Comparing a GPS time link calibration with an optical fibre self-calibration with 200 ps accuracy
Comparing a GPS time link calibration with an optical fibre self-calibration with 200 ps accuracy
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DOI：
10.1088/0026-1394/52/2/384
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发表时间：
2015-04-01
期刊：
影响因子：
2.4
通讯作者：
Arias, E. F.
中科院分区：
文献类型：
--
作者：
Jiang, Z.;Czubla, A.;Arias, E. F.
波兰已开发出 420 公里的精确双向光纤时间传递 (TWOTT) 基线，标准不确定度为 112 ps。与此同时，BIPM正在进行一个试点项目，将UTC GNSS时间传递校准的不确定性从5 ns降低到约1.5 ns，为此它开发了一个标准校准方案，名为METODE，与集成便携式GNSS校准站相关。 TWOTT和METODE分别代表了世界上最先进的时间传递方法和校准设备。2013年7月，BIPM校准仪和TWOTT自校准光纤收发器并排放置，比较它们的结果。这是首次将可操作的 TWOTT 用于精确时间传递，也是首次使用精确至 200 ps 的技术验证 GNSS 校准方法。由于两个系统完全独立，并且后者比第一个系统精确一个数量级，因此这种比较可以验证 METODE 及其不确定性。它还证实 TWOTT 中的任何偏差最多为 1 ns。
In Poland, an accurate two-way optical fibre time transfer (TWOTT) baseline of 420 km has been developed with a standard uncertainty of 112 ps. Meanwhile, the BIPM has been engaged in a pilot project to reduce the uncertainty of UTC GNSS time transfer calibrations from 5 ns to approximately 1.5 ns, for which it has developed a standard calibration scheme, named METODE, associated with an integrated portable GNSS calibration station. The TWOTT and the METODE respectively represent the world's most advanced time transfer method and calibration facility.In July 2013, the BIPM calibrator and the TWOTT self-calibrated optical fibre transceivers were set up side by side to compare their results. This is the first time that an operational TWOTT has been used in accurate time transfer and the first time that a GNSS calibration method has been validated with a technique accurate to 200 ps. As the two systems are completely independent and the latter is one order of magnitude more accurate than the first, this comparison allowed validation of the METODE and its uncertainty. It also confirmed that any bias in the TWOTT is at most 1 ns.