偏仰两轴反射镜光电平台通过控制光路中反射镜的转动实现视线的角位置跟踪.实时测量视线和视轴的角误差是完成角位置跟踪的前提.传统的光电稳定平台将探测成像系统安装在稳定平台上,所以目标像在图像平面中的脱靶量等于视线角误差.反射镜光电平台采用探测成像系统和平台分离的结构形式且光路发生折转,使得目标脱靶量不再等于视线角误差.基于光学反射定律和等距坐标变换,对反射镜光电平台的视线角误差计算进行了研究,得到目标脱靶量和视线角误差的映射关系,并且可以将其近似为关于外框架角的旋转变换.通过数值仿真和样机实验验证了分析结果的正确性.%Yaw-pitch two axis mirror electro-optical platform is able to trace angular position of line-of-sight by controlling the rotation of the mirror setting in the optical path. Real-time measurement of the angular error between the line-of-sight and the optical axis is the prerequisite for tracing angular position. Because imaging system is set on the traditional photoelectric stabilized platforms, target undershoot error in the image is equal to the angular error of line-of-sight. Mirror electro-optical platform uses the structure of separation between the imaging system and the platform and reflective optical paths, therefore target undershoot error is not equal to the angular error of line-of-sight any more. Based on the law of reflection and equidistant alternation theory, calculations for angular error of line-of-sight are studied. The mapping relation between the target undershoot error and angular error of line-of-sight is obtained. And the mapping is able to approximate the rotation transformation about the angle of outer frame. The correctness of analysis results is tested by numerical simulations and the prototype experiment.
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