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Re: Timing via serial port

From: O'Connor, Daniel
Subject: Re: Timing via serial port
Date: Wed, 30 Sep 2020 21:38:21 +0930

> On 30 Sep 2020, at 18:28, Hal Murray <> wrote:
> Has anybody tested various GPS devices to see how good the timing via the 
> serial port is?
> Some of the NMEA sentences have sub-second time stamps.  Are any of them 
> useful?
> Has anybody looked at whether the front of the sentence (or burst) has better 
> timing than the end?

I would say it depends how tight your requirements are.
I setup USB serial to a GPS engine and fed NTP with it and it seemed quite good 
- certainly NTP was happy to use it and all the numbers look good.

I imagine it would also depend a lot on your hardware and OS as to what sort of 
jitter you would get.

Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
 -- Andrew Tanenbaum

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