In order to study the influence of photocurrent noise on the detection performance of continuous coherent lidar, the waveform of photocurrent spectrum and the problem of lidar noise are studied theoretically and experimentally. When the optical beam is split after the optical fiber amplifier and the wind measurement experiment is carried out, the “crosstalk” is small, the signal-to-noise ratio of the system is high, and the echo data can be effectively obtained; however, the “crosstalk” is large and the signal-to-noise ratio of the system is low when the beam is split after the seed laser and the wind measurement experiment is carried out, so the effective echo data cannot be obtained. According to the research results, a set of nacelle lidar with beam splitting after the optical amplifier was developed. It was installed in the wind farm and tested in the field. The lidar can achieve 86% data acquisition rate. The experimental results show that the beam splitting at different positions affects the delay distance between the signal reflected by the circulator and the local oscillator light, thus affects the magnitude of the photocurrent in the system, and ultimately affects the detection performance of coherent lidar.

为了研究光电流噪声对连续相干激光雷达检测性能的影响，从理论和实验上研究了光电流谱波形和激光雷达噪声问题。当光纤放大器经过光束分离并进行测风实验时，“串扰”小，系统的信噪比高，可以有效获得回波数据。但是，在进行种子激光和风测量实验后进行光束分离时，“串扰”很大，系统的信噪比也很低，因此无法获得有效的回波数据。根据研究结果，研制出一套带有光分离器的机舱激光雷达。它安装在风电场中，并在现场进行了测试。激光雷达可以实现86％的数据采集率。实验结果表明，不同位置的光束分裂会影响环行器反射的信号与本地振荡器光之间的延迟距离，从而影响系统中光电流的大小，并最终影响相干激光雷达的检测性能。