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采用时域有限差分(FDTD)方法研究了等离子体鞘套包覆目标的电磁散射特性,发展了超高速飞行器及其等离子体鞘套RCS特性并行计算软件。采用发展的软件完成了超高速开槽钝锥后向远区时域特性和0°入射角附近的电磁散射截面积(RCS)的计算分析,并在中国空气动力研究与发展中心的气动物理靶上进行了超高速开槽钝锥体的RCS验证试验。研究表明:在钝锥体表面开环槽并填充透波性能良好的介质材料相当于在钝锥体表面人为地增加了一个散射中心;在低频区和谐振区,开槽后钝锥体的RCS在原值周围变化,而在高频区,钝锥体的RCS在0°入射角附近很宽的范围内均显著增大。
The electromagnetic scattering characteristics of the plasma sheath sheathing target were studied by using the FDTD method and the parallel computing software of the RCS characteristics of the sheath and the plasma sheath of the high speed aircraft was developed. The development of software was used to calculate the time-domain characteristics of ultra-high-speed slotted blunt cones and the electromagnetic scattering cross-section (RCS) near the incident angle of 0 °. At the aerodynamic target of China Aerodynamics Research and Development Center On the ultra-high speed slotted blunt cone RCS verification test. The results show that the open-loop groove on the surface of the blunt cone and the filling of the dielectric material with good wave-permeability are equivalent to artificially adding a scattering center on the surface of the blunt cone. In the low frequency region and the resonance region, Around the original value, whereas in the high frequency region, the RCS of the blunt cone increases significantly over a wide range of angles of incidence at 0 °.