Technique based on surface element of prepositive disposal in predicting RCS of aircraft
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摘要: 飞行器RCS预估计算是隐身技术研究的基础和重要研究内容.论述了利用计算机图形学方法,使用NURBS曲面和Bézier曲面进行飞行器RCS预估计算前置处理的方法.可以实现几何模型的消隐、拼合以及NURBS曲面向Bézier曲面的转化.结果表明该方法不同于以往基于平面元的预估方法,具有消隐效果好、精度高的特点.Abstract: Predicting RCS(radar cross section) of aircraft is the basic and important content of technology. A technique for prepositive disposal in predicting RCS of aircraft by using computer graphic method and NURBS(non-uniform rational B-spline) surface and Bézier surface is presented. The technique can realize the shadowing calculation, regroup of geometrical model and the transfer from NURBS surface to Bézier surface. The result proved that the technique possess the character of good shadow effect and high precision which is differ from former predicting technique which is based on face element.
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Key words:
- flight vehicles /
- curved surface /
- radar cross section /
- non-uniform rational B-spline /
- Bézier surface
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[1] 阮颖铮. 雷达截面与隐身技术[M]. 北京:国防工业出版社,1998.20~55 Ruan Yingzheng. Radar cross section and sealth technology[M].Beijing:National Defence Industry Press,1998.20~55(in Chinese) [2] Domingo M, Rivas F, Perez J, et al. Computation of the RCS of complex bodies modeled using NURBS surfaces[J]. IEEE Antennas and Propagation Magazine, 1995,37(6):36~47 [3] 施法中. 计算机辅助几何设计与非均匀有理B样条[M]. 北京:北京航空航天大学出版社,1994.443~444 Shi Fazhong.Computer aided geometric design & non-uniform rational B-spline. Beijing:Beijing University of Aeronautics and Astronautics Press,1994.443~444(in Chinese) -
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