吸波材料覆盖直升机强散射源RCS缩减分析OA北大核心CSTPCD

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.