GPS: Primary tool for time transfer
GPS: Primary tool for time transfer
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DOI：
10.1109/5.736348
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发表时间：
1999-01-01
影响因子：
20.6
通讯作者：
Klepczynski, WJ
中科院分区：
文献类型：
--
作者：
Lewandowski, W;Azoubib, J;Klepczynski, WJ
全球定位系统（GPS）不仅是一个导航系统，它还是一个时间传递系统。作为一个时间传递系统，它提供的稳定性非常接近一天内的十分之一到十四分之一（1纳秒/天）。本文在简要介绍了计时术语的基础上，回顾了近几年来GPS在时间分配和时钟同步方面的作用。然后将讨论GPS粗捕获（C/A）码单频单通道（一颗卫星）共视（CV）时间传递。相对于传统的单通道接收器，这种技术将每日观测的数量增加了十倍，并且导致时间和频率传输稳定性提高了约三倍。将讨论的其他重要改进是使用全球定位系统载波相位测量和温度稳定天线。后者减少了全球定位系统时间接收设备的每日和季节性延迟变化。还将报告使用全球轨道导航卫星系统作为全球定位系统时间传递的补充工具的情况。这些改进表明，全球定位系统作为一种时间传递系统，应能在今后几年内在一天内达到十分之一的十五分之一的稳定度（100 ps/天），随后在一天内达到十分之一的十六分之一的稳定度（10 ps/天）。
Global Positioning System (GPS) is not only a navigation system, it is also a time-transfer system. As a time-transfer system it provides stability very close to one part in ten to the fourteenth over one day (1 ns/day). After a brief introduction to timekeeping terms, this paper reviews the role of GPS in time distribution and clock synchronization over the last few years. GPS coarse acquisition (C/A)-code single-frequency single-channel (one satellite) common-view (CV) time transfer will then be discussed Special consideration will be given to recent progress in GPS C/A-code CV time and frequency transfer through the use of "all-in-view" multichannel receivers. This technique increases the number of daily observations by a factor of ten relative to conventional single-channel receivers and results in an improvement in time and frequency transfer stability by a factor of about three. Other important improvements that will be discussed are the use of GPS carrier phase measurements and temperature-stabilized antennas. The latter reduce the daily and seasonal delay variations of GPS time-receiving equipment. The use of GLONASS as a complementary tool to GPS time transfer will also be reported. These improvements indicate that GPS, as a time-transfer system, should provide the capability to reach a stability of one part in ten to the fifteenth over one day (100 ps/day) during the next few years and subsequently reach one part in ten to the sixteenth over one day (10 ps/day).