应用计算几何的月面太阳辐照度仿真模型

月面太阳辐照度对月面环境分析、月面巡视器设计具有重要意义。文章提出了一种应用计算几何的月面任意位置太阳辐照度仿真模型。首先,计算太阳、地球等天体相对月面点的位置;然后,将各天体投影至以月面点为球心的天球球面,并通过裁剪运算和二维布尔运算得到太阳未被遮挡的形状;最后,利用太阳可见面积对理想太阳辐照度模型进行修正,得到通用的模型。为验证提出模型的有效性,将仿真结果与STK软件进行比较。结果表明,文章中的模型综合考虑了地球、月面等多种因素对太阳辐射的耦合影响,其与STK软件获得的结果相比,更符合真实的太阳光照状态。

Lunar Surface Solar Irradiance Simulation Model Based on Computational Geometry

The study of solar irradiance on lunar surface is very important to lunar surface environment analysis and lunar rover design. A solar irradiance model for lunar surface＇s arbitrary position based on computational geometry is proposed. Firstly, the positions of the sun and the moon relative to a lunar surface point are computed. Secondly, the celestial bodies, including the sun, the earth and the moon, are projected in the celestial sphere centered at the lunar surface point. The shape of the sun that isn＇t occluded by the other celestial bodies is constructed with clipping and planar Boolean operations. Finally, the theoretical solar irradiance model is modified by the non-occluded shape area of the sun to get a general model. To illustrate efficiency and correctness of the model, the simulation results are compared with the STK＇s. The comparison indicates that the model of this paper considers coupling effect of the earth and lunar surface, and is closer to real sunlight condition than STK when the sun is shaded by several obstacles simultaneously.