各向异性粗糙海面的红外反射特性研究

摘要

The disturbance of sea surface affects the performance of infrared system, and the research on infrared radiation of sea surface is important to design and assess the IR system. Infrared reflectance of anisotropic rough sea surface is calculated based on Cox-Munk model. With considering wind speed and wind direction and detector direction, a method to compute infrared reflectance of sea surface is deduced, and reflectivity and emis-sivity of sea surface is obtained. Infrared reflectance of sea surface is computed in middle wavelength and long wavelength with this method, and the method of calculating infrared reflectance of sea surface is applicable as the data source in the infrared characteristic analysis, detection and simulation for the ocean background.%海面背景的干扰影响着红外系统的探测、识别性能,海面的红外辐射研究对于红外系统的设计、使用和评估具有十分重要的意义.基于Cox-Munk模型对海面的红外反射率进行了分析计算,全面考虑风速、风向、遮挡效应、入射方向、观测方向等各种影响,建立海面红外反射模型,推导出各向异性粗糙海面的红外反射率计算方法,并计算出海面的红外反射率和发射率.利用该计算方法,计算了中波(3-5μm)和长波(8-12μm)海面的红外反射率,分析了反射率随风速、风向、入射方向的变化情况,该计算方法可以为海面背景的红外特性分析、探测及仿真提供参考数据.