Study On Light Scattering Characteristics Of Complex Target Components

In this paper,the target of complex armored vehicles and its components are studied.The ray tracing algorithm combined with Monte Carlo method is used to calculate the single and secondary scattering of the target LRCS and the spectral scattering brightness of the target in the visible range.The contribution and influence of component secondary scattering on complex targets are analyzed,and the main sources of secondary scattering are analyzed.At the same time,the complex target model is hierarchically modeled according to the degree of complexity,and the single and secondary scattering results of different complexity models are calculated,and the differences and relative errors between the models are compared.The complex target model is modeled with different terrains,and the spectral scattering brightness in the visible range between the target and the ground object is calculated.First,the two important physical quantities BRDF and LRCS which characterize the target light scattering characteristics and their relationship are introduced.Then the commonly used five-parameter BRDF models are introduced.Three representative typical samples were selected,such as Lambertian white paint samples,mirror-like material satellite yellow coated samples and ordinary rough grass green paint samples,and the parameters were inverted in two typical laser bands.The nuclear-driven BRDF ground object model based on MODIS satellite sensor remote sensing data is introduced,and the BRDF model commonly used in bare land and desert terrain is introduced.The basic principle of ray tracing method is introduced,and the tracking method and the tracking process of light are explained.The Monte Carlo method is applied to the ray tracing process,and the computational efficiency is significantly improved.Taking the basic spherical target as an example,the correctness of the ray tracing algorithm in calculating the target light scattering characteristics is verified.Taking the most common dihedral angle components in complex targets as the research object,the effects of material,BRDF model precision and dihedral angle on the calculation results of dihedral angle components are studied.Then the complex target armored vehicle model is modeled according to the complexity of the model,and the scattering results of different models under different zenith angles are calculated respectively.The calculation results are compared and analyzed.The main source of secondary scattering was analyzed.Separate calculations of the refined components of complex targets reveal that the results are affected by the target size,and the results of the sub-components can be ignored compared to the overall complex target.The relative error between different models is analyzed,and the preliminary conclusion is obtained.Within the error range allowed by the project,certain component deletion for the complex target model is beneficial to improve the computational efficiency.Finally,the spectral scattering brightness of visible targets and components in the visible range is calculated.The complex target and the feature are composite modeled,and the scattering between different features and complex targets is discussed.The results of composite scattering from different features and targets are compared.