为了提高反鱼雷鱼雷（ATT）激光近炸引信对来袭鱼雷的捕获率,首先根据鱼雷目标的激光反射特性,分析了鱼雷目标回波功率随激光束入射角度和入射位置的变化规律。采用空间解析几何方法描述了ATT与来袭鱼雷的交会模型,给出了任意交会距离和姿态时目标回波功率计算方法。根据系统最小探测功率,建立了水中单光束扫描激光引信捕获率蒙特卡罗仿真模型,仿真了系统捕获率随激光脉冲频率的变化关系,获得了探测不同距离目标的最大捕获率和相应的激光扫描频率和脉冲频率。结果表明：当激光扫描频率为15 Hz,脉冲频率为4 kHz,系统能可靠捕获距离9 m内目标。所得系统捕获率仿真模型和结果可为ATT单光束扫描激光引信系统设计提供理论参考。

To improve acquisition rate of laser proximity fuze in ATT(anti-torpedo torpedo) in detecting the torpedo target, the changing rules of target echo power with laser beam incident angle and position were analyzed according to torpedo target’s laser reflection characteristics. The rendezvous model of ATT and attacking torpedo was described by using spatial analytic geometry method. And the target echo power calculation method at any intersection distance and attitude was given. The Monte Carlo simulation model of acquisition rate in underwater single beam scanning laser fuze was established based on system minimum detecting power, and the system acquisition rate changing with laser pulse frequency was calculated. The maximum acquisition rate and corresponding laser scanning frequency and pulse frequency were obtained when the target was at different distance. The results showed that the system can reliably acquire the target at a distance of 9 m, when the laser scanning frequency is 15 Hz, and the pulse frequency is 4 kHz. Thus, this work can provide a theoretical basis for designing the single beam scanning laser fuze of ATT.