基于Lowtran7的地空探测红外系统作用距离计算

Calculation of infrared system operating distance of ground-based and air-based detection based on Lowtran7

利用基于对比度的红外系统作用距离模型,从作用距离公式中的目标辐射量和大气传输参数出发,分析地基探测和空基探测对应不同探测目标的辐射,利用光谱分割法对目标和背景辐射积分,通过调用Lowtran7大气软件形成大气辐亮度和透过率的数据库。提出一种求解作用距离方程的新方法,并在其基础上建立作用距离计算系统,提高了计算效率和准确性。利用生成的数据库对设定的空中目标和地面目标进行仿真,仿真结果表明不同纬度季节大气组分存在差异,波长对大气传输参数的影响不可忽略,大气辐亮度越强,透过率越小,红外系统的作用距离越小,在同一大气情况下,随着天顶角的增加,作用距离减小,并给出整个天顶角范围内作用距离分布。计算得到的结果与实际数据对比表明建立的作用距离计算系统可以为红外对抗提供合理有效的参考。

The infrared system operating distance model based on the contrast is used?starting from the target radiance and atmospheric transmission in the operating distance formula.The radiance of different detected targets of ground-based and air-based detection is analyzed,and the spectral division method is used for the integration of target and background radiance,the database of atmospheric radiance and transmittance is established by calling the Lowtran7.A new method for solving the operating distance equation is proposed,and the operating distance calculation system is established,which improves the efficiency and accuracy of calculation.The set air and ground target is simulated by using the generated database,the simulation results show that there are differences between different atmosphere conditions of latitudes and seasons,the influence of wavelength on atmospheric transmission cannot be ignored,the stronger the atmospheric radiation,the smaller the atmospheric transmittance,the smaller the infrared system operating distance,in the same atmosphere condition,the operating distance decrease with the increase of zenith angle,and spatial distribution of operating distance is given.The comparison between the calculated results and the measured data shows that the operating distance calculation system can provide a reasonable and effective reference for infrared countermeasure.