David,
Thanks for the update. The spikes I'm experiencing coincides with the
time when there are 3 or less visible satellites, as predicted by the
Trimble Planning software.
=
I'm glad that's resolved, Gabs. I have seen similar spikes on my system
David,
Thanks for the update. The spikes I'm experiencing coincides with the
time when there are 3 or less visible satellites, as predicted by the
Trimble Planning software.
On Mon, Jan 7, 2013 at 8:02 PM, David J Taylor
wrote:
> From: Gabs Ricalde
> []
> Non-timing receivers could be unsuitable
From: Gabs Ricalde
[]
Non-timing receivers could be unsuitable for your requirements, as
some of us have discovered:
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html#oscillations
[]
===
Gabs,
The oscillations I reported are not due to the use of a navigation GPS
receiver.
From: Gabs Ricalde
[]
Non-timing receivers could be unsuitable for your requirements, as
some of us have discovered:
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html#oscillations
[]
===
Gabs,
The oscillations I reported are not due to the use of a navigation GPS
receiver.
Some tests of timing receivers' PPS:
ftp://tycho.usno.navy.mil/pub/gps/Furuno/
http://www.cnssys.com/files/PTTI/PTTI_2002_CNS_Testbed.pdf (Motorola M12M)
http://www.cnssys.com/files/PTTI/Low_cost_GPS-based_time_and_frequency_products.pdf
(u-blox LEA-6T)
Non-timing receivers could be unsuitable for
On Fri, 28 Dec 2012 14:49:39 -0500
Dan Kemppainen wrote:
> 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 thinki
Dan,
Good place to ask indeed!
First, the spec is usually done in 1-sigma (rms) meaning about 68% of the
pulses will be better than that. Nothing is usually specified about the
remaining 32% of the pulses, so they could be 200ns apart, and still meet spec.
Its all a question of statistics.
Se
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 Kemppa
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
