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为实现低轨卫星对地面热点区域快速、大范围的成像侦查,对面阵成像摆镜扫描系统的设计进行了研究。基于反射镜摆动扫描展宽相机视场的原理,根据卫星轨道高度、地面分辨率,确定扫描系统采用阶梯式的步进扫描,要求摆镜快速摆动快速稳定。给出了摆镜扫描系统的组成、技术指标和构型,采用TRUM-60旋转行波超声电机作为驱动电机。对设计的摆镜系统建立虚拟样机模型进行仿真,设计的摆镜模态满足系统使用要求。用ADAMS软件对摆镜系统进行动力学仿真分析,摆镜单步运动满足50ms快速摆动、50ms快速停止稳定成像的要求;1个运动周期内摆镜的运动状况与设计要求一致,前1 000 ms内完成10次快摆快稳的步进扫描,回程用时少于200ms,完成1行扫描的时间充裕。设计的摆镜扫描系统能完成面阵扫描,实现宽幅成像。
In order to realize the fast and wide-range imaging detection of low-orbit satellites on hot terrestrial areas, the design of scanning system of surface-mounted imaging pendulum was studied. Based on the principle of mirror wobble scanning to broaden the field of view of the camera, it is determined that the scanning system adopts stepped step scanning according to satellite orbit height and resolution of the ground, and the swinging mirror is required to be swiftly and quickly stabilized. The composition, technical index and configuration of the scanning system are given. The TRUM-60 rotary traveling wave ultrasonic motor is used as the driving motor. The virtual prototype model is set up for the designed pendulum system to simulate. The designed pendulum mode can meet the requirements of the system. Using ADAMS software, the kinematics simulation analysis of the system is presented. The single-step motion of the mirror meets the requirements of 50ms fast oscillation and 50ms rapid stop of stable imaging. The motion of the mirror in one motion cycle is consistent with the design requirements. The first 1000 ms Completed within 10 fast swing fast steady step scan, return less than 200ms, to complete a line of scanning ample time. Design of the swing mirror scanning system to complete the area array scan, to achieve wide imaging.