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Realization of FTA with High Tracking Accuracy in FSO
Author(s) -
Lv Chun Lei,
Li Yan,
Zhang Yun Feng,
Jiang Hui Lin,
Tong Shou Feng
Publication year - 2015
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1002/asjc.1149
Subject(s) - tracking (education) , realization (probability) , computer science , frame (networking) , frame rate , window (computing) , free space optical communication , real time computing , electronic engineering , computer vision , engineering , optical communication , telecommunications , operating system , psychology , pedagogy , statistics , mathematics
High tracking accuracy is a prerequisite of reliable space optical communication links and its effective means is the utilization of coarse and fine compound‐axis structure. After an in‐depth study of the active laser tracking mechanism of fine tracking assembly, this paper emphasizes the exploration of these methods enabling the improvement of tracking accuracy under the condition of relative movement and platform vibration. Firstly, switching technique using a single beacon between different divergence angles is put forward to improve the signal to noise ratio (SNR) of the focal spot. Secondly, the high‐frame rate charge‐coupled device is achieved after proposing the pseudo random window readout technique. Thirdly, the unique design of the high resonant frequency of two‐dimensional PZT fast steering mirror (FSM) and sub‐pixel subdivision technique with adaptive control of integral time is used to achieve high accuracy and fast beam pointing. Fourthly, this paper puts forward a digital servol control method with intelligent variable structure. Finally, after building a hardware‐in‐loop simulation platform, the tracking accuracy of 3μrad is concluded according to simulation experimental results.