距离选通水下激光成像系统是一种基于时间标记原理的水下光电成像系统，它能够有效抑制水体后向散射光的干扰，提高目标探测距离，具有较高的**和民用价值。距离选通水下激光成像系统在对距离未知的目标搜索过程中，准确地设置系统的搜索范围，对于提高距离选通成像系统对距离未知目标的搜索效率具有重要的意义。根据距离选通成像原理，搭建了距离选通成像实验系统，建立了成像系统的几何模型，分析并计算了距离成像系统的最小探测成像距离和最大探测成像距离，给出了最小探测成像距离和系统结构参数之间关系的仿真计算结果，并用实验验证了最大探测成像距离与水体衰减系数之间的关系。

Rangegated underwater laser imaging system is a kind of underwater photoelectric imaging system which is based on the principle of time label. It can effectively restrain the backscatter of water and improve the range of target detection, having preferable military and civil value. In the process of searching underwater target which the distance is absent, it is important that imaging range is well and truly set for improving efficiency of detecting target in the Rangegated underwater laser imaging system. According to the principle of rangedgate imaging, the experimental system of rangegated underwater laser imaging is set up, and geometry model of image system is built too. The minimum image distance and the maximum image distance of the image system are analysed and calculated. The simulation result on the relation of the minimum image distance and the image system configuration parameters is given and the relation of the maximum image distance and the water attenuation coefficient is proved by experiment result.