座舱及进气道对某飞翼布局电磁散射影响

座舱和进气道对飞行器隐身性能有重要作用。为分析座舱及进气道的散射影响特性,建立了四种包含不同部件的电磁模型,结合物理光学法和雷达截面积(RCS)均值相对增值概念,研究了RCS曲线分布影响、俯仰角响应特性、频率响应特性。结果表明:考虑隐身设计的座舱和进气道不改变散射分布特性,RCS曲线分布特性相似;俯仰角增加,座舱影响较小,进气道、混合座舱和进气道前向、后向、周向角域相对增值震荡性递增,频率增加,座舱对电磁散射影响不大,进气道、混合座舱和进气道的前向、后向角域的相对增值震荡减小。座舱对电磁散射影响较小,前向相对增值位于-2.4～1 dB之间,进气道对电磁散射影响较大,前向相对增值为2～12 dB。

Influence of Cockpit and Inlet on Electromagnetic Scatterings for a Flying-Wing Configuration

The cockpit and inlet play an important role for aircraft stealth performance. In order to analyze the scattering characteristics of cockpit and inlet, four kinds electromagnetic models with different components were established. The influence of RCS curve distribution, response of pitch angle and frequency were studied with Physical Optics method and relative value based on RCS mean. The results show that the scattering distribution is not changed by the cockpit and inlet with consideration of stealth design, and their distributions characteristics are similar. When the pitch angle increases, the RCS relative means of model C and D in nose, rear and circumferential directions increase oscillatorily, and relative means in lateral direction oscillate, and the biggest relative mean of model D in rear direction is 25.1942 dB with the pitch angle of 5 degree. When the frequency increases, the RCS relative means of model C and D in nose, rear and circumferential directions decrease oscillatorily, relative means in lateral direction increase gradually, and the biggest relative mean of model D in rear direction is 22.5722 dB with the frequency of 1GHz. The influence of cockpit on electromagnetic scattering is weak, and the relative value in nose direction is between -2.4 to 1 dB; while the inlet has greater impact on electromagnetic scattering, and the relative value in nose direction is between 2 to 12 dB.