星载周扫式跟踪转台运动轴与光轴关系的建模分析

Modeling Analysis on the Relationship of Motion Axis and Optical Axis in Circular-scanning-type Tracking Turntable Carried by Satellite

星载周扫式跟踪转台作为激光通信装置,通过扫描的方式确定目标,建立链路,实现捕获、对准、跟踪功能。由于通信装置在传递信息过程中要实时跟踪,跟踪转台作为通信终端,其瞄准姿态会随着通信终端之间的相对位置变化而发生变化,这就要求确定跟踪转台的运动轴与光轴之间的运动规律。文中利用向量旋转与坐标变换理论,将反射镜的旋转看作是坐标系旋转,通过旋转矩阵,建立数学模型,计算出在指向和跟踪过程中运动轴与光轴关系运动规律的数学表达式,为转台机构的实际设计奠定基础。文中提出的方法对类似的激光通信系统具有借鉴意义。

As the laser communication device,circular-scanning-type tracking turntable carried by satellite identifies the target by scanning, establishes a link, and finishes acquisition, pointing and tracking. As communication terminal, it needs real-time tracking in the process of passing information and its posture will change as the relative position changes between the communication terminals, which requires finding out the movement regulation between the motion axis and optical axis of the turntable. According to the theory of vector rotating and transformation of coordinate system, we serve the rotation of the mirror as a coordinate rotation, then use the rotation matrix to establish mathematical model and calculate the motion relationship mathematical expressions of motion axis and optical axis in the process of pointing and tracking. The formula lays a foundation for practical physical design of the turntable. The method supplies some reference helps for the study of the laser communication system.