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空间目标褶皱材质BRDF建模方法

Bidirectional Reflectance Distribution Function Modeling Approach of Space Objects’ Fold Material

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摘要

为了在太空中维持内部器件正常运转,卫星需要克服太空中近400 ℃的温差[1-2],常用的方法就是在卫星表面包覆多层隔热材料[3-4],如金色或银色聚酰亚胺等强镜反材质薄膜。但是由于受到制造工艺以及长期外部环境的影响,卫星表面常常会形成不规则的褶皱状,会对卫星自身的光学散射特性产生影响。而大多数空间目标光学特性仿真研究只将其表面视为简单的朗伯面或具有单一材质的平整表面,没有考虑到实际表面存在褶皱,使得仿真结果与实测结果存在较大偏差[5]。

Abstract

Due to the influence of the external environment, the satellite''s surface is often irregularly folded, and these folds have some influences on the optical properties. So folds need to be taken into account in the modeling of the optical characteristics of space objects. However, a large number of surface cells in fold surface will lead to a dramatic increase in computational complexity. This paper considers pleats as a kind of ‘material’. A method based on macroscopic optical scattering cross section measurement is proposed to obtain the bidirectional reflectance distribution function (BRDF) data of the fold material. Furthermore, the error back propagation neural network is used to establish BRDF model of fold material, which replaces the complex modeling process of folds and greatly simplifies the calculation. The problem of poor real-time performance is solved under the acceptable accuracy. By combining the experiment with the simulation to compare the BRDF model designed in this paper with the traditional BRDF model, it is verified that the error of the model designed in this paper is much smaller than that of the traditional model.

Newport宣传-MKS新实验室计划
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DOI:10.3788/AOS201939.1024001

所属栏目:表面光学

基金项目:国家自然科学基金;

收稿日期:2019-03-04

修改稿日期:2019-05-31

网络出版日期:2019-10-01

作者单位    点击查看

汪夏:航天工程大学研究生院, 北京 101416
张雅声:航天工程大学航天指挥学院, 北京 101416
徐灿:航天工程大学航天指挥学院, 北京 101416
李鹏:航天工程大学研究生院, 北京 101416
张峰:航天工程大学研究生院, 北京 101416

联系人作者:汪夏(627176089@qq.com); 张雅声(lizhizys@263.net);

备注:国家自然科学基金;

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引用该论文

Xia Wang,Yasheng Zhang,Can Xu,Peng Li,Feng Zhang. Bidirectional Reflectance Distribution Function Modeling Approach of Space Objects’ Fold Material[J]. Acta Optica Sinica, 2019, 39(10): 1024001

汪夏,张雅声,徐灿,李鹏,张峰. 空间目标褶皱材质BRDF建模方法[J]. 光学学报, 2019, 39(10): 1024001

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