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采用基于点扩散函数的模型分析和基于测试方法的MODTRAN计算两种方法,计算了大气调制传递函数。通过引入大气分层对调制传递函数的影响,给出一种大气折射率结构常数的综合计算方法,修正了大气调制传递函数模型,明确给出了模型中的参数及计算方法。利用MODTRAN软件计算大气调制传递函数的模型并给出了计算方法。以机载成像仪的工作环境为背景对模型进行了仿真分析,讨论了影响调制传递函数的因素,为评价大气对成像仪的影响提供了依据。
Based on the model analysis based on the point spread function and the MODTRAN calculation based on the test method, the atmospheric modulation transfer function was calculated. By introducing the influence of atmospheric stratification on the modulation transfer function, a comprehensive calculation method for atmospheric refractive index structure constants is given, the atmospheric modulation transfer function model is modified, and the parameters and calculation methods in the model are given clearly. MODTRAN software is used to calculate the atmospheric modulation transfer function model and the calculation method is given. Taking the working environment of airborne imager as the background, the model was simulated and analyzed, and the factors affecting the modulation transfer function were discussed, which provided the basis for evaluating the influence of atmosphere on the imager.