Analysis of scattering from serrated edge plate on aircraft with MLFMA
-
摘要: 为精确求解散射问题,采用混合场积分方程、多层快速多极子算法(MLFMA, Multilevel Fast Multipole Algorithm)和共轭梯度算法的迭代技术,并改进了多极子模式数.金属球双站雷达散射截面(RCS,Radar Cross Section)的算例表明,该方法在保证精度的前提下,降低了内存和计算时间;分析了锯齿边板的电磁散射特性,总结了锯齿边板相对于直边板在不同角域内的RCS减缩特性以及RCS减缩与入射频率变化之间的关系:随着入射频率的增高,RCS减缩效果迅速提高,且垂直极化减缩效果较水平极化减缩效果好.该结论可以用来提高飞行器的隐身性能.Abstract: Combined field integral equation (CFIE), multilevel fast multipole algorithm (MLFMA) and conjugate grads method(CGM) were employed, and a modified truncation number had been presented to gain the precise scattering from objects efficiently and stably. It was exemplified that this new method could reduce memory and computation time at the same accuracy by its application to the bistatic radar cross section (RCS) of sphere. Scattering from serrated edge plates was analyzed. The problem how the RCS reduction of serrated edge plate changes against straight edge plate was discussed in different angle range. The connection between the RCS reduction and incident frequency was also discovered. Results show that the RCS reduction of serrated edge plate increases sharply when the incident frequencies become larger, the RCS reduction effect in vertical polarization is greater than that in horizontal polarization. This conclusion can find its application to improve the stealth performance of aircraft.
-
[1] Song J M, Lu C C, Chew W C, et al. Fast illinois solver code (FISC) [J]. IEEE Antennas and Propagation Magazine, 1998, 40(3):27-341 [2] 胡俊,聂在平,王军,等.三维电大目标散射求解的多层快速多极子方法[J].电波科学学报,2004,19(5):509-514 Hu Jun, Nie Zaiping, Wang Jun, et al.Multilevel fast multipole algorithm for solving scattering from 3-D electrically large object[J]. Chinese Journal of Radio Science, 2004, 19(5):509-514(in Chinese) [3] 黄沛霖,马东立,武哲. 低RCS齿形挂架参数选择研究[J]. 北京航空航天大学学报, 2001,27(3):293-296 Huang Peilin, Ma Dongli, Wu Zhe. Research on parameter selection of low RCS serrated pylon[J]. Journal of Beijing University of Aeronautics and Astronautics, 2001,27(3):293-296(in Chinese) [4] Song J M, Chew W C. Fast multipole method solution of three dimensional integral equation[J]. IEEE Transaction on Antennas Propagation, 1995, 45(10):1528-1531 [5] Song J M, Chew W C. Error anlysis for the truncation of multipole expansion of vector Green-s function[J]. IEEE Microwave and Wireless Components Letters, 2001, 11(7): 311-313 [6] 温剑. 基于快速多极子方法的高效迭代方法及其工程应用 .成都:电子科技大学电子工程学院,2005 Wen Jian. High efficiency iterative technic and it-s application on engineering basing on FMM . Chengdu: School of Electronic Engineering, University of Electronic Science & Technology of China, 2005 (in Chinese) -
点击查看大图
计量
- 文章访问数: 3584
- HTML全文浏览量: 81
- PDF下载量: 1164
- 被引次数: 0
下载:
