The Research on Polarimetric Detection Capability of Ship Targets in the Sea Fog
投稿时间:2020-04-09  修订日期:2020-06-24  download
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倪歆玥 中科院上海技术物理研究所 
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 
陈凡胜 中科院上海技术物理研究所 
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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Copyright:《Journal of Infrared And Millimeter Waves》