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Fast calculation method of complex space targets' optical cross section

机译：复杂空间目标光学截面的快速计算方法

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This paper utilizes the optical cross section (OCS) to characterize the optical scattering characteristics of a space target under the conditions of Sun lighting. We derive the mathematical expression of OCS according to the radiometric theory, and put forward a fast visualization calculation method of complex space targets' OCS based on an OpenGL and 3D model. Through the OCS simulation of Lambert bodies (cylinder and sphere), the computational accuracy and speed of the algorithm were verified. By using this method, the relative error for OCS will not exceed 0.1%, and it only takes 0.05 s to complete a complex calculation. Additionally, we calculated the OCS of three actual satellites with bidirectional reflectance distribution function model parameters in visible bands, and results indicate that it is easy to distinguish the three targets by comparing their OCS curves. This work is helpful for the identification and classification of unresolved space target based on photometric characteristics.
机译：本文利用光学截面（OCS）表征了在阳光照射条件下空间目标的光学散射特性。根据辐射理论推导了OCS的数学表达式，提出了基于OpenGL和3D模型的复杂空间目标OCS的快速可视化计算方法。通过Lambert体（圆柱体和球体）的OCS仿真，验证了算法的计算精度和速度。通过这种方法，OCS的相对误差将不会超过0.1％，仅需0.05 s即可完成复杂的计算。此外，我们使用可见波段中的双向反射率分布函数模型参数计算了三个实际卫星的OCS，结果表明，通过比较三个目标的OCS曲线很容易区分三个目标。这项工作有助于根据光度学特征对未解决的空间目标进行识别和分类。

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