Microsecond accuracy at multiple sites: is it possible without GPS?
Microsecond accuracy at multiple sites: is it possible without GPS?
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DOI：
10.1109/mim.2012.6314510
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发表时间：
2012-10
影响因子：
2.1
通讯作者：
M. Lombardi
中科院分区：
文献类型：
--
作者：
M. Lombardi
关键基础设施定时系统依赖于GPS时钟，仅仅是因为微秒精度很容易实现与GPS和难以实现没有它。本文讨论了GPS时钟如何满足关键基础设施的定时要求，为什么他们是脆弱的，以及一些潜在的备份策略。很明显，在不依赖GPS时钟的情况下，在数千个地理上分散的地点实现微秒级精度是一个非常具有挑战性的问题。同样清楚的是，解决这个问题符合美国的最佳利益。
Critical infrastructure timing systems rely upon GPS clocks simply because microsecond accuracy is easy to achieve with GPS and difficult to achieve without it. This paper has discussed how GPS clocks meet critical infrastructure timing requirements, why they are vulnerable, and some potential backup strategies. It seems clear that achieving microsecond accuracy at thousands of geographically dispersed sites without relying on GPS clocks is a very challenging problem. It seems equally clear that solving this problem is in the best interest of the United States.