摘要
在深入研究主动激光跟踪机理基础上,以精跟踪单元为研究对象,重点探索提高动态跟踪精度的方法和途径.在保持开环捕获时间不变基础上,采用单信标实现不同束散角切换技术来提高检测光斑信噪比;运用CCD伪随机窗口读出技术实现高帧频图像采集,进而实现宽带伺服控制;通过独特设计的高谐振频率二维PZT振镜和功率稳定控制的高精度亚像元细分技术,实现高精度、快速光束指向.在此基础上,提出智能变结构数字伺服控制方法,保证在不同平台振动条件下始终获得最小的跟踪误差.在搭建的实验室半实物仿真平台的实验结果表明,其跟踪精度达3μrad,证实了这些方法的有效性.
This paper puts emphasis on the exploration of the methods enabling to improve the tracking accuracy under the conditions of relative movement and platform vibration for further studying the active laser tracking mechanism of fine tracking assembly（FTA）.Firstly,switching technique which using a single beacon between both different divergence angles is put forward to improve the signal to noise ratio（SNR） of focal spot.Secondly,the high frame rate CCD is achieved after proposing a pseudo random window readout technique.Thirdly,the unique design of high resonant frequency of two-dimensional PZT fast steering mirror（FSM） and sub-pixel subdivision technique with adaptive control of integral time are used to achieve high accuracy and fast beam pointing.Fourthly,the paper puts forward a digit servo control method with intelligent variable structure.Finally,with the hardware-in-loop simulation platform built,the tracking accuracy of 3 μrad is concluded according to experimental results,which verifies the effectiveness of these methods.
出处
《大连海事大学学报》
CAS
CSCD
北大核心
2012年第3期96-100,共5页
Journal of Dalian Maritime University
基金
国家高技术研究发展计划(863)资助项目(2011AA7034054C)
关键词
空间激光通信
粗精复合轴
跟踪精度
半实物仿真平台
space laser communication
coarse and fine compound axis
tracking accurary
hardware-in-loop simulation platform
