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利用脉冲能量为110μJ、重复频率为20 k Hz及脉冲宽度为300 ns的光纤激光器设计了一套工作波长为1.55μm的相干测风激光雷达,给出了系统的性能参数。根据后向传播本振的原理计算出当望远镜对发射高斯光束的截断比为最优值0.823时,激光雷达的天线效率达到最大值0.422。在最优截断比条件下分析了望远镜口径对相干激光雷达载噪比的影响,优化了望远镜设计。从理论上计算出激光雷达的探测性能指标:探测距离大于3 km,风速测量范围为±62 m/s,距离分辨率为84 m,风速测量精度优于0.1 m/s,时间分辨率为0.5 s。
A coherent wind lidar with a working wavelength of 1.55μm was designed by using a fiber laser with a pulse energy of 110μJ, a repetition frequency of 20 kHz and a pulse width of 300 ns. The performance parameters of the system were given. According to the principle of backward propagating local oscillator, the efficiency of Lidar antenna reaches the maximum of 0.422 when the truncation ratio of the telescope to the Gaussian beam is 0.823. The influence of the telescope aperture on the carrier-to-noise ratio of coherent laser radar was analyzed under the optimal cutoff ratio, and the telescope design was optimized. The detection performance of Lidar is calculated theoretically: the detection range is more than 3 km, the range of wind speed is ± 62 m / s, the distance resolution is 84 m, the wind speed measurement accuracy is better than 0.1 m / s and the time resolution is 0.5 s.