为了模拟红外目标由远及近的飞行过程，结合高变倍比红外连续变焦系统与大口径投影系统设计了一款红外目标模拟系统.连续变焦系统变倍比为20倍，工作波段为8~12 μm，大口径投影系统口径为300 mm，工作温度为-30~40℃.基于对系统参数的计算与分析，通过推导的消热差及消色差方程对材料进行合理选择及光焦度分配，实现了光学被动消热差设计，应用动态光学理论对变焦凸轮运动曲线进行了计算与绘制.系统成像质量分析结果表明，变焦过程中像面稳定，成像质量良好.该系统可以实现高倍率红外目标飞行距离的连续变化模拟，具有变倍比高，体积小，像质好，环境适应能力强等特点.

In order to simulate infrared target flying process from far to near distance, a infrared target simulating system was designed, which is composed of high zoom ratio infrared continuous zoom system and large aperture projection system. The zoom ratio of continuous zoom system is 20×, the working wave-band is 8~12 μm. The large-aperture projection system has effective exit aperture of 300mm, and works under environment of -30~40℃. Based on calculation and analysis of system parameters, the material was reasonably selected and the optical power was distributed from the derived achromatic and athermal equations. Finally, the optical passive athermalized design was acquired. With dynamic optics theory, the zoom cam curve was calculated and ploted. The analysis results of system imaging quality show that the image plane is stable during the zoom process, and the imaging quality is good. The system can realize the continuous simulation of high zoom ratio target flying distance, which has advantages of of higher zoom ratio, compact design and good image quality.