真假目标热特性差异的理论分析

Theoretical Analysis to Thermal Signature Difference of Decoy and Target

根据传热学原理,建立了假目标和真目标的简单传热模型,计算了一日内假目标和真目标温度随时间的变化,结果表明:假目标表面温度可以通过热平衡方程求解;真目标温度日变化受厚度的影响最大,厚度越大,温度变化越平缓,厚度越小,越接近假目标。表面发射率对真目标或假目标温度变化有相同的影响,发射率越低,一日内表面温度就越高。太阳能吸收系数仅在白天具有太阳辐射时对温度有影响,它与发射率对温度的影响刚好相反。

Based on the thermodynamics principle,a simple thermal model of target and decoy is established,temperature changes in a day is calculated by means of the model.The results show that the temperatute of the decoy could be acquired by solving the static equation;the surface temperature of the target is strongly affected by the dimension d.The surface emissivity affects the temperature of the target or the decoy in the same way but the absorbing factor plays the opposite effect on the target or the decoy compared with the emissivity and it affects merely in daylight.