介绍了一套1.06 μm脉冲式相干激光雷达测速演示系统.采用单块非平面环形激光器作为种子，注入到单纵模运转的Q开关高重复频率Nd∶YAG激光器为发射源，实现稳定的单频输出.通过外差式相干探测的方法，利用转速0~60 Hz可调、直径为10 cm的转盘为运动目标，回波信号被带宽为3.5 GHz的高速光电探测器响应后，经采样率为2.5 GS/s的A/D采样，输送到基于LabVIEW信号处理系统中，从而测量不同转速下的多普勒频移，各测速点的多普勒频移测量结果相对误差在3%以内.针对测量中存在的误差从激光器输出线宽和测速系统准确度两方面进行了误差分析，并提出了改进措施.演示系统的良好重复性证实了这种相干激光雷达系统的可行性.

The demo system using 1.06 μm coherent detection lidar for velocity measurement was introduced.One approach is to inject the laser of monolithic non-planar unidirectional ring laser into a high power Q-switch Nd∶YAG laser to obtain pulsed and single-longitudinal-mode laser,simultaneity,to lock the frequency of the Q-switched laser to the master oscillator.Single frequency pulse laser with output power higher than 5 mJ was obtained,and pulse width was 40 ns.The Q-switched laser was used in a heterodyne system to measure the velocity of a turning object.The speed of moving target was observed by the ways of heterodyne detection which measured the Doppler information of moving target.The moving target was a dial whose rotate speed could be modulated between 0~60 Hz.The diameter of dial was 10 cm.The signals would be received by high speed photodiodes whose bandwidth was 3.5GHz,and being sampled at the rate of 2.5 GS/s.The Doppler shift causing by moving target can be measured by the processing system based on LabVIEW.The comparative error of the velocity measurement was less than 3%.The error in the velocity measurement was analyzed in bandwidth of output laser and precision of system.The demo system provides a good repetition in velocity measurement.