| 基于激光通信链路的星间时间同步技术 |
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| 引用本文： | 朱福南,周黎莎,孙建锋,陈卫标. 基于激光通信链路的星间时间同步技术[J]. 中国科学:物理学 力学 天文学, 2021, 0(1) |
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| 作者姓名： | 朱福南 周黎莎 孙建锋 陈卫标 |
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| 作者单位： | 中国科学院空间激光信息传输与探测技术重点实验室;中国科学院上海光学精密机械研究所空间激光信息技术研究中心;中国科学院空天信息创新研究院;中国科学院大学;中国科学院微小卫星创新研究院 |
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| 基金项目： | 国家自然科学基金重大项目(编号:91938302)资助。 |
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| 摘 要： | 时间同步技术对于导航、定位、授时都有重要作用,是空间应用领域的热门方向.激光通信技术具有通信容量大、保密性和抗干扰性强等优点,因此受到越来越广泛的应用.本文提出了基于激光通信链路的时间同步技术,通过数据帧头实现粗测距,通过接收时钟相位实现精测距.通过理论分析,获得了基于激光通信链路的时间同步精度的理论极限,并进行模拟仿真计算.在双向单程测距条件下,1 Gbps通信速率时可以获得毫米级的测量精度和皮秒级的时间同步精度.采用BPSK相干通信体制,在实验室进行了基于激光通信链路的时间同步试验,结果符合理论预期.
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| 关 键 词： | 激光通信 时间同步 激光链路 同步精度 |
Time synchronization based on intersatellite laser communication links |
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| ZHU FuNan,ZHOU LiSha,SUN JianFeng,CHEN WeiBiao. Time synchronization based on intersatellite laser communication links[J]. SCIENCE CHINA Physics, Mechanics & Astronomy, 2021, 0(1) |
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| Authors: | ZHU FuNan ZHOU LiSha SUN JianFeng CHEN WeiBiao |
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| Affiliation: | (The Key Laboratory of Space Laser Communication and Detection Technology,Chinese Academy of Sciences,Shanghai 201800,China;The Research Center of Space Laser Information Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;University of Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy for Microsatellites of Chinese Academy of Sciences,Shanghai 201203,China) |
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| Abstract: | Time synchronization is essential for navigation,positioning,and timing services.It is widely used in space applications.Laser communication technology is widely used and has the advantages of large communication capacity,strong confidentiality,and anti-interference.In this paper,a time synchronization technique based on laser communication links is proposed.Estimate ranging was realized using the data frame head,and precise ranging was realized by receiving the clock phase.Through theoretical analysis,the theoretical limit of time synchronization accuracy based on laser communication links was obtained,and simulation was performed.Millimeter-level measurement accuracy and picosecond-level time synchronization accuracy can be obtained at a communication rate of 1 Gbps under two-way and one-way ranging conditions.A time synchronization test based on laser communication links was conducted in a laboratory using a coherent binary phase shift keying communication system;test results are consistent with theoretical expectations. |
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| Keywords: | laser communication time synchronization laser link synchronization precision |
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