设计了一种空心发光椭球形紫外地球模拟器光学系统，其中，球体的一半被紫外光源照亮，另一半球不被照亮。通过控制紫外LED 灯组合成多个LED 组元和灯阵实现工作谱段范围内球表面发光亮度在0.2~l.2 W/(sr·m2)可调，发光表面亮度不均匀性优于20%，使用该系统模拟不同太阳亮度时“地相”的几何特征、辐射特性。介绍了地球模拟器的组成和工作原理，利用光学分析软件Lighttools 对地球模拟器的辐射亮度不均匀性进行了仿真分析，并利用有限元分析软件Ansys 对高轨紫外地球模拟器光机结构在0 ℃～45 ℃的变形进行具体分析。结果表明，球体表面亮度不均匀性为9.5%，辐亮度的最大平均值为1.42 W/(sr·m2)，且光机结构的温度变形量很微小，满足设计要求。

A hollow ellipsoidal earth simulator optical system emitting ultraviolet (UV) is designed, half of the sphere is illuminated by the UV light source, the other half is not illuminated. It′ s combined into a number of LED components and light array working to achieve the luminescence brightness of 0.2~1.2 W/(sr·m2) adjustable within the spectral range by controlling the UV LED lamps, and the inhomogeneity of surface emitting brightness is better than 20% ; so the geometric and radiation characteristics of the earth under different brightness conditions can be simulated. The composition and working principle of the earth simulator is introduced, the inhomogeneity of the earth simulator′s radiation brightness is analyzed using the optical analysis software called Lighttools, and the deformation of the opto- mechanical structure of the high orbit UV earth simulator at 0 ℃~45 ℃ is analyzed by the finite element analysis software called Ansys. The results show that the inhomogeneity of sphere surface brightness is 9.5%, the maximum average of the radiance is 1.42 W/(sr·m2), the deformation of the optical mechanism influenced by temperature is very tiny and the design requirements are fully satisfied.