地面目标动态红外特征模拟

Simulation of dynamic infrared signature of ground targets

通过合理的假设,将复杂的三维辐射与对流耦合传热问题简化为一维瞬态传热问题,并运用多层有限差分的数值计算方法模拟出目标外表面温度场随时间的变化曲线图与目标波段辐射强度的方向图。在此基础上,根据目标与背景的辐射强度差值,计算出红外成像探测系统对目标的最大作用距离,并绘制出其在探测器工作波段内的方向图。通过比较分析出隐身涂料对作用距离的影响,在3～5μm波段最大作用距离由7km下降为5.5km,在8～12μm波段最大作用距离由13km下降为7.5km。

By using proper hypothesis, a three-dimensional radiation and convection coupling heat transfer problem was simplified into a one-dimensional heat transfer problem, and with finite-difference techniques, the real-time temperature field and infrared intensity variation of the target were also calculated and simulated. Based on these, the max-lock- range of infrared detection system was calculated by the different infrared intensity between background and target, and its directional diagram was drawn. The influence of stealthy coatings on the lock-range of the target was also analyzed. The max-lock-range in 3～5μm reduced from 7km to 5.5km, and the max-lock-range in 8～12μm reduced from 13km to 7.5km.