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首先介绍了基于气泡180°后向散射探测尾流轮廓的简易激光雷达，并给出了获得尾流轮廓的数据处理方法。该方法采用功率谱密度估计来处理气泡激光散射信号，利用三次样条函数进行插值，进而绘出尾流轮廓的等值线图。然后，重点分析了该简易激光雷达的噪声，主要有外部背景光、50Hz 工频及其谐波、射频噪声以及电子系统内部的固有噪声，讨论了最小可探测功率与回波信号光功率的关系。结果表明尾流轮廓的数据处理方法满足噪声水平的要求，所给出的等值线图是合理的。“,”Simple lidar detecting wake profile based on laser backscattering by wake bubbles at 180° is firstly introduced, and the data processing method of wake profile is given. For this method, the power spectral density estimation is used to process the bubble laser scattering signal, and cubic spline interpolation is used to obtain contour map of wake profile. Then the various noises of this simple lidar, including the background light, power frequency of 50Hz and its harmonics, radio frequency noise and inherent noise within the electronic system, are analyzed in detailed, and the relationship of minimum detectable signal power and the echo signal power are discussed. The results show that the data processing method of wake profile meets the demand of the noise level and the obtained contour map is reasonable.