临近空间高超声速飞行器RCS特性研究

首次系统地对升力体外形临近空间飞行器雷达散射截面（RCS）特性开展了研究，主要研究内容包括本体及绕流RCS特性研究，亚密湍流尾迹RCS特性研究和层流尾迹的RCS特性研究等。结果显示：等离子体绕流将降低飞行器后向RCS；亚密湍流尾迹对低频段RCS影响明显，对高频段影响不明显。另外，双站雷达对临近空间高超声速飞行器也会有较好的探测效果。

Research on the RCS Characteristics of Hypersonic Near Space Vehicle

When a near space hypersonic vehicle (NHV) reenters the atmosphere, its scattering characteristics would be significantly changed by the formation of plasma sheath and wake. In this paper, the scattering characteristics of typical hypersonic near space vehicle are studied. Main contents included the RCS simulating of hypersonic vehicle surrounded by plasma sheath, underdense turbulent wake and laminar wake. The results show that the RCS of hypersonic near space vehicle would be decreased by plasma sheath in the back scattering direction. The RCS of hypersonic near space vehicle would be increased by the underdense turbulent wake at low frequency. But with the increase of radar frequency, the effect of underdense turbulent wake would be unobvious. Finally, Low frequency radar and bistatic radar are suggested to detect hypersonic near space vehicle.