An improved method for the position detection of a quadrant detector for free space optical communication
文献类型：期刊论文
| 作者 | Li, Qing1,2,3,4; Xu, Shaoxiong1,2; Yu, Jiawei1,2,3; Yan, Lingjie1,2,3; Huang, Yongmei1,2 |
| 刊名 | Sensors (Switzerland)
 |
| 出版日期 | 2019 |
| 卷号 | 19期号:1 |
| ISSN号 | 1424-8220 |
| 关键词 | free space optical communication quadrant detector light spot position detection cyclic cross-correlation |
| DOI | 10.3390/s19010175 |
| 文献子类 | 期刊论文 |
| 英文摘要 | In free space optical communication, a beacon light loses too much energy after a long-distance transmission and faces strong interference from background light. The beacon light illuminated on a quadrant detector (QD) is so weak that the output signal-to-noise ratio (SNR) of a QD is very low, which leads to a significant decrease in the accuracy of the direct position detection method. To solve this problem, an improved light spot position detecting method is proposed. Since the background light and the dark current noise are white noise, we could consider concentrating the energy of QD output signal at a certain frequency point to enhance the output SNR. Therefore, a cosine signal is used to modulate the intensity of a beacon light at the transmitting end. Then the QD output photocurrents are also cosine signals with the same frequency as the modulating signal. Putting the photocurrent signals into a cross-correlation operation with a reference signal, which is the same as the modulating signal, can enhance the QD output SNR at a certain frequency point. Unfortunately, the result of the classical cross-correlation is attenuated with increasing delay. It is hard to detect the amplitude of the classical cross-correlation result. So, we used cyclic cross-correlation to obtain a stable correlation result to detect its amplitude accurately. The experiment results show that even when the QD output SNR is less than −17 dB, the detection root-mean-square error of the proposed method is 0.0092 mm, which is a quarter of the direct position detection method. Moreover, this method only needs a small amount of data to accomplish the calculation and is especially suitable for real-time spot position detection. © 2019 by the authors. Licensee MDPI, Basel, Switzerland. |
| WOS关键词 | SIGNAL ; RANGE |
| WOS研究方向 | Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation |
| 语种 | 英语 |
| 出版者 | MDPI AG, Postfach, Basel, CH-4005, Switzerland |
| WOS记录号 | WOS:000458574600175 |
| 源URL | [http://ir.ioe.ac.cn/handle/181551/9799]  |
| 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.Institute of Optics and Electronics, Chinese Academy of Sciences, No. 1 Guangdian Road, Chengdu; 610209, China; 2.Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu; 610209, China; 3.University of Chinese Academy of Sciences, Beijing; 100049, China 4.School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, No. 4 Section 2 North Jianshe Road, Chengdu; 610054, China; |
| 推荐引用方式 GB/T 7714 | Li, Qing,Xu, Shaoxiong,Yu, Jiawei,et al. An improved method for the position detection of a quadrant detector for free space optical communication[J]. Sensors (Switzerland),2019,19(1). |
| APA | Li, Qing,Xu, Shaoxiong,Yu, Jiawei,Yan, Lingjie,&Huang, Yongmei.(2019).An improved method for the position detection of a quadrant detector for free space optical communication.Sensors (Switzerland),19(1). |
| MLA | Li, Qing,et al."An improved method for the position detection of a quadrant detector for free space optical communication".Sensors (Switzerland) 19.1(2019). |
入库方式： OAI收割
来源：光电技术研究所
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