建立了库德式激光通信终端的几何模型，利用三维偏振态追迹算法对其偏振态传输特性进行分析，得出系统偏振态传输矩阵，建立库德式激光通信终端方位、俯仰角与其偏振消光比、相位延迟角的关系。对出射信号光的偏振态进行了数值仿真，结果表明，库德式激光通信终端出射信号光偏振态与终端方位、俯仰角有密切联系，为相干空间激光通信系统的偏振态实时控制提供了参考。

A geometric model of Coude type laser communication terminal is established. Its polarization state transfer characteristics are analyzed by using three-dimensional polarization state tracking algorithm. The system polarization state transfer matrix is obtained, and the relationship between azimuth, elevation angle and polarization extinction ratio, phase delay angle of Coude type laser communication terminal is established. Numerical simulation is carried out on polarization state of the output signal light. Results show that the output signal polarization state of Coude type laser communication terminal is closely related to the terminal azimuth and elevation angle, which provides a reference for real-time control of polarization state in coherent space laser communication system.