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Improvement of the Asia-Pacific TWSTFT network solutions by using DPN results

机译：使用DPN结果改进亚太TWSTFT网络解决方案

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摘要

Two major time and frequency transfer techniques, two-way satellite time and frequency transfer (TWSTFT) and global navigation satellite systems (GNSS: GPS, GALILEO, GLONASS, etc.), are used for the generation of Coordinated Universal Time (UTC)/International Atomic Time (TAI). These time and frequency transfer links comprise a worldwide network and the utilization of the highly redundant time and frequency data is an important topic. Two methods, either TW-only network (i.e., TWSTFT) or singlelink combination of TW and Global Positioning System (GPS), have been developed for combining the redundant data from different techniques. In our previous study, we have proposed a feasible method, utilizing full time-transfer network data, to improve the results of TWSTFT network. The National Institute of Information and Communications Technology (NICT) has recently developed a software-based two-way time-transfer modem using a dual pseudo-random noise (DPN) signal. The first international DPN TWSTFT experiment, using these modems, was performed between NICT (Japan) and Telecommunication Laboratories (TL; Taiwan) and its ability to improve the time transfer precision was demonstrated. In comparison with the conventional NICT-TL TWSTFT link, the DPN time transfer results have higher precision and lower diurnal effects. The estimation also shows that DPN is comparable to GPS precise point positioning (PPP). Because the DPN results show better performance than the conventional TWSTFT results, we would adopt the DPN data for the NICT-TL link and solve the TW+DPN network solutions by using our proposed method. The concept of this application is similar to the so-called multi-technique-network time/ frequency transfer. The encouraging results confirm that the TWSTFT network performance can benefit from DPN data by improving short-term stabilities and reducing diurnal effects. The results of TW+PPP network solutions are also illustrated.
机译：两种主要的时间和频率传输技术，即双向卫星时间和频率传输（TWSTFT）和全球导航卫星系统（GNSS：GPS，GALILEO，GLONASS等），用于产生协调世界时（UTC）/国际原子时间（TAI）。这些时间和频率传输链路包括一个全球网络，高度冗余的时间和频率数据的利用是一个重要的主题。已经开发出两种方法，即纯TW网络（即，TWSTFT）或TW与全球定位系统（GPS）的单链路组合，以组合来自不同技术的冗余数据。在我们以前的研究中，我们提出了一种可行的方法，利用完整的时间传输网络数据来改善TWSTFT网络的结果。美国国家信息和通信技术学院（NICT）最近开发了一种使用双伪随机噪声（DPN）信号的基于软件的双向时间传输调制解调器。 NICT（日本）和电讯实验室（TL；台湾）之间进行了使用这些调制解调器的第一个国际DPN TWSTFT实验，并证明了其提高时移精度的能力。与传统的NICT-TL TWSTFT链接相比，DPN时间传输结果具有更高的精度和更低的昼夜影响。估算还表明，DPN可与GPS精确点定位（PPP）相提并论。由于DPN结果显示出比常规TWSTFT结果更好的性能，因此我们将DICT数据用于NICT-TL链路，并使用我们提出的方法解决TW + DPN网络解决方案。该应用的概念类似于所谓的多技术网络时间/频率传输。令人鼓舞的结果证实，TWSTFT网络性能可以通过改善短期稳定性和减少昼夜影响而从DPN数据中受益。还说明了TW + PPP网络解决方案的结果。

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