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1.长春理工大学 光电工程学院,吉林 长春 130022
2.长春理工大学 空间光电技术国家地方联合工程研究中心,吉林 长春 130022
3.吉林工程技术师范 学院量子信息技术交叉学科研究院,吉林 长春 130052
[ "李滨宇(1989-),男,吉林长春人,博士研究生,主要从事大气激光通信方面的研究。E-mail:custlby@163.com" ]
[ "佟首峰(1972-),男,吉林长春人,教授,博士生导师,主要从事空间激光通信和现代光电测试技术方面的研究。E-mail:cust0888@163.com" ]
收稿日期:2021-12-29,
修回日期:2022-01-27,
纸质出版日期:2022-03-10
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李滨宇,冯悦姝,滕云杰等.12.7 km水平信道空间激光通信闪烁抑制[J].光学精密工程,2022,30(05):545-554.
LI Binyu,FENG Yueshu,TENG Yunjie,et al.Scintillation suppression along 12.7 km space laser communication horizontal path[J].Optics and Precision Engineering,2022,30(05):545-554.
李滨宇,冯悦姝,滕云杰等.12.7 km水平信道空间激光通信闪烁抑制[J].光学精密工程,2022,30(05):545-554. DOI: 10.37188/OPE.20223005.0545.
LI Binyu,FENG Yueshu,TENG Yunjie,et al.Scintillation suppression along 12.7 km space laser communication horizontal path[J].Optics and Precision Engineering,2022,30(05):545-554. DOI: 10.37188/OPE.20223005.0545.
大气湍流引起的光强闪烁效应会导致信噪比下降,严重影响自由空间光通信的正常工作。空间分集技术能够有效克服这种影响,为抑制12.7 km城市水平信道大气湍流光强闪烁,设计了空间分集接收发射系统,并对分集接收的最大比合并、等增益合并和选择合并方案的抑制效果进行了对比,结果表明等增益合并方案工程实现简单,抑制效果明显,相比于单路信号闪烁指数可降低至40.1%。最后,根据全天闪烁指数变化反演了大气折射率结构常数变化,与PAMELA模型的模拟结果对比,趋势相符。研究结果对提高自由空间光通信质量有着重要意义。
The scintillation effect of light intensity caused by atmospheric turbulence leads to the decline in signal-to-noise ratios, which seriously affects the normal operation of free-space laser communication. Spatial diversity technology can overcome this impact effectively. To suppress the scintillation of atmospheric turbulence over a 12.7 km urban horizontal channel, a spatial diversity receiving and transmitting system was designed. The suppression effects of maximum ratio combining scheme, equal gain combining scheme and selective combining scheme for diversity reception were compared and verified. The results show that the equal gain combination scheme has simple engineering implementation and an obvious suppression effect. Compared with single-channel signal, the scintillation index can reduce to 40.1%. Finally, according to the change of scintillation index throughout a day, the variations of atmospheric refractive index structure constant are inversed. The trend is consistent with the simulation result of PAMELA model. The results have great significance to improve the quality of free-space optical communication.
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