摘要
为了精确计算空间目标光学特性,基于区域分解和网格划分的方法建立了空间目标光学特性计算模型。首先把目标表面分解为若干材料属性单一且易于数学描述的区域;对划分后的区域进行网格划分;对划分后的网格面元进行遮挡与掩蔽分析,给出有效面元的判断准则;最后结合表面材料的双向反射分布函数建立了目标的光学特性计算模型。为了验证计算模型的精确性,搭建了空间目标缩比模型测量平台。当入射天顶角为10°、20°和30°时,缩比模型理论计算结果与实验测量数据的相对均方根误差分别为8.89%、9.39%和8.00%,均小于10%,验证了所建目标光学特性计算模型的准确性。
In order to calculate the optical characteristics of the space target accurately,a calculation model of optical characteristics based on domain decomposition and surface mesh-creating is established.Firstly,target surface is decomposed into regions with unique material characteristics and simple mathematic description,and local region surface mesh-creation is decomposed.Then the shadowing and masking are analyzed for surface elements,and the judgment criterion is put forward.Finally a calculation model combined with the BRDF of surface materials for optical characteristics is established.A measurement platform with scaled model is constructed in order to verify the accuracy of the calculation model.The relative RMS errors between theoretical results and experimental data for scaled model are 8.89%,9.39% and 8.00%,which are less than 10%,respectively corresponding to the incident zenith angle 10°,20°and 30°.Result shows that the model has excellent performance in accuracy.
出处
《航天返回与遥感》
2012年第2期81-87,共7页
Spacecraft Recovery & Remote Sensing
基金
国家自然科学基金项目(61007008)
关键词
光学特性
网格化
遮挡
掩蔽
模型计算
空间目标
optical characteristics
mesh-creating
shadowing
masking
model calculation
space target
