| Vondrak滤波方法在软件接收机卫星双向时间传递中的应用 |
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| 引用本文： | 王翔,宋会杰,郭栋,武文俊,董绍武.Vondrak滤波方法在软件接收机卫星双向时间传递中的应用[J].天文学报,2022,63(1):4-51. |
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| 作者姓名： | 王翔 宋会杰 郭栋 武文俊 董绍武 |
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| 作者单位： | 中国科学院国家授时中心;中国科学院时间频率基准重点实验室;中国科学院大学天文与空间科学学院 |
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| 基金项目： | 国家自然科学基金项目(11703030);中国科学院“西部青年学者”项目(XAB2017A06)资助。 |
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| 摘 要： | 基于软件接收机的卫星双向时间传递(Two-Way Satellite Time and Frequency Transfer based on Software Defined Receiver, SDR-TWSTFT)链路每秒采集测量数据后通过数学模型将原始数据拟合为300 s一组的观测文件,因此链路的时间传递结果受短期测量噪声和非模型误差的影响,呈现出一定的随机噪声的特征.提出了一种频域幅值分析方法,针对性地确定滤波因子,构造符合需求的低通Vondrak滤波器.通过对中国科学院国家授时中心(National Time Service Center, NTSC)和德国联邦物理技术研究所(Physikalisch-Technische Bundesanstalt, PTB)之间的SDR-TWSTFT链路测量数据的分析发现,该方法对过滤链路平均时间一天内的高频噪声有效,能够提高链路时间传递结果的可信度,同时滤波后链路的短期频率、时间稳定度也有了显著提高.
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| 关 键 词： | 软件接收机 卫星双向时间传递 链路校准 滤波:Vondrak |
| 收稿时间： | 2021/3/10 0:00:00 |
Application of Vondrak Filtering Method in SDR-TWSTFT |
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| WANG Xiang,SONG Hui-jie,GUO Dong,WU Wen-jun,DONG Shao-wu.Application of Vondrak Filtering Method in SDR-TWSTFT[J].Acta Astronomica Sinica,2022,63(1):4-51. |
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| Authors: | WANG Xiang SONG Hui-jie GUO Dong WU Wen-jun DONG Shao-wu |
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| Institution: | (National Time Service Center,Chinese Academy of Sciences,Xi’an 710600;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi’an 710600;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049) |
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| Abstract: | Two-Way Satellite Time and Frequency Transfer based on Software Defined Receiver (SDR-TWSTFT) link collects the measurement data per second, and then the original data is fitted into a set of observation files of 300 seconds by mathematical model. Therefore, the time transmission result of the link is affected by short-term measurement noise and non-modeled error, showing a certain characteristic of random noise. In this paper, a frequency domain amplitude analysis method is proposed to determine the filter factor and construct a low-pass Vondrak filter. Through the analysis of SDR-TWSTFT link measurement data between National Time Service Center (NTSC) of Chinese Academy of Sciences and Physikalisch Technische Bundesanstalt (PTB) of Germany, it is found that this method is effective for filtering the high frequency noise within one day of the average time, and can improve the reliability of the SDR-TWSTFT link time transfer results. At the same time, the short-term frequency and time stability of the link after filtering are also significantly improved. |
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| Keywords: | Software Defined Receiver(SDR) Two-Way Satellite Time and Frequency Transfer(TW-STFT) link calibration filtering: Vondrak |
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