【摘要】 针对在自然光环境下天地背景对空中目标的辐射作用,引入光学系统中的杂散辐射信息的计算,结合有限元算法采用并改进传统光线追迹计算模型求解目标散射信息。并且利用Kd-tree算法对面元结构目标建立空间分割描述结构实现加速计算,同时借助Modtran大气传输模型模拟计算自然环境下目标表面的入射光信息,从而利用BRDF模型计算获得复杂目标在天地背景中自然光辐射的散射信息。仿真计算结果表明,该方法相对于有限元求解算法具有相同的计算准确度,并且提升了6到10倍传统杂散辐射计算方法的计算速度。对目标杂散辐射的计算结果表明该方法对目标光学探测、识别和导弹制导等方面的研究具有很高的应用参考价值。更多还原

【Abstract】 Aiming at the radiation effect of sky and earth background on aerial targets in natural light environment,we introduced the stray radiation information computation in optical system,and calculated the target scattering information in combination with the finite element algorithm as well as using and improving traditional ray tracing calculation model. Moreover,we adopted the Kd-tree algorithm to establish the spatial segmentation description structure for bin structural targets to achieve the acceleration of calculation,at the same time,with the help of Modtran atmospheric transmission model we simulated the computation of the incident light information of target surface in natural environment,so that used the computation of BRDF model to obtain the scattering information of natural light radiation of complex targets in sky and earth background. Simulation computation results showed that the method in the paper had the same computational accuracy relative to finite element solution algorithm,and raised the calculation speed by six to ten times of that of traditional stray radiation calculation method. Result of the target stray radiation calculation showed that this method had very high applied reference value for researches in regard to target optical detection,recognition and missile guidance.更多还原