[time-nuts] 1 pps Accuracy in two locations

[Magnus Danielson]

Hi,

While being very close geographically, with all the benefits that gives
to common view aspects, I think GPS/GNSS two-way methods will not be
reasonable on their own to achieve precision within handful ps.

Sub-ns takes quite an effort, and the close proximity might help to push
it a little down, but getting it that low I guesstimate as
difficult/impossible. I would say you would need another system for that.

If you can use fiber, have a look at White Rabbit.

Cheers,
Magnus

On 2019-12-04 10:40, 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
>
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