针对空中目标在复杂背景下的探测需求, 根据实际目标的运动特性, 分析目标在飞行高度、飞行姿态角改变时的辐射特点, 基于MODTRAN计算得到大气辐射和衰减数据, 建立目标的三维模型 、热辐射和反射模型, 搭建空中目标的红外成像仿真系统.分析和仿真结果表明: 在中波波段, 目标尾焰的红外辐射比蒙皮强很多, 在长波波段, 蒙皮的红外辐射比较强, 仿真图像的细节比较多, 尾焰的红外辐射虽然有所减弱, 红外成像效果依旧很好; 相同探测条件下, 由于位置越高大气越稀薄, 探测器的可探测距离会变得比较远.目标红外辐射特性的分析和红外仿真系统的搭建对缩短红 外探测器的研制周期和进一步确定探测器波段和系统分辨率等指标提供了参考依据.

In order to meet the detection requirement of aerial target in the complex background, according to the motion characteristic of aerial target in actual situation, the radiation characteristics of the target in different flight altitude and detection elevation were analyzed, the atmospheric radiation and attenuation data were calculated based on MODTRAN, and the infrared imaging simulation system was established based on the 3D model, the thermal radiation and reflection model of aircraft. Results shows that in mid-wavelength, the infrared radiation of the target plume is much stronger than that of the skin. In the long-wave band, the infrared radiation of the skin is stronger, and the corresponding simulation image has more details, the infrared imaging is still good, although infrared radiation of the plume is weakened. Under the same detection conditions, the higher the location, the thinner the atmosphere, so the detectable distance of the detector will become longer. The infrared radiation characterization and simulation system building can provide a reference for shortening the development time of infrared detector and further determining the detection spectrum and system solution.