基于粗糙面双向反射分布函数( BRDF)模型, 考虑海面的影响, 设计了海面舰船目标的紫外光散射亮度计算流程, 讨论分析了海面上舰船目标对海天背景紫外辐射的散射特性。运用大气传输软件 MODTRAN, 计算了 0.3～0.4 .m波段太阳、天空背景的紫外辐射特性；根据粗糙面散射理论, 分别对海面和目标表面进行 BRDF建模, 并讨论了面元的光散射特性；设计了海面舰船目标的紫外光散射亮度计算流程, 并利用此流程计算分析了某舰船模型的紫外光散射亮度。结果显示探测时间、探测方位、舰船表面蒙皮材料、舰船形状、海面散射等因素, 都对舰船目标的紫外光散射特性产生影响, 为完善舰船目标紫外辐射特性数据库提供有效依据。

Based on rough surface bidirectional reflectance distribution function (BRDF) models and considering the sea surface effect, the process for estimating the ultraviolet scattering luminance of the ship target on the sea surface is designed. The ultraviolet scattering characteristics of a ship target in the sea and sky background are discussed and analyzed. First, the characteristics of ultraviolet(UV) radiation from the sun and the sky in the range of 0.3.0.4 .m are calculated using MODTRAN. Second, based on the rough surface scattering theory, the proposed models are built on the surfaces of the sea and target, and the light scattering characteristics of the surface element are discussed. Finally, the process for the estimation and analysis of the ultraviolet scattering luminance of the ship target on the sea surface is designed. The results show that the ultraviolet scattering characteristics of ship targets are affected by factors such as detection time, detection orientation, ship shape, and scattering from sea surface, skin material of the ship surface, among others and also provide for an effective basis to enhance the database of ultraviolet radiation characteristics of ship targets.