鉴于复杂大气条件下的红外系统作用距离难以精确、实时地计算，提出一种建立红外系统作用距离实时计算系统的方法。通过将MODTRAN软件与基于光谱等分法建立的红外系统作用距离模型有机地结合起来，实现对于MODTRAN软件自动写入配置及调用计算，简化了大气模型的配置方法，并能够自动读取MODTRAN 生成的结果输出文件。对某探测目标在不同海拔高度（1 km～6 km）及不同降雨强度（0 mm/h～4 mm/h）下红外系统作用距离进行计算，结果表明：探测高度的变化对于红外系统作用距离有比较明显的影响，其中在1 km～3 km探测高度范围内，探测距离变化尤为明显。降雨对于红外系统作用距离影响巨大。降雨强度为1 mm/h时，红外系统作用距离衰减为无降雨时的50％。当降雨强度大于3 mm/h时，作用距离趋于稳定。%It is hard to calculate the operating distance of infrared system accurately in real time in the complex atmospheric conditions ,so we proposed to build a real-time calculating system . MODTRAN software was combined with the operating distance model based on spectral bisec-tion method of infrared imaging system .This system realized automatically written configura-tions for MODRTRAN software to simplify the configuration method of atmospheric model . Configuration file generated from MODTRAN was automatically read .The infrared system op-erating range of a target was calculated at different altitudes (1 km~6 km) and with different rainfall intensity (0 mm/h~4 mm/h) .The results show that the variation of the measuring height has obvious influence on the infrared system operating distance ,and the influence is great at 1 km~3 km;the rainfall has huge impact on the infrared system operating distance ,the oper-ating distance attenuates to half of that with no rainfall when the rainfall intensity is 1mm/h ,and the operating distance tends to stable w hen the rainfall intensity is more than 3mm/h .
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