波纹表面金属目标散射特性分析

雷达散射截面的分析与预估是隐身/反隐身领域的一个重要课题.改变目标的几何外形是减小雷达散射截面有效途径之一.从真空中的麦克斯韦方程出发,采用交替隐式的时域有限差分方法以及时域卷积完全匹配层技术.研究了表面波纹对金属目标雷达散射截面的影响,给出了一表面加波纹金属圆柱雷达散射截面.结果表明当波长和波纹宽度相近时,金属圆柱表面加波纹可以在很大的空域角度内使其RCS明显减小.该方法及结果对隐身与反隐身技术的研究具有借鉴价值.

Analysis of Electromagnetic Scattering of Corrugated Metal Target

Analysis and prediction of radar cross section (RCS) have been an important area for stealth/antistealth research. One of the effective ways of reducing RCS is to change the shapes of the targets. Using Alternative Direction Implicit finite-difference time-domain (ADI-FDTD) method and CPML absorbing boundary condition, the present study investigates into the RCS of Corrugated Metal targets and presents a RCS of the corrugated metal column-shaped target. Calculating results have shown that when the wavelength is comparable with the slot width, corrugated surface can reduce the RCS of a metal target significantly in a wide range of azimuth angle near the backscattered direction. The method and results are beneficial to the study of the stealth/antistealth technology.