Application of Vondrak Filtering Method to the Two-Way Satellite Time and Frequency Transfer Based on Software Defined Receiver

Q4 Physics and Astronomy

Chinese Astronomy and Astrophysics Pub Date : 2022-04-01 DOI:10.1016/j.chinastron.2022.05.007

WANG Xiang , SONG Hui-jie , GUO Dong , WU Wen-jun , DONG Shao-wu

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引用次数: 2

Abstract

The SDR-TWSTFT (Two-Way Satellite Time and Frequency Transfer based on Software Defined Receiver) link collects measurement data per second and then fits the raw data into 300 seconds by mathematical model. The time transfer results of the link are therefore affected by short-term measurement noise and non-model errors, and exhibit certain characteristics of random noise. A frequency domain amplitude analysis method is proposed to determine the filtering factor and construct a low-pass Vondrak filter to meet the requirements. By analyzing the measured data of the SDR-TWSTFT link between the NTSC (National Time Service Center) of Chinese Academy of Sciences and the PTB (Physikalisch-Technische Bundesanstalt) of Germany, it is found that the method is effective in filtering the high frequency noise in the average time of the link, can improve the confidence of the link time transfer results, and also the short-term frequency and time stability of the filtered link is significantly improved.

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Vondrak滤波方法在基于软件定义接收机的卫星时频双向传输中的应用

SDR-TWSTFT(基于软件定义接收机的双向卫星时频传输)链路每秒采集测量数据，然后通过数学模型将原始数据拟合到300秒内。因此，链路的时间传递结果受到短期测量噪声和非模型误差的影响，并表现出一定的随机噪声特征。提出了一种确定滤波因子的频域幅度分析方法，并构造了一个满足要求的低通冯德拉克滤波器。通过对中国科学院国家时间服务中心(NTSC)与德国物理技术联邦分析中心(PTB)之间的SDR-TWSTFT链路的实测数据进行分析，发现该方法能够有效滤除链路平均时间内的高频噪声，提高链路时间传递结果的可信度，滤波后链路的短期频率和时间稳定性也得到明显改善。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Astronomy and Astrophysics Physics and Astronomy-Astronomy and Astrophysics

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： The vigorous growth of astronomical and astrophysical science in China led to an increase in papers on astrophysics which Acta Astronomica Sinica could no longer absorb. Translations of papers from two new journals the Chinese Journal of Space Science and Acta Astrophysica Sinica are added to the translation of Acta Astronomica Sinica to form the new journal Chinese Astronomy and Astrophysics. Chinese Astronomy and Astrophysics brings English translations of notable articles to astronomers and astrophysicists outside China.