[time-nuts] Is possible precise 1pps?
SAIDJACK at aol.com
SAIDJACK at aol.com
Wed Mar 13 17:43:21 UTC 2013
Hi there,
there can be a huge difference in performance, depending on how well the
antenna is positioned. We did a test here a little while ago to see what
happens to our uBlox receivers if they only see a sliver of the sky (the
equivalent of only about 20 minutes worth of sunshine through a window). We ran
them in mobile mode, and then switched to position-hold mode.
The results are remarkable, see the attached plots.
Most of the time these units only see and track one or two satellites. With
position hold mode (right part of the plots), they work great. Without it
(first part of the plots) they are very noisy as the work mostly from
multipath signals.
I had posted these plots here previously and was criticized for doing so,
because I did not make it clear that these plots show the actual GPS
receiver performance, and the performance has nothing to do with the GPSDO's they
are part of. Hopefully this clarifies the significance of these test
results.
bye,
Said
In a message dated 3/13/2013 07:03:16 Pacific Daylight Time, lists at rtty.us
writes:
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of hutta.j at seznam.cz
Sent: Wednesday, March 13, 2013 9:04 AM
To: time-nuts at febo.com
Subject: [time-nuts] Is possible precise 1pps?
I have GPS without "position hold", I wonder how precise 1PPS, which I
want
to use for disciplined OCXO.
You do not know how GPS with "position hold" calculates the measured
coordinates vs know the real coordinates of the expected error timestamps 1
pps?
Thansk for information
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