基于自由曲面的视觉距离连续变化飞行视景显示系统设计

摘要

Visual display system is paramount to flight simulation, considering the requirements of virtual distance for different flight training, an approach of achieving continuous change of visual distance is propose by using freeform sur-face.Each point on the freeform surface correspond to each object distance, and the freeform image surface is made up of all of image point which can be got by macro program of optical software.This freeform surface can achieve the demands of technical indication.The visual display system about continuous change of visual distance was developed with technical indicator: Horizontal field of view 200°, Vertical field of view 50°(20°～ -30°), visual distance froms 10m to infinity.This system has achieved continuous change of visual distance and strong space feeling of depth.The visual resolution is lower than 1' at all location of the field.%视景显示系统是飞行模拟器的重要组成部分,针对不同飞行训练对视觉距离的要求,提出使用自由曲面实现视觉距离连续变化.自由曲面上的每一点都与每一个物距相对应,通过光学设计软件中的宏语言编程方法得到每一个像点,使用所有的像点组成的面即为所求的自由曲面,应用这种面型作为投影屏,可以实现视觉距离连续变化的要求.设计的视觉距离连续变化视景显示系统的技术指标为水平视场200°,垂直视场50° (20°～-30°),视觉距离为10m至无穷远.该系统能够真实的模拟出空间深度感觉,目视分辨率在所有视场位置均小于1′.