提出了一种能在高海拔区域工作的相干光路的直接探测多普勒激光雷达系统。系统设计借鉴了相干测风激光雷达系统的光路, 利用大气分子散射光进行风速测量, 采用偏振分光棱镜和1/4波片组成光开关, 配合收发合置的望远镜, 简化了直接探测系统的光路, 提高了光路稳定性; 采用腔长固定式的标准具, 脉冲激光器波长为可调谐, 经优化, 调谐范围约10 GHz, 完成了系统的仿真设计和设备选型工作。

A direct detection Doppler lidar system with coherent light path which can work in high altitude area is proposed. Design of the optical path system is improved on the basis of coherent lidar system, the atmospheric molecular scattering light is used for wind speed measurement. The optical path of direct detection system is simplified by photoswitch and monostatic telescope. The photoswitch is composed of polarization splitting prism and 1/4 wave plate. The stability of optical path is improved. The etalon with fixed cavity length is adopted. The wavelength of pulse laser is tunable. The tuning range is about 10 GHz after optimization. The simulation design and equipment selection of the system are completed.