Editing Time and frequency transfer (section)

==One-way==
In a one-way time transfer system, one end transmits its current time over some communication channel to one or more receivers.<ref name="Jones">{{cite book | last=Jones | first=T | title=Splitting the second | publisher=Institute of Physical Publishing | year=2000}}</ref>{{rp|116}} The receivers will, at reception, decode the message, and either just report the time, or adjust a local clock which can provide hold-over time reports in between the reception of messages. The advantage of one-way systems is that they can be technically simple and serve many receivers, as the transmitter is unaware of the receivers.

The principal drawback of the one-way time transfer system is that [[propagation delay]]s of the communication channel remain uncompensated except in some advanced systems. Examples of a one-way time transfer system are the clock on a church or town building and the ringing of their time-indication bells; [[time ball]]s, [[radio clock]] signals such as [[LORAN]], [[DCF77]] and [[time from NPL (MSF)|MSF]]; and finally the [[Global Positioning System]] which uses multiple one-way time transfers from different satellites, with positional information and other advanced means of delay compensations to allow receiver compensation of time and position information in real time.