随着国家对水下成像探测、水下资源勘查等应用需求增加，建立符合实际情况的水下光电成像模型，成为目前水下成像研究者的目标。为了探究水下距离选通成像系统性能，建立了距离选通成像系统各个模块调制传递函数模型，以及总的系统调制传递函数模型。对目前市场上主流成像系统所采用的超第二代、第三代像增强器的选通成像性能进行理论对比仿真分析，完成了对水下距离选通成像系统性能模型的仿真。结果表明，前向散射光调制传递函数以及后向散射光调制传递函数随着探测距离以及选通时间的增加呈现逐渐下降趋势，并且前向散射光调制传递函数下降的速度更快；系统调制传递函数随着探测距离、选通时间和空间频率的增加而逐渐下降，并且通过理论模型分析得到典型的第三代像管的性能比超第二代像管的性能在水下距离选通成像过程中更具优势。

As great attention has been paid to the application requirements of the underwater imaging detection nation wide, underwater resources exploration and so on, it has been the target of the underwater imaging researchers to set up suitable underwater photoelectric imaging model. The corresponding modulation transfer function(MTF) and total system MTF model were established to explore underwater range-gated imaging system performance. Through the use of underwater laser range-gated imaging prediction model and programs, the imaging performance of the present market adopted super second generation and generation Ⅲ intensifiers were analyzed in comparison. Results indicate that the forward scattering light MTF and backscattering light MTF show a trend of gradual decline when detection range or gating time is increasing. The forward scattering light MTF declined faster. What′s more, system MTF shows a trend of gradual decline when detection range, special frequency or gating time is increasing. Generation Ⅲ intensifier has more advantages than super second generation intensifier.