舰船目标光学特性模型构建

为了给舰船光学特性研究和可探测性研究提供理论基础。为了建立舰船目标光学特性模型。采用BRDF理论分析和计算中的微面元分析法，利用3D MAX软件将舰船表面划分为许多可计算三角形微面。在计算每个三角形微面的散射特性时，选用双向分布函数中适合计算的Cook-Torrance模型。并通过坐标转换将太阳-目标-探测器统一到面元坐标系下以及利用面元几何可见性进行消隐简化了计算量。在计算入瞳处的辐亮度时，分析了大气中分子、分子和气溶胶粒子对可见光散射的影响。最后得到了大气通过率与波长的计算公式。通过分析每个三角形微面在入瞳处的辐亮度，得到了入瞳辐亮度与波长的关系。最后建立了舰船目标光学特性模型，并通过仿真，计算了不同波长下的大气透过率以及入瞳处辐亮度。

Construction of ship target optical properties model

In order to provide a theoretical basis for the research and detection of optical properties of ships. In order to establish the optical characteristic model of ship target. The ship surface is divided into a number of computable triangular microsurfaces by means of the microelement analysis method in the theoretical analysis and calculation of BRDF and the 3D MAX software.When calculating the scattering characteristics of each triangle minivan, choose a double distribution function for computing the Cook - Torrance model. By means of coordinate transformation, the sun-target-detector is unified into the planar coordinate system and the calculation is simplified by using the geometric visibility of the planar element.The influence of molecules, molecules and aerosol particles in the atmosphere on visible light scattering is analyzed when calculating the radiation intensity at the entrance pupil.Finally, the calculation formula of atmospheric pass rate and wavelength is obtained.By analyzing the radiance of each triangular microplane at the entrance pupil, the relation between the radiance and the wavelength is obtained.Finally, the model of ship target optical characteristics is established, and the atmospheric transmittance and radiation luminance at different wavelengths are calculated by simulation.