北斗三号多频点双频组合共视时间传递性能分析
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1.中国科学院国家授时中心西安710600;2.中国科学院时间频率基准重点实验室西安710600;3.中国科学院大学天文与空间科学学院北京100049)

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国家自然科学基金项目(11703030)资助


Analysis on Dual-frequency Combination Common View Time Transfer Performance Based on BeiDou-3 Multi-frequencies
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1. National Time Service Center, Chinese Academy of Sciences, Xián 710600;2. Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xián 710600;3. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049;

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    摘要:

    针对北斗二号(BeiDou-2) B1I&B2I标准双频无电离层伪距组合解算的共视比对结果中存在明显的噪声进而影响其短期稳定性的现象, 开展了在BeiDou-2和北斗三号(BeiDou-3)现有可用频率信号中选取最优双频组合的研究, 以期改善BeiDou的共视时间传递性能. 基于开发的CGGTTS (Common GNSS (Global Navigation Satellite System) Generic Time Transfer Standard)软件所生成的标准共视文件, 完成了中国科学院国家授时中心(NTSC)与捷克光电研究院(TP)之间GPS、Galileo、BeiDou-2 B1I&B2I及B1I&B3I和BeiDou-3 B1I&B3I及B1C&B2a双频无电离层伪距组合共视时间比对试验, 并用Vondark滤波对各双频组合的共视结果降噪处理, 通过计算滤波残差的RMS值来评估共视时间比对的精度. 结果表明, 利用BeiDou-3 B1C&B2a组合伪距值获得的共视时间比对结果噪声相对较小, 相比BeiDou-2 B1I&B2I、B1I&B3I和BeiDou-3 B1I&B3I组合的RMS (Root Mean Square)值分别提高约46%、52%和37%, 与GPS P1&P2组合的精度相当, 且与Galileo E1&E5a组合相差不大. BeiDou-3 B1C&B2a组合链路的短稳(< 1d)要优于BeiDou-2 B1I&B2I、B1I&B3I和BeiDou-3 B1I&B3I组合, 且与GPS P1&P2、Galileo E1&E5a组合的稳定性相当; 6条共视时间比对链路的中长稳(> 1d)基本一致.

    Abstract:

    In view of the phenomenon that there is obvious noise in the results of the common view time comparison calculated by the standard dual-frequency ionospheric-free pseudorange combination of BeiDou-2 B1I&B2I, which affects its short-term stability, the research on selecting the optimal dual-frequency combination from the available frequency signals of BeiDou-2 and BeiDou-3 is carried out in order to improve the performance of BeiDou common view time comparison. Based on the standard common view files generated by CGGTTS (Common GNSS Generic Time Transfer Standard) software, the common view time comparison test of GPS, Galileo, BeiDou-2 B1I&B2I, B1I&B3I and BeiDou-3 B1I&B3I, B1C&B2a dual-frequency ionospheric-free pseudorange combination between the National Time Service Center, Chinese Academy of Sciences (NTSC) and Institute of Photonics and Electronics, Czech Academy of Sciences (TP) has been completed, and the common view results of each dual-frequency combination are denoised with Vondark filtering, and the precision of common view time comparison is evaluated by calculating the RMS (Root Mean Square) of the filter residual. The results show that the noise of the common view time comparison calculated by the pseudorange of BeiDou-3 B1C&B2a combination is relatively small, and the RMS of the filter residual is about 46%, 52%, and 37% higher than that of BeiDou-2 B1I&B2I, B1I&B3I, and BeiDou-3 B1I&B3I combinations, respectively, which is equivalent to GPS P1&P2 combination, and close to Galileo E1&E5a combination. The short-term stability (< 1 d) of BeiDou-3 B1C&B2a comparison link is better than that of BeiDou-2 B1I&B2I, B1I&B3I, and BeiDou-3 B1I&B3I, and is equivalent to the stability of GPS P1&P2 and Galileo E1&E5a. The medium and long-term stability (> 1 d) of six common view time comparison links tends to be consistent.

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郭栋,董绍武,武文俊,王威雄,张健.北斗三号多频点双频组合共视时间传递性能分析[J].天文学报,2020,(6):78-89.

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  • 收稿日期:2020-04-25
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  • 在线发布日期: 2020-12-04
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