摘要
座舱是常规战斗机前向的重要散射源,为研究其散射特性,提出座舱隐身措施的电磁散射影响分析方法。基于某型常规战斗机,建立常规、隐身座舱的战斗机电磁模型,采用物理光学法计算多种状态的雷达散射截面(radar cross section,RCS),分析RCS曲线分布特点、电磁散射的俯仰角和频率响应特性。结果表明:座舱隐身措施明显降低了前向腔体散射,使散射曲线前向波峰消失而向内收敛;俯仰角在一定范围内时,采用隐身座舱后,RCS前向均值约为-20 dBsm(入射频率6 GHz),相对减缩值随俯仰角呈“W”形分布,俯仰角为0°时达到最大值19.788 7 dB;频率增加时,前向RCS均值逐渐降低,而相对减缩值震荡变化,最大可达24.667 4 dB;其余角域上,俯仰角和多频响应特性相对较弱;座舱隐身措施可同时改善常规战斗机前向角域上的不同俯仰角、多频隐身性能。
The cockpit is one of the important scattering sources for conventional fighters in their nose direction.In order to study its scattering characteristics,the analysis method of influence of cockpit stealth measure on electromagnetic scattering was proposed.And the electromagnetic models of fighters with conventional and stealth cockpit were established based on a fighter.The radar cross section(RCS)values in various states were calculated by physical optics method.The distribution characteristics of RCS curves and the response characteristics of electromagnetic scattering on pitch angle and frequency were analyzed.The results show that the cockpit stealth measures significantly reduce cavity scattering in nose direction,so that the peak of scattering curves in nose direction disappears and the curves converge inward.Besides,when the pitch angle is within a certain range,the RCS mean value with stealth cockpit in nose direction is about-20 dBsm(which incident frequency is 6 GHz,and the curves of relative reduction value is distributed in“W”shape with the variation of pitch angle,and the maximum value is 19.7887 dB when the pitch angle is 0°.When the frequency increases,the RCS mean value in nose direction decreases gradually,while the relative reduction values change fluctuatly,and the maximum value is up to 24.6674 dB.And in the remaining angular domains,the response characteristics with pitch angle and multi-frequency are relative weak.And the conventional fighters stealth performance with different pitch angles and multi-frequency in the nose direction of angular domain can be improved by the stealth measures of cockpit.
作者
刘战合
王菁
张芦
石金祥
张璇
LIU Zhan-he;WANG Jing;ZHANG Lu;SHI Jin-xiang;ZHANG Xuan(School of Aerospace,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430070,China;College of Aerospace Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)
出处
《科学技术与工程》
北大核心
2023年第36期15724-15731,共8页
Science Technology and Engineering
基金
国家自然科学基金(11702255)
河南省科技攻关计划(212102210052,232102220029,212102210334)。
