基于气象学和传热学的城市建筑物红外成象模型

城市建筑物的红外特点仿真在国际军事上具有重大的意义。本文从气象学和传热学原理出发，对影响建筑物红外特性变化的各因素做了详尽的分析，首先计算了在某一气象条件下建筑物各部分逐时的日辐射强度，再用一维传热有限差分等方法求解建筑物的顶层、墙壁、窗玻璃水泥路、沥青路和土壤等不稳定传热而得到的随时间变化的外表现温度，最后绘制出不同时刻不同俯视角度的物红外图形，与经外测温计实测比较，本模型的结果与之相当吻合。

An Infrared Image Synthesis Model of City Building Based on Meteorology and Heat Transfer

The infrared signature simulation of city buildings has great significance in the National Defense and military affairs. In this paper we analyze all kinds of factors affecting the change of the infrared signature of city buildings based on the principles of meteorology and heat transfer in detail. The proposed algorithm first calculates the intensity of solar radiation on every party of the building in a certain meteorological condition. By using the method of finite difference in one dimension, etc., we then calculate the outer surface temperatures of the top level, the walls, the window glass of the building, the concrete roads, the asphalt road and the soil due to instability heat transfer which change with time. Finally our algorithm draw the infrared images of the building at various time and from different views of looking down. Compared with values from field test using infrared thermometer, the results of our model are quite satisfied.