高超声速锥模型及其尾迹电磁散射实验研究

Experimental investigation on electromagnetic scattering of hypersonic cone and ionization wakes

介绍了利用X、Ka波段雷达系统在中国空气动力研究与发展中心超高速所弹道靶上开展了金属锥模型和开槽锥模型及其尾迹的电磁散射截面积(RCS)实验研究,模型底部直径12mm、半锥角和头部半径分别为12.5°和1.0金属锥模型速度大于6km/s,飞行环境压力为6.8kPa;开槽锥模型速度5.4km/s,飞行环境压力7.5kPa,雷达测量方式为X波段单站,Ka波段单站。实验结果表明:在等离子体绕流场包覆模型时,获得的锥模型单站X波段RCS、单站Ka波段RCS的实验结果与数值计算结果较为吻合;锥模型的单站后向电磁散射主要集中在模型头身部区域,尾迹散射相对较小。

The experiment of measuring radar scattering cross section（RCS） of non-ablation blunt cone models,decoy models and their wakes using monostatic radar on ballistic range is described in this paper.Both X band radar and Ka band radar are measurement patterns for blunt cone models with 12mm base diameter,12.5° half-cone angle,1.0mm head radius and decoy models are same as the blunt cone models.The blunt cone models velocity is over 6km/s,and environment pressure is about 6.8kPa.The decoy models velocity is about 5.4km/s,and environment pressure is about 7.5kPa.The results show that RCS of the models on monostatic radar is obviously changed since appearance of plasma flow field around the models.The monostatic back scattering of the models with plasma flow field is mainly concentrated in the models.