C-R Spline Fitting Theory for the RCS Computation \=of Low-Scattering Targets
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摘要: C-R(Catmull-Rom)样条具有直观、稳定、灵活、不需反求控制顶点等优点,特别适用于具有复杂外形的飞行器进行几何描述. 利用 (G1,k=1) Catmull-Rom样条及其张量积曲面对低散射目标进行几何建模,并求解低散射目标爬行波RCS贡献,通过计算结果与实验结果比较,获得令人满意的结果.Abstract: The geometric modelling and electromagnetic scattering characteristics of complex targets are discussed. In order to overcome the insufficiency of some other spline functions, the contour fitting of the targets was made conveniently and correctly by using Catmull-Rom spline fitting function. To the low RCS target, the effect of creeping wave is remarkable and larger than that of facets and wedges in some cases. Based on the C-R spline fitting theory, the problem of computing geodesic has been solved and a practical computing example of Low-RCS target fully proves the validity of the method by using the hybrid method of GRECO(Graphical Electromagnetic Computing) and creeping wave theory. the results can have practical engineering worth.
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Key words:
- radio wave scattering /
- radar /
- model building /
- creeping wave /
- graphical electromagnetic computing
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[1] Tony D D, Brian A B. Geometric continuity, shape parameters, and geometric constructions for Catmull-Rom splines[J]. ACM Transactions on Graphics, 1988, 7(1):1~41. [2]Rius J M, Jofre L. High-frequency RCS of complex radar targets in real time[J]. IEEE Trans Antennas Propagation, 1993, 41(9):1308~1319. [3]汪茂光．几何绕射理论[M]．第2版．西安:西安电子科技大学出版社,1994. [4]廖朵朵,张华军. OpenGL三维图形程序设计[M]. 北京:星球地图出版社,1996.1~13. -
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