[time-nuts] Testing frequency using NTP
Mike Monett
XDE-L2G3 at myamail.com
Thu Oct 2 14:02:53 UTC 2008
>Date: Thu, 02 Oct 2008 23:58:55 +1300
>From: Bruce Griffiths
>Subject: Re: [time-nuts] Testing frequency using NTP
[...]
> For precision frequency comparisons NIST divide the frequencies to
> be compared down to about 1Hz and time stamp the resultant signal
> transitions and the leading edge of the PPS output of a GPS timing
> receiver with a resolution of a few picosec.
> The resultant timestamps are then processed (along with
> measurements taken with a similar system that time stamps the
> transitions of a 1Hz signal derived from one or more of their
> frequency standards) to derive the frequencies of the various
> sources.
> Bruce
Hello Bruce,
This is my first attempt to post so I'm not sure if it will work.
I have been researching the forum archive and find it is by far the
best resource on time and frequency available anywhere. Also, your
posts are extremely helpful to a newcomer. Thanks!
I am curious about the NIST GPS timing receiver that has a
resolution of a few ps. It doesn't seem possible to get that kind of
precision with conventional GPS methods that produce a 1pps signal.
Can you describe more how this is done, and do you have any web
links that give more information?
Thanks,
Mike Monett
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