弹道导弹中段目标/背景红外图像建模与仿真

Modeling and Simulation of Target and Background Infrared ImageModeling Image in Middle Trajectory of Ballistic Missilein Missile

提出了一种针对弹道导弹中段目标和背景的动态红外辐射特性仿真方法。首先,建立了弹头目标/诱饵的三维模型,并结合其运动位置分析了影响弹头目标/诱饵红外辐射的因素,建立了较为完善的弹头目标/诱饵红外物理模型;其次,基于红外星表数据对恒星大气层外的辐照度进行了计算,根据红外传感器视轴指向和红外传感器视场,确定了红外传感器视场中的可见恒星,并根据拟生成背景图像的空间分辨率计算出这些恒星在背景图像中的相对位置分布,对星空背景直接进行了动态图像生成;然后,对成像过程中红外探测系统的噪声效应进行了建模与分析,同时给出了噪声的计算机模拟方法;最后,将生成的弹头目标/诱饵的红外图像与星空背景红外图像在灰度和空间2个层次上进行合成形成完整的弹头目标/诱饵/星空背景的红外仿真图像,可为弹道导弹中段红外电子对抗突防提供较为准确的数据支持。

The simulation method of dynamic infrared radiation characteristics of target and background in the middle tra- jectory of the ballistic missile was put forward in this paper. Firstly, the 3D models of the warhead and decoys were built. And the factors which influenced the infrared radiation of the warhead and decoys were analyzed combining with their loca- tion and the infrared physics models of warhead and decoys were established correspondingly. Secondly, the radiant inten- sity of extra-atmospheric star were computed based on infrared star catalogue data. The visible stars in the field of view （FOV） of the infrared sensor were confirmed according to the view axis and the FOV of the infrared sensor. The corre- sponding location distribution of these stars in the background images were calculated by the space distinguishable radio and the dynamic images of star-sky background are generated directly. Thirdly, the noise effect of infrared detection sys- tem in the imaging course was analyzed and simulated, and the computer simulation method was put forward accordingly. Finally, the whole warhead/decoys/star--sky background infrared image was synthesized by integrating the simulated infra- red image of warhead and decoy infrared image into the star-sky background in spatial stage and gray scale level. The sim- ulation results provided accurate data for the infrared confront and penetration in the middle trajectory of the ballistic mis- sile.