光学 精密工程, 2018, 26 (5): 1028, 网络出版: 2018-08-14
长波红外相机在轨扫描成像畸变消除控制策略
Control strategy for distortion elimination of long-wave infrared camera on-orbit scanning imaging
长波红外相机 变焦扫描 消畸变 多电机位置同步 long-wave infrared camera zoom scanning distortion elimination multi-motor position synchronization
摘要
为消除长波红外相机在轨扫描成像的地面畸变, 研究了变焦扫描成像畸变消除系统控制技术。针对变焦扫描控制的多电机位置同步要求, 提出一种高精度多电机位置同步算法。依据设计的变焦扫描成像控制原理, 设定每个扫描时刻点变倍组电机和补偿组电机的同步位置。变焦控制系统实现与扫描控制系统的同步计时, 根据当前位置和下一时刻的同步位置, 每隔0.01 s计算出电机的运行速度, 实时对电机的速度进行控制。实验结果表明, 变倍组和补偿组电机的位置同步偏差分别在±0.003 mm、±0.002 mm以内; 沿轨方向地面分辨率的最大偏差不超过±0.047 m。长波红外相机在连续变焦扫描控制过程中成像清晰, 达到消除畸变的效果, 满足变焦扫描成像的要求。
Abstract
The control technology of a distortion control system for zoom scanning imaging was investigated to eliminate ground distortion of a long wave infrared camera on-orbit scanning imaging. A high-precision multi motor position synchronization algorithm was proposed taking the multi motor position synchronization of zoom scanning control into consideration. The synchronous positions of the zoom group motor and the compensating group motor at each point of the scanning time were set according to the design principle of zoom scanning imaging control. In particular, the zoom control system was designed to realize synchronous timing with the scanning control system, calculate the running velocity of the motor every 0.01 s according to the current position and the next moment synchronous position, and control the velocity of the motor in real time. The experimental results show that the position synchronization errors of the zoom group motor and the compensating group motor are within ±0.003 mm and ±0.002 mm, respectively, and the maximum ground sample resolution deviation in the track direction is within ±0.047 m. The images obtained from the long wave infrared camera in the process of continuous zoom scanning control are quite clear, and the distortion has been significantly eliminated, thus realizing zoom scanning imaging.
刘小勇, 张宗存, 曹开钦, 孙德新, 刘银年. 长波红外相机在轨扫描成像畸变消除控制策略[J]. 光学 精密工程, 2018, 26(5): 1028. LIU Xiao-yong, ZHANG Zong-cun, CAO Kai-qin, SUN De-xin, LIU Yin-nian. Control strategy for distortion elimination of long-wave infrared camera on-orbit scanning imaging[J]. Optics and Precision Engineering, 2018, 26(5): 1028.