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Atomic clock performance and combined clock error prediction for the new generation of BeiDou navigation satellites

机译：新一代北斗导航卫星的原子钟性能和组合钟误差预测

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摘要

Atomic clocks are the core equipment aboard navigation satellites, and their performances and predictions directly determine PNT accuracy. In this paper, the on-orbit performances and prediction accuracies of atomic clocks used in new generation navigation satellites are evaluated using two-way time synchronization data. First, using clock error data preprocessed based on combined MAD gross error detection, the method used to evaluate satellite clock performance is studied. The results illustrate that gross error can be eliminated effectively and that the performances of the new generation of satellites are improved in comparison with those of regional satellites. The frequency accuracy has been enhanced from 6.91 x 10(-12) to 3.29 x 10(-12), and daily stability has been enhanced from 4.036 x 10(-14) to 2.339 x 10(-14). Second, a weighted combined clock error prediction model was designed that synthesizes polynomial and gray models using the classical weighted method. The results using the combined models show that the prediction accuracies of the new generation satellites are improved by a factor of two when compared with those for regional satellites, and the mean prediction was enhanced was from 0.77 ns to 0.38 ns. Moreover, from the research findings, it was found that prediction accuracy is significantly correlated with daily stability and frequency accuracy and has a micro-correlation with daily drift rate. Finally, in order to study the prediction accuracies of the new generation of satellites, we studied ISL and concluded that it has greatly increased the measured arc of the MEO satellites and can improve re-entry prediction accuracies from 3-4 ns to 1 ns. (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.
机译：原子钟是导航卫星上的核心设备，它们的性能和预测直接决定PNT的准确性。在本文中，使用双向时间同步数据评估了新一代导航卫星中使用的原子钟的在轨性能和预测精度。首先，使用基于组合MAD总体错误检测预处理的时钟误差数据，研究了用于评估卫星时钟性能的方法。结果表明，与区域卫星相比，可以有效消除总误差，并且新一代卫星的性能得到改善。频率精度从6.91 x 10（-12）提高到3.29 x 10（-12），日常稳定性从4.036 x 10（-14）提高到2.339 x 10（-14）。其次，设计了一个加权组合时钟误差预测模型，该模型使用经典加权方法来合成多项式和灰色模型。使用组合模型的结果表明，与区域卫星相比，新一代卫星的预测精度提高了两倍，平均预测范围从0.77 ns提高到0.38 ns。此外，从研究结果中发现，预测精度与日稳定性和频率精度显着相关，并且与日漂移率具有微相关性。最后，为了研究新一代卫星的预测精度，我们研究了ISL，得出的结论是，它极大地增加了MEO卫星的实测弧度，并将重入预测精度从3-4 ns提高到1 ns。 （C）2018年COSPAR。由Elsevier Ltd.出版。保留所有权利。

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  • 来源
    《Advances in space research》 |2019年第9期|2889-2898|共10页
  • 作者

    Wang Dongxia; Guo Rui; Xiao Shenghong; Xin Jie; Tang Tingsong; Yuan Yunbin;

  • 作者单位

    Beijing Satellite Nav Ctr, Beijing 100094, Peoples R China|State Key Lab Geodesy & Earths Dynam, Wuhan 430037, Hubei, Peoples R China;

    Beijing Satellite Nav Ctr, Beijing 100094, Peoples R China|State Key Lab Geodesy & Earths Dynam, Wuhan 430037, Hubei, Peoples R China;

    Beijing Satellite Nav Ctr, Beijing 100094, Peoples R China;

    Beijing Satellite Nav Ctr, Beijing 100094, Peoples R China|State Key Lab Geodesy & Earths Dynam, Wuhan 430037, Hubei, Peoples R China;

    Beijing Satellite Nav Ctr, Beijing 100094, Peoples R China;

    State Key Lab Geodesy & Earths Dynam, Wuhan 430037, Hubei, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    New generation satellites; Clock error prediction; Atomic clock; Performance;

    机译：新一代卫星;时钟误差预测;原子钟;性能;

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