基于距离选通原理, 深入分析了水下脉冲传输和探测器选通接收间的时序关系, 建立了较为完善的距离选通时序模型; 基于搭建的水下脉冲激光距离选通实验平台, 设计了专门的模型验证实验。实验与仿真结果的一致性表明：模型能较好地描述水下距离选通成像过程, 预测成像对比度随延迟时间的变化, 可用于实际选通系统的性能预测和优化设计。此外, 还借助模型讨论了各参量对成像对比度的影响, 并介绍了利用距离选通技术直接测量水下脉冲时间展宽的方法。

On the basis of range-gated technology, the temporal relation between laser pulse propagation and gated reception was analyzed, and an integrated underwater range-gated temporal model was proposed. The model was validated via specially designed experiments which were carried out on a home-built underwater laser range-gated platform. The good agreements between the experiments and simulations confirm that the model can predict the variations of image contrasts versus delay time, and can be applied to the performance prediction and optimal design of real systems. Furthermore, the effects of the various parameters on the image contrasts versus delay time were discussed, and the measurement of pulse temporal stretching based directly on range-gated technology was also introduced.