HyperMesh辅助FEKO：NASA almond杏仁体RCS仿真

Woo et. al. published measured and simulated results for a range of simple RCS benchmark targets in 1993 [1].

These benchmark targets are NASA almond , ogive, double-ogive, cone-sphere and cone-sphere with gap.

These targets are defined mathematically so it is easy to ensure that the correct shape is simulated during RCS benchmarking.

目前市面上很多商用电磁仿真软件都可以进行RCS仿真 ，FEKO 由于其能够较好的胜任大尺寸目标RCS计算而逐渐得到重视。

本文分别采用FEKO自带的网格剖分和HyperMesh 网格剖分，对结果进行对比，以表明：1.FEKO RCS仿真结果的靠谱程度；2.对于采用第三方有限元前处理软件HyperMesh辅助RCS计算的可能性（其优越性也是可以得到的，本文的模型较为简单不方便说明，可参考文献[2]中采用HyperMesh计算舰船RCS.）。

本文主要为电磁散射 研究者提供参考，关注实现的可能性，其结果不是最优的，可进一步优化。

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Almond杏仁体数学模型如下：

The RCS values for both horizontal (HH) and vertical (VV) polarizations are plotted in dBSM [dB with respect to one square meter] as a function of the azimuthal angle. The elevation angle is zero, and the almond is measured with its broad side flat. Zero degrees azimuth corresponds to incidence on the tip. We chose to plot the RCS pattern at 1.19 GHz because, at that frequency, the almond is approximately one wavelength long.

HyperMesh网格剖分如图所示，将网格文件导出再导入FEKO，进行RCS仿真。

FEKO网格剖分，HyperMesh网格剖分，网格直方图如图所示，这里并未具体考虑网格质量，因此HyperMesh网格数量并不多，也未进一步采用网格优化操作。

在7GHz平面波入射下的水平极化和垂直极化下的单站RCS结果如图所示，两种剖分方式下的结果基本一致，若能增加网格数量、提高网格质量，其结果还可以更加精确。

[1] A. C. Woo, H. T. G. Wang, and M. J. Schuh, "Benchmark Radar Targets for the Validation of Computational Electromagnetics Programs," IEEE Antennas and Propagation Magazine, vol. 35, no. 1, February 1993, pp. 84 - 89.

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[2] 方重华, 宋东安, and 王志雄. "利用hypermesh和feko软件来仿真舰艇RCS." 装备环境工程 5.5(2008):61-64.