The Rcs Of Complex Models Based On Nurbs Surfaces

The Radar Cross Section is a very important parameter of the radar target and how to exactly compute the Radar Cross Section always is an electromagnetics researchful important problem which directs design of the aerocraft shelter, therefore researching on developing the software of computing the complex models RCS has the quite high research and practicality value.Based on the concept of RCS and requirement of RCS software, this dissertation analyzes how to compute RCS of Non-Uniform Rational B-Spline surface models by Physical Optics and the scatter of model obverse inducting current by Stationary Phase Method, respectively detailedly discusses model source, primarily treated with and shadow complex model of compute software. The main researchful content of this dissertation:Firstly, based on analysis of some fashion international data standard, the data-exchange interface on Initial Graphics Exchange Specification (IGES) for the computing RCS software is realized, achieving the data exchange between the CAD model building system and the computing software.Secondly, primarily treating with computing model has been done that included wiping off knots by anti-count and reducing high degree surface rank by Chebyshev multinomial approach this expressly achieves a new choosing data point means that reducing amount of the NURBS changed into Bezier and improving precision and efficiency of computing RCS.Finally, realizing the surface shadow has been done that is the dissertation reasearchful pivotal problem which respectively analyzes "Catmull Surface Division" method and "Weley-Altherton Trimmed Surface" method, expressly achieves "Catmull Surface Division" method that solves Z-Buffer computing bottle-neck by a radial method.This dissertation also respectively tested the shadowing module and the whole computational RCS software and the results compares with measure and other method results.