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作 者:张腾[1] 孟夏莹 高文强 王红丽 牛青林 Zhang Teng;Meng Xiaying;Gao Wenqiang;Wang Hongli;Niu Qinglin(School of Mechanical and Electrical Engineering,North University of China,Taiyuan 030051,Shanxi,China;National Key Laboratory of Scattering and Radiation,Shanghai 201109,China;School of Information and Communication Engineering,North University of China,Taiyuan 030051,Shanxi,China)
机构地区:[1]中北大学机电工程学院,山西太原030051 [2]散射辐射全国重点实验室,上海201109 [3]中北大学信息与通信工程学院,山西太原030051
出 处:《光学学报》2024年第6期198-208,共11页Acta Optica Sinica
基 金:国家自然科学基金(52006203,U22B2045);山西省回国留学人员科研资助项目(2021-113)。
摘 要:多模式探测成为目标探测识别领域重点发展的技术手段之一,其中视距模型的优选成为指导探测器件设计的重要依据。本文以飞翼布局的低特征飞行器为研究对象,采用计算流体动力学(CFD)方法结合辐射平衡壁面模型预测本体温度,结合MODTRAN大气红外衰减数据库,采用视在光线(LOS)法计算考虑壁面遮挡效应的辐射传输,建立基于噪声等效辐照度(NEFD)、最小可探测温差(MDTD)和最小可分辨温差(MRTD)的地基探测视距模型,计算探测系统对低特征飞行器的最大探测距离和最大探测天顶角。结果表明:低特征飞行器在典型飞行工况下的光谱辐射强度在长波波段(8~12μm)较中波波段(3~5μm)辐射积分强度高出2个数量级;NEFD视距模型在长波波段的探测距离高出中波波段近1个数量级,MDTD和MRTD视距模型在中长波波段探测距离基本一致;三种视距模型在长波波段对应的探测能力依次为NEFD>MDTD>MRTD;在中波条件下MDTD视距模型的探测距离最大,对飞行器底部的探测距离约为57km;MRTD视距模型在观察等级为辨认时无法辨别飞行器具体类型。该研究可为低特征飞行器的探测识别以及探测器的设计提供理论支撑。Objective Low signature aircraft adopt active or passive methods to reduce the characteristic difference between themselves and surrounding backgrounds,such as high-temperature component cooling,aerodynamic structure layout optimization,and absorbing coating,which brings great challenges to detection systems.The aerodynamic heating of aircraft is difficult to eliminate,which thus provides a radiant source for the infrared detection system.The development of high sensitivity infrared detectors further promotes the detection of low characteristic aircraft by infrared detection systems.Maximum detection range(MDR)is an important performance indicator of infrared detection systems,which is not only related to the target s infrared radiation characteristics but also closely related to the system s visual range prediction model.At present,most research focuses on analyzing the detectability of targets based on a single visual range prediction model.Especially,with low characteristic aircraft as the research object,there is a lack of research on using multiple visual range prediction models for detectability analysis.Therefore,we take low characteristic aircraft as the research object and conduct research based on multiple visual range prediction models,which can provide theoretical support for the detection and recognition of low characteristic aircraft and detector design.Methods A fly-wing configuration aircraft was taken as the research object.The surface temperature of the aircraft was predicted using the computational fluid dynamics(CFD)method,based on the assumption of a radiative balance wall.The radiative transfer equation(RTE)was solved through the line of sight(LOS)method,taking into account the situation of light being obstructed by the aircraft s skins.The atmospheric transmittance was borrowed from the MODTRAN software.Three ground-based visual range prediction models were established,including noise equivalent flux density(NEFD),minimum detectable temperature difference(MDTD),and minimum resolvable temper
分 类 号:TN215[电子电信—物理电子学]
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