为了改进鱼雷激光尾流制导方法，在激光多普勒效应的基础上，建立激光探测舰船尾流的理论模型，并设计出差动型光学系统，使探测器接收到的散射光信号产生多普勒频移，有效提高信噪比。仿真结果表明，通过锁相放大技术处理，能检出待测目标多普勒差频信号，并抑制噪声，在水中兵器领域有应用前景。

In order to improve the guidance method for torpedoes,based on laser Doppler effect,a theoretical model is established for detecting the ship wake with laser. A differential optical system is designed to produce Doppler shift frequency in scattering signal on sensor,which can improve the signal-to-noise ratio efficiently. The simulation results indicate that the Doppler shift signal can be detected by lock-in amplifier technique,and the noise will be limited. The technique has a broad applicative perspective in under-water weaponry.