Improved measurement of beacon light angle deviation based on a quadrant detector

doi:10.1117/12.2540987

CORC > 光电技术研究所 > 中国科学院光电技术研究所 > 光电工程总体研究室（一室）

	Improved measurement of beacon light angle deviation based on a quadrant detector
	Li, Qing 1,2,3,4; Xu, Shaoxiong 2,3,4; Peng, Zhenming 1; Huang, Yongmei 2,3,4
	2019
会议日期	July 7, 2019 - July 9, 2019
会议地点	Beijing, China
关键词	Free space optical communication Quadrant detector Beacon angle deviation Fourier Transform
卷号	11341
DOI	10.1117/12.2540987
页码	113410D
英文摘要	Free space optical (FSO) communication need to keep aiming and tracking each other to keep the communication link unimpeded. In this article, quadrant detector (QD) is used to measure beacon angle deviation. But due to the background light and the dark current, the precision of the direct method cannot match the requirement of the angle measurement. To solve this problem, a proposed method based on intensity modulation and Fourier-Transform is adopted to detect the beacon position accurately. We could consider use a cosine signal to modulate the intensity of beacon light at transmitting end. So the QD output photocurrents are also cosine signals with the same frequency. Then, the energy of QD output signal is concentrated at a certain frequency point, so that the signal-to-noise ratio (SNR) at the frequency is enhanced. Finally Fourier-Transform operation can detect the amplitudes of the photocurrents at the certain frequency point which correspond to the energy of the beacon light illuminated to each quadrant respectively. Therefore, we can calculate the beacon spot position accurately. Experiment results show that even when QD output SNR is only -7.66dB, the max absolute error of the proposed method is 0.016mm and is a quarter of the direct method. © 2019 SPIE.
会议录	Proceedings of SPIE 11341 - AOPC 2019: Space Optics, Telescopes, and Instrumentation
会议录出版者	SPIE
文献子类	会议论文
语种	英语
ISSN号	0277-786X
WOS研究方向	Instruments & Instrumentation ; Optics
WOS记录号	WOS:000525828600012
内容类型	会议论文
源URL	[http://ir.ioe.ac.cn/handle/181551/9640]
专题	光电技术研究所_光电工程总体研究室（一室）
作者单位	1.University of Electronic Science and Technology of China, School of Information and Communication Engineering, No.2006 Xiyuan Ave West Hi-Tech Zone, Chengdu; 611731, China; 2.University of Chinese Academy of Sciences, Beijing; 100049, China 3.Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu; 610209, China; 4.Institute of Optics and Electronics, Chinese Academy of Sciences, No.1 Guangdian Road, Chengdu; 610209, China;
推荐引用方式 GB/T 7714	Li, Qing,Xu, Shaoxiong,Peng, Zhenming,et al. Improved measurement of beacon light angle deviation based on a quadrant detector[C]. 见:. Beijing, China. July 7, 2019 - July 9, 2019.