[ntp:hackers] hackers] Intel's Galileo as NTP server?
todd
tglassey at earthlink.net
Sun Oct 6 13:51:06 UTC 2013
Guys - Microsecond calibration in open-loop systems is OK but in systems
running synchronousy and in particular precision controls for sillying
things like by-wire controls and for securities trading need something
more, they need provable synchronization at the nanosecond level.
So that begs the issue on what is possible with the systems today...
Todd
On 10/05/2013 11:49 PM, Hal Murray wrote:
> david-taylor at blueyonder.co.uk said:
>> Using "normal" PCs I'm not convinced that you would see any difference
>> between the slightly more accurate 6T and other GPS modules. We are looking
>> at the microsecond level in PCs (perhaps even greater in ARM boards), but
>> the differences are in the one-tenth microsecond level. Having said that,
>> no I haven't played with the other boxes you mention.
> I think the PPS an ARM based system could be more accurate than a PC.
>
> The trick is that most ARM SOCs have counter/timers that can be used to
> capture the time without the delays of the interrupt processing. The delay
> itself isn't a problem. It's the noise/jitter in the delay. The counter
> avoids that.
>
> I don't know if any code does it that way. If not, it would be an
> interesting experiment.
>
>
>
--
Todd S. Glassey
Personal Disclaimers Apply
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