Article(id=1241060182478869178, tenantId=1146029695717560320, journalId=1238841944844054536, issueId=1241060178263601474, articleNumber=null, orderNo=null, doi=10.12347/j.ycyk.20231219002, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1702915200000, receivedDateStr=2023-12-19, revisedDate=1675785600000, revisedDateStr=2023-02-08, acceptedDate=null, acceptedDateStr=null, onlineDate=1773821405286, onlineDateStr=2026-03-18, pubDate=null, pubDateStr=null, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773821405286, onlineIssueDateStr=2026-03-18, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773821405286, creator=13701087609, updateTime=1773821405286, updator=13701087609, issue=Issue{id=1241060178263601474, tenantId=1146029695717560320, journalId=1238841944844054536, year='2024', volume='45', issue='2', pageStart='1', pageEnd='123', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773821404281, creator=13701087609, updateTime=1773821891324, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241062221128724613, tenantId=1146029695717560320, journalId=1238841944844054536, issueId=1241060178263601474, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241062221128724614, tenantId=1146029695717560320, journalId=1238841944844054536, issueId=1241060178263601474, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=68, endPage=74, ext={EN=ArticleExt(id=1241060182793441988, articleId=1241060182478869178, tenantId=1146029695717560320, journalId=1238841944844054536, language=EN, title=Research on Frequency Acquisition of Low Signal-to-Noise Ratio and Large Frequency Offset Space Optical Signal, columnId=1239133503154081962, journalTitle=Journal of Telemetry, Tracking and Command, columnName=TT & C Communication and Navigation, runingTitle=null, highlight=null, articleAbstract=
In the signal demodulation process of the satellite coherent optical communication system, the relative motion of the satellite will cause the received signal light to produce a Doppler frequency shift of GHz magnitude. The long-distance transmission of the signal light leads to an extremely low optical signal-to-noise ratio. The traditional method cannot compensate for the large-scale Doppler frequency shift at a low signal-to-noise ratio, which seriously affects the ability of the communication system. In view of the above problems, this paper proposes a two-stage frequency acquisition algorithm, which includes two stages: automatic frequency sweeping and frequency locking control. In the automatic frequency scanning stage, the frequency difference is reduced to the order of 100 MHz by the local oscillator's automatic frequency scanning. In the frequency locking control stage, the frequency difference is further reduced to the MHz level at a low signal-to-noise ratio through high-precision local oscillator frequency control and FFT transformation. The simulation results show that the algorithm can compensate for the Doppler frequency difference in the 10 GHz range of the large dynamic range under the 2 dB signal-to-noise ratio, and meet the demodulation requirements of the satellite cohe-rent optical communication.
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卫星相干光通信系统信号解调过程中,卫星相对运动会导致接收的信号光产生GHz量级的多普勒频移,信号光的远距离传输导致光信噪比极低,传统方法无法在低信噪比下补偿大范围多普勒频移,严重影响通信系统的能力。针对上述问题,本文提出了一种两段式频率捕获算法,该算法包含自动扫频和锁频控制两个阶段。自动扫频阶段通过本振光自动频率扫描将频差缩小至100 MHz量级;锁频控制阶段通过高精度的本振光频率控制与FFT变换,在低信噪比下继续缩小频差至MHz量级。仿真验证结果表明:该算法可在2 dB信噪比下补偿大动态范围的10 GHz范围多普勒频差,满足卫星相干光通信解调需求。
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, authorsList=华莹, 李晓亮, 林一, 李英飞)}, authors=[Author(id=1241060187059049304, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=null, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1241060187142935391, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, authorId=1241060187059049304, language=EN, stringName=Ying HUA, firstName=Ying, middleName=null, lastName=HUA, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=Beijing Research Institute of Telemetry, Beijing 100076, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241060187226821476, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, authorId=1241060187059049304, language=CN, stringName=华莹, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=北京遥测技术研究所 北京 100076, bio={"content":"
