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Timekeeping at the US Naval Observatory

机译:在美国海军天文台的计时

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No one can stop time, but time can stop a system. Users need to be aware of the different flavors of time, depending upon their needs. Most systems require that all their components be on common time (synchrony), but they cannot keep them on time unless they are also on a common frequency (syntony). Other systems simply require syntony. The US Naval Observatory (USNO) is the timing reference for GPS. Its master clock (MC) is based upon 72 HP5071 cesium and 17 hydrogen maser frequency standards in three buildings at two sites, and their data are used to generate UTC (USNO). The USNO disseminates and distributes the time not only via GPS, but also with Loran, network time protocol (NTP), and two-way-satellite time transfer (TWSTT). Our emphasis is on robustness through repeated calibration and multiplicity of systems, and we recommend this for our users as well. Further details and explanations of our services can be found on: http://tycho.usno.navy.mil, or by contacting the author directly.
机译:没有人可以停止时间,但时间可以停止一个系统。根据他们的需求,用户需要了解不同的时间的时间。大多数系统要求他们所有的组件都在常见时间(同步),但除非它们也在共同频率(Syntony)上,否则它们无法按时保持时间。其他系统只是要求造环会。美国海军天文台(USNO)是GPS的时序参考。其主时钟(MC)基于两个站点的三个建筑物的72 HP5071铯和17个氢气频率标准,并且它们的数据用于生成UTC(USNO)。 USNO不仅通过GPS传播和分发时间,也可以使用LORAN,网络时间协议(NTP)和双向卫星时间传输(TWSTT)。我们的重点是通过重复校准和多种系统稳健,我们也为用户推荐这一点。我们的服务的进一步详细信息和解释可以找到:http://tycho.usno.navy.mil,或直接联系作者。

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