基于天基红外预警系统的导弹主动段成像特征仿真

Simulation of Missile Active Section Imaging Feature Based on Space-Based Infrared Early Warning System

天基预警系统对导弹主动段探测成像时，受地表热辐射背景、中低层卷云背景、大气辐射衰减及高层卷云背景等因素影响，其中前两个因素可通过选择合适探测波段进行消除。因此，建立了弹道导弹尾焰-高层卷云背景-大气传输衰减-光学系统点扩散-探测器噪声效应信号级辐射传输模型，分析计算了从不同高度和观测角度大气传输对目标和背景的衰减；同时，利用OSG平台动态实时仿真了主动段成像。结果表明：当探测天顶角为50°和70°,目标信噪比较大，尾焰辐射强度较强，卷云辐射相对减弱，目标可被探测。

Missile active segment detection imaging based on space-based early warning system is affected by many factors such as, surface thermal radiation background, low-level cirrus background, atmospheric radiation attenuation, high-level cloud background, and the first two factors can be eliminated by selecting the appropriate detection band. Therefore, the missile tail flame - high-level cirrus background - atmospheric transmission attenuation - optical system point diffusion - noise effect of detector signal level radiation transmission model is established, analysis and calculation on the atmospheric transmission on the target and background attenua- tion from different heights and observation of angles are done. At the same time, active segment imaging is simulated real time using OSG platform. The results show that when the zenith angle is 50° and 70°, the signal - to - noise ratio of target is large, the intensity of tail flame is stron- ger, and the cirrus cloud radiation is relatively weak. Therefore, the target can be detected.