华莹 1998年生,硕士研究生。
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华莹 1998年生,硕士研究生。
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李晓亮 1979年生,硕士,研究员。
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李晓亮 1979年生,硕士,研究员。
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林一 1984年生,硕士,高级工程师。
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林一 1984年生,硕士,高级工程师。
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李英飞 1986年生,硕士,高级工程师。
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李英飞 1986年生,硕士,高级工程师。
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相干光通信接收系统框图, figureFileSmall=C6l47wvXNiAWNEvVBEZTWQ==, figureFileBig=JrQhSonfm+v+KzfyPMzmXg==, tableContent=null), ArticleFig(id=1241060190783591420, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=EN, label=Fig.2, caption=
The flow chart of two-stage frequency acquisition, figureFileSmall=XsGBW7E6NYVgxH9/r87UkQ==, figureFileBig=NYRm9xg1rBNXs7+u0Qezqg==, tableContent=null), ArticleFig(id=1241060190863282178, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=CN, label=图2, caption=
两段式频率捕获流程图, figureFileSmall=XsGBW7E6NYVgxH9/r87UkQ==, figureFileBig=NYRm9xg1rBNXs7+u0Qezqg==, tableContent=null), ArticleFig(id=1241060190942973959, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=EN, label=Fig.3, caption=
The diagram of FFT frequency estimation, figureFileSmall=8GJWVcNn35ovkipiU7CNJA==, figureFileBig=BBkZKFiA5DTMkNjKN7EzOA==, tableContent=null), ArticleFig(id=1241060191039442957, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=CN, label=图3, caption=
基于FFT的频率检测框图, figureFileSmall=8GJWVcNn35ovkipiU7CNJA==, figureFileBig=BBkZKFiA5DTMkNjKN7EzOA==, tableContent=null), ArticleFig(id=1241060191140106257, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=EN, label=Fig.4, caption=
The influence of bandwidth of band-pass filter on estimation range of frequency offset, figureFileSmall=4IqQ2zMhA4exRfSxHxOJ8g==, figureFileBig=mJXsqnSbPbubRX9bvVTzNA==, tableContent=null), ArticleFig(id=1241060191240769561, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=CN, label=图4, caption=
带通滤波器的带宽对频偏估计范围的影响, figureFileSmall=4IqQ2zMhA4exRfSxHxOJ8g==, figureFileBig=mJXsqnSbPbubRX9bvVTzNA==, tableContent=null), ArticleFig(id=1241060191354015776, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=EN, label=Fig.5, caption=
Spectral peak amplitude of corresponding frequency difference at different Eb/N0, figureFileSmall=RpT41kIU3T1TN7F+XSQRJQ==, figureFileBig=buhV/TEKTIm3RIT3kcW5XA==, tableContent=null), ArticleFig(id=1241060191454679079, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=CN, label=图5, caption=
不同信噪比下相应频差的谱峰值幅度, figureFileSmall=RpT41kIU3T1TN7F+XSQRJQ==, figureFileBig=buhV/TEKTIm3RIT3kcW5XA==, tableContent=null), ArticleFig(id=1241060191530176557, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=EN, label=Fig.6, caption=
Spectral peak amplitude under the influence of two factors, figureFileSmall=a/2wQysrq498M5kRZkzX4g==, figureFileBig=/L3+DBcHp2fiBi74e3LRIg==, tableContent=null), ArticleFig(id=1241060191609868338, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=CN, label=图6, caption=
两种因素影响下的谱峰值幅度, figureFileSmall=a/2wQysrq498M5kRZkzX4g==, figureFileBig=/L3+DBcHp2fiBi74e3LRIg==, tableContent=null), ArticleFig(id=1241060191706337339, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=EN, label=Table 1, caption=
Simulation parameter
, figureFileSmall=null, figureFileBig=null, tableContent=
| 仿真参数 | 取值 |
|---|
| 码率fb | 1.024 Gbps |
| 采样速率fs | 4 GHz |
| 信噪比 | 15 dB |
| 采样点数 | 1 024 |
| 中心频率 | 1 GHz |
), ArticleFig(id=1241060191802806332, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241060182478869178, language=CN, label=表1, caption=
仿真参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 仿真参数 | 取值 |
|---|
| 码率fb | 1.024 Gbps |
| 采样速率fs | 4 GHz |
| 信噪比 | 15 dB |
| 采样点数 | 1 024 |
| 中心频率 | 1 GHz |
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