海雾中舰船目标的偏振探测能力研究
投稿时间:2020-04-09  修订日期:2020-06-24  点此下载全文
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作者单位E-mail
倪歆玥 中科院上海技术物理研究所 963330909@qq.com 
余书田 中科院上海技术物理研究所  
唐玉俊 中科院上海技术物理研究所 tangyujun879@163.com 
陈凡胜 中科院上海技术物理研究所 cfs@mail.sitp.ac.cn 
基金项目:国家自然科学基金项目(61975222)
中文摘要:在对海面舰船进行红外探测时,海雾作为影响大气透过率的重要因素,会降低舰船目标与海面背景的对比度。随着海雾浓度的增大,目标对比度小于探测阈值,基于传统强度信息的红外探测方法无法探测到舰船。针对上述问题,分析了海雾场景的偏振特征,提出基于海面偏振特性的背景辐射抑制方法来增强目标对比度。首先,分析不同条件下海雾的大气透过率与红外热辐射之间的关系。然后,分析海面辐射的偏振特征,建立场景偏振对比度与强度对比度的数学模型。最后,通过仿真分析不同舰船海面温差、不同探测角度和不同探测高度下阈值透过率(τ_th)和对比度提升倍数(INC)的变化规律。仿真结果表明,随着舰船海面温差和探测角度的减小,INC逐渐增大,强度τ_th始终大于偏振τ_th,且强度τ_th与偏振τ_th的差值逐渐升高。因此,该方法对低大气透过率海雾环境中的舰船探测提供了有益的参考。
中文关键词:红外偏振  对比度提升;阈值透过率;场景仿真;
 
The Research on Polarimetric Detection Capability of Ship Targets in the Sea Fog
Abstract:Sea fog, as an important factor affecting the transmittance of the atmosphere, reduces the contrast between the ship targets and the sea-surface background in the infrared detection of ship targets on the sea. The traditional detection method based on infrared intensity cannot obtain ship targets as the contrast is less than the detection threshold with the increase of sea fog concentration. In view of the above situations, a background radiation suppression method based on sea surface polarimetric characteristics was developed to enhance the contrast according to the polarimetric characteristics of the sea fog scene. First, the relationship between the atmospheric transmittance of sea fog and infrared thermal radiation under different conditions is analyzed. Then, with analyzing the polarization characteristics of the sea surface radiation, a numerical model of the scene based on polarization contrast and intensity contrast was established. Finally, Analyzing the change regulation of threshold transmittance (τ_th) and contrast improvement (INC) under the circumstances of different detection angles, detection heights, and temperature differences between ship targets and sea surface. The simulation result indicates that, INC gradually increases with the temperature difference and the detection angle decrease, along with the difference between the intensity τ_th and the polarization τ_th. but the intensity τ_th is always greater than the polarization τ_th. Therefore, the method provides a useful reference for ship detection in sea fog environment with low atmospheric transmittance.
keywords:Infrared polarization, Contrast improvement, Threshold transmittance, Scene simulation
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