Radar cross section simulation of metal cone covered with plasma

She Shou, M. Chung
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Abstract

Plasma is known to absorb electromagnetic waves with frequencies below characteristic plasma frequency ωp, and attenuate those with higher frequencies. The absorption capability is proportional to the square root of plasma density, and its effect can be measured in term of its radar cross section (RCS). Such phenomena appear naturally on reentry vehicle which causes radio blackout. Recently investigations on intentionally generated atmospheric or low pressure plasma in front of projectile to reduce its RCS and achieve low probability of interception (LPI) are of interests. We simulate the RCS of a near 20 degree metal cone, and compared it with the one covered by a ball shape plasma in front of it. The results indicated the RCS dependence with frequency is changed, and the RCS decreases at the bore sight direction when the incoming radar signal is below ωp, but may become higher when frequency is higher than ωp. The shape of the plasma is as important as the density in absorption capability. The results imply plasma cloaking is theoretically effective.
等离子体覆盖金属锥体的雷达截面模拟
已知等离子体吸收频率低于特征等离子体频率ωp的电磁波,并衰减频率较高的电磁波。吸收能力与等离子体密度的平方根成正比,其影响可以用其雷达截面(RCS)来衡量。这种现象在再入飞行器上自然出现,导致无线电中断。为了降低弹体的RCS,实现低拦截概率,在弹体前部有意产生大气或低压等离子体是近年来研究的热点。我们模拟了近20度金属锥的RCS,并将其与前面被球形等离子体覆盖的RCS进行了比较。结果表明,RCS与频率的关系发生了变化,当来袭雷达信号低于ωp时,RCS在膛瞄方向上减小,而当频率高于ωp时,RCS可能会升高。等离子体的形状和密度对吸收能力同样重要。结果表明等离子体隐形在理论上是有效的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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