CAJ | 학술논문

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。
위료정학계산공간목표광학특성,기우구역분해화망격화분적방법건립료공간목표광학특성계산모형。수선파목표표면분해위약간재료속성단일차역우수학묘술적구역;대화분후적구역진행망격화분;대화분후적망격면원진행차당여엄폐분석,급출유효면원적판단준칙;최후결합표면재료적쌍향반사분포함수건립료목표적광학특성계산모형。위료험증계산모형적정학성,탑건료공간목표축비모형측량평태。당입사천정각위10°、20°화30°시,축비모형이론계산결과여실험측량수거적상대균방근오차분별위8.89%、9.39%화8.00%,균소우10%,험증료소건목표광학특성계산모형적준학성。
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.