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In the field of aerospace tracking, telemetry, and command (TT&C) communications, the capability for precise telemetry, telecommand, and data transmission is a critical technology ensuring reliable spacecraft operations. As the complexity of space missions continues to escalate and the TT&C communication environment becomes increasingly demanding, higher requirements are imposed on the reliability of communication links in TT&C systems. Polar codes, as a short-frame burst coding scheme with high reliability, low complexity, and superior coding gain, yet exhibit high sensitivity to carrier frequency offset errors. Addressing the dual high demands for reliability and synchronization accuracy in TT&C systems, this paper proposes a Polar code-aided frequency offset estimation (PCAFOE) algorithm. Compared with the traditional carrier synchronization algorithm, PCAFOE algorithm is demonstrated with higher estimation accuracy, which is able to effectively improve the carrier synchronization performance of TT&C communication systems, and provides effective technical support for next-generation aerospace TT&C systems.
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在航天测控通信领域,精准的遥测、遥控与数据传输能力是保障航天器可靠运行的关键技术。随着航天任务复杂度的不断提升和测控通信环境的日益严苛,测控系统对通信链路的可靠性提出了更高要求。Polar(Polar code,极化码)是一种高可靠、低复杂度、高增益的编码方式,对载波频偏误差高度敏感。针对航天测控通信系统对可靠性和同步精度的双重高需求,本文提出了一种基于Polar码辅助的频偏估计(Polar code-aided frequency offset estimation,PCAFOE)算法模型,并基于均方误差(Mean Square Error,MSE)的估计指标进行了蒙特卡罗仿真和相应分析。与传统的载波同步频偏估计算法相比,PCAFOE算法具有更高的估计精度,能够显著提高测控通信系统的载波同步性能,为新一代航天测控系统提供有效的技术支撑。
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1, address=1.北京宇航系统工程研究所 北京 100076, bio={"content":"
吴佳奕 1996年生,硕士,工程师。
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吴佳奕 1996年生,硕士,工程师。
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1, 2, address=1. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China
2. Communication Research Center, College of Electronics and Information Engineering, Harbin Institute of Technology,Harbin 150001, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1239158374797996987, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, authorId=1239158374638613419, language=CN, stringName=王报华, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1, 2, address=1.北京宇航系统工程研究所 北京 100076
2.哈尔滨工业大学电子与信息工程学院通信技术研究所 哈尔滨 150001, bio={"content":"
王报华 1987年生,博士研究生,高级工程师。
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王报华 1987年生,博士研究生,高级工程师。
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陈克 1994年生,硕士,工程师。
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陈克 1994年生,硕士,工程师。
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王莉敏 1969年生,学士,高级工程师。
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王莉敏 1969年生,学士,高级工程师。
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Transmitter model of aerospace TT&C communication system with BPSK modulation, figureFileSmall=3vbI2UxT0sWxI5OusNgbrQ==, figureFileBig=jDW85PbJjJbLJYz0i5YTTQ==, tableContent=null), ArticleFig(id=1239158378094719032, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=CN, label=图1, caption=
航天测控通信系统的发射端模型, figureFileSmall=3vbI2UxT0sWxI5OusNgbrQ==, figureFileBig=jDW85PbJjJbLJYz0i5YTTQ==, tableContent=null), ArticleFig(id=1239158378304434246, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=EN, label=Fig. 2, caption=
Receiver model of aerospace TT&C communication system with carrier synchronization, figureFileSmall=8bZauJWPRFF8sAesayC1Ng==, figureFileBig=vAg8cM0TGBPZDo/Ay+86tg==, tableContent=null), ArticleFig(id=1239158378371543115, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=CN, label=图2, caption=
具有载波同步的航天测控通信系统的接收端模型, figureFileSmall=8bZauJWPRFF8sAesayC1Ng==, figureFileBig=vAg8cM0TGBPZDo/Ay+86tg==, tableContent=null), ArticleFig(id=1239158378455429199, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=EN, label=Fig. 3, caption=
Flow diagram of the PCAFOE algorithm model, figureFileSmall=q5yJgroHxSmtPVK371ifYA==, figureFileBig=FQ2BhU3gfmbcye/Av1l95A==, tableContent=null), ArticleFig(id=1239158378539315285, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=CN, label=图3, caption=
PCAFOE算法模型流程图, figureFileSmall=q5yJgroHxSmtPVK371ifYA==, figureFileBig=FQ2BhU3gfmbcye/Av1l95A==, tableContent=null), ArticleFig(id=1239158378619007070, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=EN, label=Fig. 4, caption=
Frequency estimation RMSE of PCAFOE algorithm and Fitz algorithm, figureFileSmall=EgNWwmdA94jLa/OsDe65Ug==, figureFileBig=M6lv42ZALgn3jwp8Tkxa5A==, tableContent=null), ArticleFig(id=1239158378715476068, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=CN, label=图4, caption=
PCAFOE算法和Fitz算法的频率估计RMSE曲线, figureFileSmall=EgNWwmdA94jLa/OsDe65Ug==, figureFileBig=M6lv42ZALgn3jwp8Tkxa5A==, tableContent=null), ArticleFig(id=1239158378790973547, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=EN, label=Table 1, caption=
Simulation parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 值/范围 |
|---|
| 调制方式 | BPSK |
| 信道模型 | AWGN |
| Polar码长 | (2 048,1 024) |
| 码率 | 0.5 |
| 译码方式 | BP译码 |
| 符号速率 | 1 200 sps |
| 算法迭代次数 | 收敛到稳定点为止 |
| 归一化初始频偏 | 1.2×10-4 |
| 频偏估计范围 | -2×10-4~2×10-4 |
| Eb/N0范围 | 0~5 dB |
), ArticleFig(id=1239158378883248245, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368103887600, language=CN, label=表1, caption=
仿真参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 值/范围 |
|---|
| 调制方式 | BPSK |
| 信道模型 | AWGN |
| Polar码长 | (2 048,1 024) |
| 码率 | 0.5 |
| 译码方式 | BP译码 |
| 符号速率 | 1 200 sps |
| 算法迭代次数 | 收敛到稳定点为止 |
| 归一化初始频偏 | 1.2×10-4 |
| 频偏估计范围 | -2×10-4~2×10-4 |
| Eb/N0范围 | 0~5 dB |
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