海面空中目标的红外偏振辐射特性仿真分析  

Simulation and Analysis of Infrared Polarization Radiation Characteristics of Air Targets Against Sea Surface

作　　者：朱德燕 付晓萱 唐骏伟 刘晓磊[3] Zhu Deyan;Fu Xiaoxuan;Tang Junwei;Liu Xiaolei(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210001,Jiangsu,China;Key Laboratory of Space Photoelectric Detection and Sensing of Industry and Information Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210001,Jiangsu,China;Remote Sensing Satellite General Department of China Academy of Space Technology,Beijing 100098,China)

机构地区：[1]南京航空航天大学航天学院,江苏南京210001 [2]南京航空航天大学空间光电探测与感知工业和信息化部重点实验室,江苏南京210001 [3]中国空间技术研究院遥感卫星总体部,北京100098

出　　处：《光学学报》2023年第12期167-173,共7页Acta Optica Sinica

基　　金：国家自然科学基金(62105145);等离子体物理重点实验室基金(6142A04210211)。

摘　　要：将偏振特性结合到强度信息中可有效提高天基系统对海面背景下空中目标的探测与识别性能,尤其是对于红外隐身目标。针对红外偏振特性、最优探测波段不明的问题,建立了基于天基平台的空中目标红外偏振辐射模型,分析了近红外到长波红外目标的偏振特性。采用偏振度作为评价指标,分析了目标辐射温度、飞行高度和天基探测俯仰角在红外波段中的偏振辐射规律。实验结果表明:对于不同飞行高度、辐射温度的目标而言,目标与海面背景的红外偏振特性在9μm处差异显著,该波长可作为偏振探测的最佳波段;在最佳探测波段,相较于水平偏振而言,目标和背景的差异主要体现在垂直偏振分量上;当天基平台俯仰角为大角度掠地状态时,目标与背景的偏振度差值更大,有利于提高探测性能。Objective The development of spacebased air target detection against sea surface is conducive to improving the country's ocean sensing capability and providing an effective way for the refined detection and identification of distant sea targets.The traditional infrared detection method is greatly affected by environmental factors and is prone to problems such as target submersion in the background.In the case of low contrast between target and background infrared radiation intensity,the combination of polarization characteristic difference with infrared intensity detection can significantly improve the detection and identification capability of the system.With the continuous development of infrared multiband imaging and guidance technology,how to use the polarization characteristics and select the band to be used to improve the target detection capability has become a difficult issue in spacebased air target detection against sea background.In order to improve the infrared target detection performance,in this study,we model the infrared band polarization detection link of airborne targets in the sea surface background,combine the polarization calculation principle,compare the difference of polarization between target and sea surface in different bands,and analyze the effect of target temperature,height,and detection pitch angle on improving the contrast of target/sea surface polarization.The research results can be helpful to improve the infrared polarization detection capability of spacebased sea surface air targets.Methods In this study,simulations are performed to compare and analyze the target and background in the band of 0.7-12.0μm in combination with polarization.Firstly,the radiation transmission link of the space/seabased airborne target detection system is established by combining the reflection model and spontaneous radiation model,and the relevant environmental parameters are obtained by using MODTRAN software simulation.Then,the Sellmeier formula is combined with the reflectivity calculation method

关 键 词：测量 偏振成像 红外特性 海面背景 天基探测 偏振度 

分 类 号：O436.3[机械工程—光学工程] O439[理学—光学]