针对易受敌方红外制导**攻击的地面**目标，模拟并计算出其红外辐射特征。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，运用多层有限差分的数值计算方法计算模拟出目标瞬时温度变化方向图，得出其动态红外特征。在此基础之上，分别研究了地面目标不同部位(顶部与侧面)隐身所需要的表面发射率与温差的关系。分析了在不同温差条件下目标隐身所需表面发射率随时间的变化关系。计算模拟得出目标与背景在一日之中都存在明显的温差，最大温差可达10℃左右。分析得出利用水雾隐身使目标与背景的温差控制在2℃以内可达到良好的隐身效果。

Aiming at the ground military targets which are easy attacked by infrared homing weapon,the infrared radiation signatures of them are simulated and analyzed. By using proper hypothesis,a three-dimensional radiation and convection conjugate heat transfer problem is simplified into one-dimensional heat transfer problem,and with finite-difference techniques,the direction fig of temperature field of the target is calculated and simulated. Based on these,in diffident position of the target (roof and side),the relationship between the convective emissivity needed in stealth and difference in temperature and the relationship of the convective emissivity with time are got. The results show that there is apparent difference in temperature between the target and background,and the max difference in temperature is 10℃. By using water fog stealth to limit the difference in temperature within 2℃,the good stealthy effect is achieved.