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KAN Haoyu, HU Zhigang, LÜ Yifei, XIE Xin, ZHOU Renyu, ZHAO Qile. Performance Evaluation of BeiDou-3 Spaceborne Atomic Clock Using Different Time Synchronization Systems[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210286
Citation: KAN Haoyu, HU Zhigang, LÜ Yifei, XIE Xin, ZHOU Renyu, ZHAO Qile. Performance Evaluation of BeiDou-3 Spaceborne Atomic Clock Using Different Time Synchronization Systems[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210286

Performance Evaluation of BeiDou-3 Spaceborne Atomic Clock Using Different Time Synchronization Systems

doi: 10.13203/j.whugis20210286
Funds:

The National Natural Science Foundation of China(42030109)

  • Received Date: 2021-06-03
  • Objectives: The performance of the GNSS spaceborne atomic clock affects the entire navigation system, by having direct impact on GNSS measurement quality, ranging precision, clock prediction and satellite autonomous navigation capabilities. Different time Synchronization systems may have different impact on the evaluation of spaceborne atomic clock. Precise clock bias data determined by inter-satellite link (ISL), two-way time transfer (TWTT) and orbit determination and time synchronization (ODTS) system are used to further evaluate the performance of Beidou-3 on-orbit atomic clock. Methods: Quadratic polynomial model and total Allan/Hadamard variance are used to analyze the performance of the Beidou-3 satellite clock data of the three different time synchronization systems. Results: The result shows that the frequency accuracy and frequency drift of the above three clock bias determination systems are consistent. The frequency accuracy of all satellites is within the range of (-4~2)×10-11. Frequency accuracy of hydrogen clock is better than that of rubidium clock. The frequency drift based on the ISL system is slightly better than that of the ODTS; the three clock determination systems have their own advantages in evaluating the stability of the atomic clock, respectively. For short-term stability, the ODTS whose 3000s stability reaches 3×10-14 is better than that of ISL, and hydrogen clock is better than rubidium clock. For medium-term and long-term stability, when the averaging time is greater than 1×104 s, the result of ISL is closer to the actual condition of the Beidou-3 spaceborne clock; for long-term stability more than 7 days, the broadcast ephemeris bias based on TWTT system can be used for rapid evaluation, which result is close to ODTS and ISL. Conclusions: The three clock bias determination systems can be used to evaluate the frequency accuracy and frequency drift of on-orbit atomic clocks with basically consistent statistical results. The three clock bias determination systems have their own advantages in assessing the stability of the orbiting satellite clock when selecting different averaging time.
  • [1] (王宇谱, 李博, 白文乾, 等. 导航卫星钟差预报研究综述; proceedings of the第九届中国卫星导航学术年会, 黑龙江哈尔滨, 2018

    Wang Yupu, Li Bo, Bai Wenqian, et al. A Review of Navigation Satellite Clock Bias Prediction; proceedings of the 9th China Satellite Navigation Conference, Harbin, Heilongjiang, China, F, 2018[C].
    [2] CSNO. Report on the Development of BeiDou Navigation Satellite System (version 2.1)[Z]//OFFICE C S N. Beijing. 2012)
    [3] YANG Y, TANG J, MONTENBRUCK O. Chinese Navigation Satellite Systems[M]//TEUNISSEN P J G, MONTENBRUCK O. Springer Handbook of Global Navigation Satellite Systems. Cham; Springer International Publishing. 2017:273-304.
    [4] WANG W, WANG Y, YU C, et al. Spaceborne atomic clock performance review of BDS-3 MEO satellites[J]. Measurement, 2021, 175.
    [5] XIE X, GENG T, ZHAO Q, et al. Orbit and clock analysis of BDS-3 satellites using inter-satellite link observations[J]. Journal of Geodesy, 2020, 94(7).
    [6] LV Y, GENG T, ZHAO Q, et al. Evaluation of BDS-3 Orbit Determination Strategies Using Ground-Tracking and Inter-Satellite Link Observation[J]. Remote Sensing, 2020, 12(16):2647.
    [7] GUO C, RENYU Z, ZHIGANG H, et al. Statistical characterization of the signal-in-space errors of the BDS:a comparison between BDS-2 and BDS-3[J]. GPS Solutions, 2021, 25(3).
    [8] WU Z, ZHOU S, HU X, et al. Performance of the BDS3 experimental satellite passive hydrogen maser[J]. GPS Solutions, 2018, 22(2):43.
    [9] LV Y, GENG T, ZHAO Q, et al. Characteristics of BeiDou-3 Experimental Satellite Clocks[J]. Remote Sensing, 2018, 10(11).
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Performance Evaluation of BeiDou-3 Spaceborne Atomic Clock Using Different Time Synchronization Systems

doi: 10.13203/j.whugis20210286
Funds:

The National Natural Science Foundation of China(42030109)

Abstract: Objectives: The performance of the GNSS spaceborne atomic clock affects the entire navigation system, by having direct impact on GNSS measurement quality, ranging precision, clock prediction and satellite autonomous navigation capabilities. Different time Synchronization systems may have different impact on the evaluation of spaceborne atomic clock. Precise clock bias data determined by inter-satellite link (ISL), two-way time transfer (TWTT) and orbit determination and time synchronization (ODTS) system are used to further evaluate the performance of Beidou-3 on-orbit atomic clock. Methods: Quadratic polynomial model and total Allan/Hadamard variance are used to analyze the performance of the Beidou-3 satellite clock data of the three different time synchronization systems. Results: The result shows that the frequency accuracy and frequency drift of the above three clock bias determination systems are consistent. The frequency accuracy of all satellites is within the range of (-4~2)×10-11. Frequency accuracy of hydrogen clock is better than that of rubidium clock. The frequency drift based on the ISL system is slightly better than that of the ODTS; the three clock determination systems have their own advantages in evaluating the stability of the atomic clock, respectively. For short-term stability, the ODTS whose 3000s stability reaches 3×10-14 is better than that of ISL, and hydrogen clock is better than rubidium clock. For medium-term and long-term stability, when the averaging time is greater than 1×104 s, the result of ISL is closer to the actual condition of the Beidou-3 spaceborne clock; for long-term stability more than 7 days, the broadcast ephemeris bias based on TWTT system can be used for rapid evaluation, which result is close to ODTS and ISL. Conclusions: The three clock bias determination systems can be used to evaluate the frequency accuracy and frequency drift of on-orbit atomic clocks with basically consistent statistical results. The three clock bias determination systems have their own advantages in assessing the stability of the orbiting satellite clock when selecting different averaging time.

KAN Haoyu, HU Zhigang, LÜ Yifei, XIE Xin, ZHOU Renyu, ZHAO Qile. Performance Evaluation of BeiDou-3 Spaceborne Atomic Clock Using Different Time Synchronization Systems[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210286
Citation: KAN Haoyu, HU Zhigang, LÜ Yifei, XIE Xin, ZHOU Renyu, ZHAO Qile. Performance Evaluation of BeiDou-3 Spaceborne Atomic Clock Using Different Time Synchronization Systems[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210286
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