不同布局无人作战飞机电磁隐身性能分析

Analysis of Electromagnetic Stealth Performance of Unmanned Combat Aircraft with Different Configurations

无人作战飞机是当前研究热点之一,为研究不同气动布局无人作战飞机的隐身性能,分别建立常规布局A、无尾飞翼布局B、三角形飞翼布局C的电磁模型。采用物理光学法,计算了不同状态的雷达散射截面(radar cross section,RCS)散射曲线并分析了分布特点、频率及俯仰角响应特性。结果表明:无人作战飞机的电磁散射特性取决于气动布局和结构形式,也与机翼前后缘、机身、进气道、尾喷口、垂尾等细节设计相关,布局A在前后向均有散射波峰,而采用外形隐身技术的布局B、C无明显散射波峰;频率增加时,各布局不同角域RCS均值减小,布局C前向角域最低为-34.3087 dBsm,俯仰角变化时,受布局结构外形设计影响,算术均值呈振荡变化;布局C在前、后向角域具有最好的多频隐身性能,布局B在前向角域的不同俯仰角隐身性能较好,布局A隐身性能较差。

As the unmanned combat aircraft is one of the current research hotspots,the electromagnetic model A of conventional configuration,model B of tailless flying wing configuration,and model C of triangular wing configuration were established respectively to study the stealth performance of unmanned combat aircraft with different aerodynamic configurations.The radar cross section(RCS)curves of different states were calculated by physical optics method,and their characteristics of distribution,frequency and pitch angle response were analyzed.The results show that the electromagnetic scattering characteristics of unmanned combat aircraft are determined by the aerodynamic layout and structure,and are also related to the detail design of leading and trailing edges of wing,fuselage,inlet,nozzle,vertical tail and so on.There are scattering peaks in nose and rear directions of model A,while as the models B and C adopt shape stealth technology,they have no obvious scattering peaks.When the frequency increases,the RCS mean value of each model in different angular domain decreases,and the value of C in nose direction is as low as-34.3087 dBsm.When the pitch angle changes,the RCS mean value changes oscillatingly,which influenced by configuration design.And configuration C possesses best multi-frequency stealth performance in nose and rear directions,configuration B has better stealth performance in different pitch angles in in nose directions,and configuration A possesses poor stealth performance.