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在分析实际大气环境参数的差异和目标-背景辐射强度的基础上,利用MODTRAN模式分析了东海、西北区域3.9μm和9.2μm波段的大气透射率和目标背景对比度的逐月分布特征;为了分析实际大气、气溶胶效应对目标-背景辐射传输的综合影响,结合局部地区月平均环境参数进一步探讨了上述两个区域内气溶胶对3.9μm和9.2μm波段的大气透射率和目标背景对比度分布的影响。结果表明,大气温度、水汽混合比等参数对大气透射率和目标背景对比度有影响,东海区域目标背景对比度比西北区域的小;3.9μm处两区域的目标背景对比度不仅比9.2μm处的小,而且受到气溶胶的衰减作用比9.2μm处的强,因此在目标识别中应优先考虑使用9.2μm作为工作波段。
Based on the analysis of the difference of atmospheric parameters and the target-background radiation intensity, monthly distributions of atmospheric transmittance and target background contrast in the 3.9 μm and 9.2 μm wave bands in the East China Sea and Northwest China were analyzed by using the MODTRAN model. In order to analyze the actual Atmospheric and aerosol effects on target-background radiation transmission, the effects of aerosols on the atmospheric transmittance and the target background contrast distribution in 3.9 μm and 9.2 μm wavebands were discussed in combination with the monthly average environmental parameters in the local areas . The results show that parameters such as atmospheric temperature and water vapor ratio have an influence on the contrast of the atmospheric transmittance and the target background. The contrast of the target background in the East China Sea is smaller than that in the Northwest. The contrast of the target background in the two regions at 3.9μm is not only lower than that at 9.2μm, But also by aerosol attenuation than 9.2μm at strong, so in the target identification should be given priority to the use of 9.2μm as the working band.