Complex Structure Of Multiple Reflection And Diffraction Of High Frequency Analysis And Calculation,

Multiscatter and diffract is one of the most important mechanism which contribute to the Rador Cross Section (RCS) of the complex target (eg. Plane, missile etc.). Based on the concept of the RCS and the theory of the basic electromagnetic scattering, this dissertation discussed the application of the Physical Optics (PO) to the RCS of bodies modeled with NURBS surfaces, and completed an integrate software with the display, transfer, shelter handling and modification of the models.Focused on the algorithm of RCS computation, this thesis discussed the multiple reflect and diffract problems, and also the condition when the body was coated with RAM. Centered around the multiple reflect problem, this thesis developed the ray tracing method, including the method of facet clipping; In order to calculate the contribution of the edges, it developed the Equivelent Current Method (ECM) method. All the results were compared with the SPM method and Gauss method.On the aspect of the design of the RCS integrative software, the following had been completed: it corrected the existing shelter process module; it developed the computation module include the ray tracing module and the diffraction module. The OpenGL based integratated software with functions of displaying, modification and transformation had been developed under Miscrosoft Visual Studio .NET.