提出了一种基于气泡群后向散射光多普勒频移谱特性的舰船尾流检测方法。利用蒙特卡罗(Monte Carlo)方法对尾流区运动气泡群后向散射激光多普勒频移谱进行了理论模拟，分析了气泡数密度和速率分布对后向散射光信号多普勒频移谱特性的影响。在此基础上，利用差动型激光多普勒探测方法，实验研究了模拟尾流气泡群后向散射光多普勒频移谱特性，实验结果与理论模拟基本符合。研究表明，随着尾流中气泡数密度和速率分布范围的增大，后向散射光信号的多普勒频移谱的幅度、截止频移也随之增大。这证明了激光后向散射多普勒频移谱特性分析法可作为一种有效的尾流检测方法。

A method for ship wake detection is proposed, which is based on the characteristics of the laser Doppler shift spectrum of the backscattering light signal. A simulation of the Doppler shift spectrum because of the moving bubbles in wake is performed by Monte Carlo method. The influence of the bubble population and the velocity distribution on the laser Doppler shift spectrum is analyzed. Using the differential Doppler method, the influence of imitated wake on the Doppler shift spectrum is studied experimentally. Experimental results agree with the theoretical analysis basically. The results show that the amplitude and the cutoff frequency of the shift spectrum will increase with the increasing of bubble population and range of velocity distribution. It indicates the effectiveness of the detection method.