研究了旋光-双反射结构作为星载量子密钥分发终端的精跟踪系统时的反射光偏振态保持情况,分析了反射光面(由入射光和反射光适量确定)不一致导致的反射光子偏振态变化情况,并计算了此时可能引入的量子误码率。根据双反射结构的特点,给出了两个反射镜法线方向与入射光、出射光矢量之间的关系,并据此提出了旋光-双反射结构的卫星精跟踪系统控制算法。 The state of polarization of the reflected light is studied when the optically active structure is used as the tracking system of the satellite-based quantum key distribution terminal. The polarization state of the reflected photons caused by the inconsistencies of the reflected light surface (determined by the appropriate amount of incident light and reflected light) Changes, and calculate the quantum error rate may be introduced at this time. According to the characteristics of the double reflecting structure, the relationship between the normal direction of the two reflecting mirrors and the incident light and outgoing light vector is given, and the control algorithm of the satellite precise tracking system of the optically active - double reflecting structure is put forward.