吸波材料覆盖直升机强散射源RCS缩减分析  

RCS Reduction Analysis of Helicopter’s Strong Scattering Source Covered with Absorbing Materials

作　　者：程健来 孔祥鲲 费钟阳[2] 招启军 CHENG Jianlai;KONG Xiangkun;FEI Zhongyang;ZHAO Qijun(Key Laboratory of Radar Imaging and Microwave Photonics,College of Electronic and Information Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China;National Key Laboratory of Helicopter Aeromechanics,College of Aeronautics,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学电子信息工程学院雷达成像与微波光子技术教育部重点实验室,南京210016 [2]南京航空航天大学航空学院直升机动力学全国重点实验室,南京210016

出　　处：《南京航空航天大学学报》2024年第2期217-226,共10页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金(62071227);航空科学基金(20220018052002);南京航空航天大学雷达成像与微波光子技术教育部重点实验室开放基金(NJ20220005)。

摘　　要：针对武装直升机的宽带隐身问题,提出利用射线追踪和逆合成孔径雷达(Inverse synthetic aperture radar,ISAR)成像确定直升机强散射源位置的方法,形成电磁超构材料和磁性材料一体化设计直升机部分强散射源的隐身设计构想,并计算分析了两款隐身材料加载后对整机隐身效果的影响。首先,分析等效媒质理论、射线追踪与ISAR成像原理。然后,通过射线追踪以及ISAR成像的计算,精确且直观地捕获强散射源部位。最后,给出了两款材料的反射系数并分析加载直升机后单站雷达散射截面(Radar cross section,RCS)变化。计算结果表明,两种不同类型隐身材料覆盖直升机强散射源部位后可以达到局部角域范围内RCS缩减的目的,为隐身材料和直升机蒙皮及旋翼的融合设计提供了参考。In response to the broadband stealth challenges faced by armed helicopters,this paper proposes a method that utilizes ray-tracing and inverse synthetic aperture radar(ISAR)imaging to pinpoint the locations of strong scattering sources of the helicopter.The paper introduces a conceptual design that integrates electromagnetic metamaterials and magnetic materials into the strong scattering source regions of the helicopter.The stealth effects are calculated and analyzed after incorporating two types of stealth materials onto the helicopter.The paper firstly analyzes the principles of equivalent medium theory,ray-tracing and ISAR imaging.Subsequently,through the calculations of ray-tracing and ISAR imaging,the locations of strong scattering source can be captured accurately and intuitively.Finally,the reflection coefficients of the two types of stealth materials are presented and mono-station radar cross section(RCS)changes are analyzed after materials are loaded on the helicopter.The calculation results show that the two different types of stealth materials can achieve the RCS reduction in the special angular domain after covering part of the helicopter’s strong scattering source,providing a reference for the integration design of stealth materials,helicopter skins and main-rotors.

关 键 词：直升机 雷达散射截面 射线追踪 逆合成孔径雷达成像 电磁超构材料 磁性材料 

分 类 号：V218[航空宇航科学与技术—航空宇航推进理论与工程]