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低纬度地区、相对湿度较大的大气影响了机载红外搜索跟踪(IRST)系统的作用距离。针对此问题,根据低纬度地区近几年的大气资料,从理论上分析了影响大气透射率的主要因素,重点建立了大气透射率数学模型,修正了高度和斜程对大气透射率的影响;通过MatLab软件分别仿真分析了不同季节、不同天气、不同俯仰角以及不同路程和高度时3~5μm波段的大气透射率,与大气透射率计算软件(LOWTRAN7)的仿真结果相比,其误差约为5%,验证了模型的实效性,从而为指导实际作战使用IRST系统提供了理论依据。
At low latitudes, the relative humidity of the atmosphere affects the range of the IRST system. According to the atmospheric data of low latitudes in recent years, the main factors influencing the atmospheric transmittance are analyzed theoretically. The mathematical model of atmospheric transmittance is established, and the influence of altitude and slope on the atmospheric transmittance is corrected. Atmospheric transmittance in different seasons, different weather, different elevation angles and different distances and heights of 3 ~ 5μm were simulated by MatLab software. Compared with the simulation results of atmospheric transmittance calculation software (LOWTRAN7), the error was about 5%, validated the effectiveness of the model, which provides a theoretical basis for guiding the actual combat using the IRST system.