[ntp:questions] Why does GPS time diverge from system time?
albertson.chris at gmail.com
Sat Apr 14 01:51:17 UTC 2012
On Fri, Apr 13, 2012 at 12:01 PM, Charles Elliott <elliott.ch at verizon.net>wrote:
> ... The
> average offset since the restart from the offsets computed by NTPD and
> output in the loopstats file is -0.054193 (ms), while the stdDev is
> 1.507155. The maximum and minimum offsets are about +5 and -5 ms,
> respectively, while the overwhelming majority of offsets are between +- 3
If you are running Windows with a USB connected GPS, I'd say your
performance is good. Better than some others have reported using that
You said the GPS and system times were monotonically diverging. I don't
see that from the numbers you post. To prove that you'd need to measure
system and GPS times every couple hours for several days. I think the
difference you are seeing is just the expected noise.
Again for Windows and a USB connected GPS +5 and -5 ms is more or less what
you should expect.
Redondo Beach, California
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