摘要
图形电磁计算(GRECO)方法被认为是求解电大尺寸复杂目标的高频雷达散射截面(RCS)最有效的方法之一.将应用于理想导体劈的等效边缘电磁流概念推广到涂覆吸波材料的阻抗劈上,运用物理光学法(PO)和阻抗边界条件(IBC)求解了涂覆雷达吸波材料的表面的RCS计算.同时本文对目标的棱边检测方法进行改进,可以更全面地检测到所有的棱边,并计算其对目标总RCS的影响.计算结果与相关文献进行比较,结果令人满意.
Graphical electromagnetic computing (GRECO) is regarded as one of the most valuable methods of radar cross section (RCS) computation in the high-frequency region. Based on GRECO method, we extended the concept of equivalent edge currents applied in conducting wedges to those with impedance faces and finally applied the physical optics (PO) and impedance boundary condition (IBC) to solve the high-frequency RCS of complex targets coated with absorbing radar materials. The approach to detecting edges was improved so that all edges could be detected, and the influence of edges on total RCS of objects was calculated. Good agreement has been found between the results calculated with the present approach and the related literatures.
基金
国家自然科学基金项目(60371041)
安徽省教育厅重点科研基金项目(2002kj32).
关键词
电磁散射
雷达散射截面
图形电磁计算
吸波材料
electromagnetic wave scattering
radar cross section
graphic electromagnetic computing, absorbing radar material
