Exploring sub-strong scattering source of canopy of fighter with radar stealth technology

战斗机座舱次强散射源雷达隐身技术研究

Chengdu Aircraft Design & Research Institute, Chengdu 610091, China

Received: 27 May 2021

Abstract

The canopy of a fighter is the main source of electromagnetic scattering, and the achievement of its radar stealth is one of key technologies for developing a stealth fighter. The scattering sources mainly include the scattering in the cavity of the canopy (strong scattering source) and the local structural scattering (sub-strong scattering source). To satisfy the high stealth requirements, it is necessary to reduce the RCS of the sub-strong scattering source of the canopy. This paper studies the sub-strong scattering source of the canopy of a stealth fighter and proposes the canopy's sub-strong scattering source reduction and control measure by applying the basic radar stealth technology, the MLFMM and the RCS test.

摘要

座舱是战斗机主要电磁散射源，实现座舱雷达隐身是隐身战斗机研制过程中的关键技术之一。战斗机座舱散射主要包括座舱内腔体散射(强散射源)以及座舱局部结构散射(次强散射源)，其中腔体散射目前主要通过透明件镀膜及低RCS外形设计来进行控制，但要达到更高的隐身要求，必须对座舱次强散射源的雷达散射截面进行减缩控制(RCSR)设计。以隐身战斗机的棱边结构和螺栓排列结构(座舱典型次强散射源)为研究目标，分析其散射机理，并结合多层快速多极子方法(MLFMM)及微波暗室RCS试验对主要散射源的散射强度进行了评估。进一步运用外形、材料等雷达隐身技术，提出了锯齿结构设计及吸波结构材料应用等针对座舱结构次强散射源的减缩控制措施。经仿真和试验验证，所提出的减缩控制措施有效解决了座舱结构次强散射源的散射问题，进一步提高了座舱雷达隐身性能。