目标红外辐射包含自发辐射和反射辐射两部分，通过理论建模对目标自发辐射和反射辐射起偏机理进行分析，并得出两者的叠加将会引入消偏。空间目标偏振特性不仅与表面材料、观测角等因素有关，由于空间目标处在一个变动的辐射环境下，在日照区和阴影区，反射辐射和自发辐射的能量分布情况会相差很大，因此空间目标的红外偏振特性也会有较大的变化。对在不同的辐射环境下对空间目标的红外偏振特性进行了建模仿真分析，最后在实验室条件下，对空间目标常用材料进行红外偏振探测实验，并对实验数据进行分析得出结论。

The infrared radiation of targets includes spontaneous radiation and reflected radiation. We analyzed the infrared polarization mechanism based on some theoretical simulation models of spontaneous and reflected radiation, and found the superposition of them leading to depolarization effect. The infrared polarization characteristics of space targets is influenced by materials and view angle, due to the radiation environment of space target is varying with the time. And in the sunshine and shadow regions, the energy distribution between spontaneous and reflected radiation varies greatly, so the infrared polarization characteristics of space targets will have great changes. We created an experimental environment of low temperature and reflected radiation to simulate the environment of shadow regions, and carried out experimental validation and analysis.