[time-nuts] Timing between two GPS PPS outputs.

Azelio Boriani azelio.boriani at screen.it
Fri Dec 28 20:48:14 UTC 2012

The GPS system was designed to transfer time anywhere in the world (and for
navigation, of course) and so your answer is yes. If the GPS receiver is a
timing grade unit then you can expect under 100nS accuracy (to UTC) and
stability over time of the PPS.

On Fri, Dec 28, 2012 at 8:49 PM, Dan Kemppainen <dan at irtelemetrics.com>wrote:

> Hi all,
> I've been following this list with some interest, and have a question
> about two individual timing GPS units PPS outputs. Let's assume that the
> timing GPS units are identical units, say two SSR-6t's for example.
> If I take these two units and fire them up next to each other off of the
> same antenna one would expect the PPS signals to be very similar to each
> other. If the unit specifies 20nS, I would expect at most, say, 40nS Error
> between the two PPS signals. (Maybe this is not correct, by all means
> discussion is welcome).
> Now, lets say we fire these units up on different antennas at the same
> location. For the purpose of this discussion let's assume the antennas are
> identical or as identical as reasonably possible. (Same make, mode, cable
> length, etc). Will they still be within the specified errors or each other?
> Now, lets say we move them some distance apart say 500meters (or yards if
> you prefer). Do they still maintain the same relative error between them?
> The reason for this question is two fold.  I have a personal project in
> mind where I'd like to time stamp two events within several tens of
> hundreds of nS if possible, over some distance without cabling. Also, as I
> started thinking of this application, I realized my understanding of the
> details of GPS timing is a little weak. I figured this would be a good
> place to ask.
> Thanks,
> Dan
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