为实现大型地面目标红外辐射亮度的外场模拟，研制了一套红外辐射外场模拟系统。采用一种电加热布作为红外辐射材料，将其粘贴于长方形充气靶表面，通过温度控制系统控制电加热布表面温度来实现红外辐射亮度的外场模拟。为提高模拟精度，采用长波热像仪作为温度控制系统中的一个环节，建立了热像仪测温结果与温控系统设定值及环境温度之间的关系公式，为给定辐射亮度条件下红外辐射材料表面温度的设置提供参考。另外，也考虑了靶场环境对红外辐射材料辐射亮度的影响。大量外场试验证明，提出的方法能够在一定精度范围内实现目标红外辐射亮度的外场模拟，其模拟精度换算为辐射温度约为2 ℃。

A new outdoor simulation system on the basis of the electric heating cloth is developed to simulate infrared radiance of outdoor targets.The cloth is taken as an infrared radiant material and appended to a rectangle target filled with air.Then a temperature control system is used to control the surface temperature of the cloth according to the temperature setting and to implement the infrared radiance simulation of outdoor targets.There are two major contributions in the paper.Firstly, uneven distribution of temperature field of the cloth surface is considered and a long wave infrared thermal imager is used as a link of temperature control system.On the basis of many experiments, an expression is concluded on the relation of the temperature measurement results, the setting temperature of control system and the environmental temperature at an experimental scene.This expression can help for setting temperature of the cloth surface through temperature control system according to the giving infrared radiance of targets.Secondly, the influence of the environment at the experimental scene on the infrared radiance of the cloth surface is thought over.By two considerations above,the simulation precision of infrared radiance has been up to 2 ℃.The outdoor experimental results demonstrate that the system could simulate infrared radiance of outdoor targets in a certain range accurately.