Speed detection of hard targets based on 1.55μm coherent lidar systems

In order to realize coherent detection of speed of hard targets,a coherent system was designed with a balanced detector introduced to optimize the value of the local oscillator,and the speed of a diffusive hard target was detected.The result demonstrated that the signal to noise ratio of the system was efficiently improved with the balanced detector,the average speed accuracy of the hard target was about 0.49m/s,variance of detection was 0.91m/s,and this system made the coherent detection of the speed of a diffusive hard target.The outcome is useful for research of coherent wind lidar.