[time-nuts] 1 pps Accuracy in two locations
Taka Kamiya
tkamiya9 at yahoo.com
Wed Dec 4 16:52:40 UTC 2019
Also, at that speed, signal travels 0.3mm per second, assuming zero velocity factor..... Everything will have to be on chip scale to realize that.
---------------------------------------
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
On Wednesday, December 4, 2019, 11:01:12 AM EST, Tom Van Baak <tvb at leapsecond.com> wrote:
Martyn,
> I'm always being asked to provide equipment that can produce two 1
> pps outputs aligned to each other to within a few ps.
They should look at their best 1PPS on a 'scope. You can get ns with
care; I doubt ps is possible. I mean, that's THz BW isn't it?
Can you share with us what their application is?
> So they are asking for two of my GNSS frequency standards with 1 pps
> outputs.
>
> The 1 pps outputs being derived from the rubidium oscillator (which
> is aligned to GPS/GNSS)
>
> The best I think I can achieve is in the low ns range.
Right. It will be ns, not ps. Forget about using GNSS for ps level timing.
> Does anyone know how this can be achieved?
Google for papers by high-end national timing laboratories. Words like:
active temperature stabilized (phase stabilized) bidirectional optical
fiber links.
Very possible, very expensive, quite common now. I'd guess most of the
timing centers in Europe are linked this way.
/tvb
On 12/4/2019 1:40 AM, martyn at ptsyst.com wrote:
> Hello,
>
>
>
> I'm always being asked to provide equipment that can produce two 1 pps
> outputs aligned to each other to within a few ps.
>
>
>
> These two 1 pps pulses are not in the same location and could be 100 metres
> to a few km away.
>
>
>
> So they are asking for two of my GNSS frequency standards with 1 pps
> outputs.
>
>
>
> The 1 pps outputs being derived from the rubidium oscillator (which is
> aligned to GPS/GNSS)
>
>
>
> The best I think I can achieve is in the low ns range.
>
>
>
> Does anyone know how this can be achieved?
>
>
>
> Regards
>
>
>
> Martyn
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>
_______________________________________________
time-nuts mailing list -- time-nuts at lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list