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Re: [gpsd-dev] A detail in your ntpoffset script

From: Dave Platt
Subject: Re: [gpsd-dev] A detail in your ntpoffset script
Date: Wed, 23 Oct 2013 13:09:06 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0

> I see where you are going.  But I have gottent tow PPS to agree to
> better than 1 uSec so I do not think it is a measurement error on
> my part.
> The error is attached to the GPS, not to the port or host I conenct
> it to.  So it is a characteristic of the GPS, not the measurement 
> techniwue.

It would be interesting to measure the electrical offset by a separate
technique which is completely independent of the host interface

If both GPS systems have explicit PPS outputs, using a dual-trace
digital storage 'scope whose trigger is tied to one of the two
PPS edges would give a very good look at the actual timing.

Won't work with USB-output-only GPS'es, of course.

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