| 引用本文: | 马爽,吴志勇,高世杰,耿天文,吴佳彬.改进的大气激光通信PPM调制解调系统设计[J].哈尔滨工业大学学报,2016,48(5):105.DOI:10.11918/j.issn.0367-6234.2016.05.017 |
| MA Shuang,WU Zhiyong,GAO Shijie,GENG Tianwen,WU Jiabin.Design of modified atmospheric laser communication PPM modulation-demodulation system[J].Journal of Harbin Institute of Technology,2016,48(5):105.DOI:10.11918/j.issn.0367-6234.2016.05.017 |
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| 改进的大气激光通信PPM调制解调系统设计 |
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马爽1,2, 吴志勇1, 高世杰1, 耿天文1, 吴佳彬1,2
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(1.中国科学院 长春光学精密机械与物理研究所, 130033 长春;2.中国科学院大学, 100039 北京)
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| 摘要: |
| 为进一步提高PPM解调的性能，系统以FPGA为主控单元，提出了一种改进的数字锁相环提取时隙同步时钟和快速帧同步提取方案，在传统的数字锁相环中添加了数字滤波器和FIFO缓存单元.结果表明：系统能够精确地调整时隙时钟，调整精度达到0.25π，10 Mbps信号的时隙时钟的抖动量仅为1.5 ns，最终系统实现了10 Mbps的大气激光通信.
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| 关键词: 激光通信 脉冲位置调制 时钟同步 数据与时钟恢复 |
| DOI：10.11918/j.issn.0367-6234.2016.05.017 |
| 分类号:TN929.12 |
| 文献标识码:A |
| 基金项目: |
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| Design of modified atmospheric laser communication PPM modulation-demodulation system |
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MA Shuang1,2, WU Zhiyong1, GAO Shijie1, GENG Tianwen1, WU Jiabin1,2
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(1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 130033 Changchun, China; 2. University of Chinese Academy of Sciences, 100049 Beijing, China)
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| Abstract: |
| In order to improve the performance of PPM demodulation system, we proposed an improved digital phase-locked loop to extract slot synchronization clock and a fast frame synchronization extraction scheme. On the basis of traditional digital phase-locked loop, the digital filter and FIFO buffer unit are added. The results show that the slot synchronization clock can be precisely adjusted. The adjustment accuracy is 0.25π. The jitter of slot synchronization clock is only 1.5 ns in 10 Mbps. Finally the system achieves atmospheric laser communication in 10 Mbps.
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| Key words: laser communication pulse position modulation clock synchronization CDR |
