：激光目标回波模拟器是激光制导**系统半实物仿真中的关键设备。激光目标模拟器的关键技术之一是建立激光脉冲时域特性模型。因此，建立了大气湍流对激光脉冲展宽的模型，将大气等效成多层折射率变化的介质，分析了多层介质对激光脉冲的展宽机理，同时根据目标反射特性建立目标反射特性模型, 并对模型做了仿真验证。计算了距离在10 km时，激光发散角1 mrad、激光波长1 064 nm条件下的脉冲展宽最大值为10 ns。最后给出了一个平面目标的模拟数据。研究结果可以应用于激光雷达回波目标模拟器中。

In the hardware-in-the-loop simulation, Laser Target Echo Simulator(LTES) is one of the most important equipment in the Laser Guidance Weapon System(LGWS). The model for the laser pulse features in time domain is a key technology in the LTES. A model of the laser pulse broadening in turbulent atmosphere was constructed. In the model, atmosphere was treated as multi-layer medium with different refractive index. The influence of medium with multi-layer for the laser pulse broadening mechanism, which is propagated in the multilayered medium, was analyzed. Then, the model of the target reflection was also constructed according to the characteristics of the target reflection. Two models were demonstrated by simulation. Moreover, the maximal pulse broadening of 10 ns was obtained when the distance of 10 km, the laser divergence angle of 1 mrad and wavelength of 1 064 nm was assumed. The result of planar target was calculated in final. This model can be applied in the real laser radar echo simulation.