High-Precision Light Spot Position Detection in Low SNR Condition Based on Quadrant Detector
文献类型：期刊论文
| 作者 | Yu, Jiawei3,4; Li, Qing2,3,4; Li, Hongwei2,3,4; Wang, Qiang3; Zhou, Guozhong3; He, Dong3; Xu, Shaoxiong3; Xia, Yunxia3; Huang, Yongmei3,4 |
| 刊名 | APPLIED SCIENCES-BASEL
 |
| 出版日期 | 2019-04-01 |
| 卷号 | 9期号:7 |
| 关键词 | free space optical communication quadrant detector light spot detection Kalman filter real-time calculation |
| DOI | 10.3390/app9071299 |
| 文献子类 | 期刊论文 |
| 英文摘要 | In free space optical communications, long-distance transmission leads to the attenuation of beacon light, where we adopt a quadrant detector (QD) to receive the weak signal. However, the background light interferes so strongly that the output signal-to-noise ratio (SNR) of QD is at a low level, which causes a decrease in accuracy of the direct detection method. This requires finding a new light spot detection method, so an improved detection method is proposed. Because the dark current noise and the background light noise are both white noise, we adopt a Kalman filter to estimate the real output of four electric signals of QD. Unfortunately, running these through an amplifier introduces some direct current (DC) offsets into the signals. In order to balance the effect of the DC offsets, we consider using the modulation method, where we employ a sine signal to modulate the intensity of the beacon light at the transmitting end, after which we can give an inverse gain to move the center of signals to near zero to eliminate the DC offsets when we calculate the data. In Kalman filtering, we use the peak values of the signals in every period after the analog to digital converter (ADC) as the elements of the measurement matrix. Experimental results show that even when QD output SNR is about -10 dB, the detection root-mean-square errors decrease by 51.5% using the improved detection method compared with the direct detection method. Moreover, Kalman filtering does not require a large amount of data, which means it works efficiently, can reduce the cost of hardware resources, and is available for the real-time calculation of spot position. |
| 出版地 | BASEL |
| WOS研究方向 | Chemistry, Multidisciplinary ; Engineering, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied |
| 语种 | 英语 |
| 出版者 | MDPI |
| WOS记录号 | WOS:000466547500034 |
| 源URL | [http://ir.ioe.ac.cn/handle/181551/9673]  |
| 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.Univ Elect Sci & Technol China, Sch Informat & Commun Engn, 4 Sect 2 North Jianshe Rd, Chengdu 610054, Sichuan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Opt & Elect, 1 Guangdian Rd, Chengdu 610209, Sichuan, Peoples R China 4.Chinese Acad Sci, Key Lab Opt Engn, Chengdu 610209, Sichuan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Jiawei,Li, Qing,Li, Hongwei,et al. High-Precision Light Spot Position Detection in Low SNR Condition Based on Quadrant Detector[J]. APPLIED SCIENCES-BASEL,2019,9(7). |
| APA | Yu, Jiawei.,Li, Qing.,Li, Hongwei.,Wang, Qiang.,Zhou, Guozhong.,...&Huang, Yongmei.(2019).High-Precision Light Spot Position Detection in Low SNR Condition Based on Quadrant Detector.APPLIED SCIENCES-BASEL,9(7). |
| MLA | Yu, Jiawei,et al."High-Precision Light Spot Position Detection in Low SNR Condition Based on Quadrant Detector".APPLIED SCIENCES-BASEL 9.7(2019). |
入库方式： OAI收割
来源：光电技术研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。