[time-nuts] u-Blox ZED-F9T block diagram or timing knowledge available here?

[Hal Murray]

Forrest Christian said:
> One thing which it took me a while to wrap my head around is that for
> frequency, sawtooth error generally dissappears for a lot of definitions of
> reasonable accuracy.  You're averaging for such a long period that what seems
> like horrible accuracy is very usable.

Check out hanging bridges. :)


> For instance say your gps 1PPS source is accurate to +-1uS.  Over 1 second
> this is 1e-6.  But over 1000 seconds this is 1e-9.  Over 100000 seconds
> you're at 1e-11.   For a 10MHz clock adjusted using this long of averaging,
> this error is only +-.0001Hz 

That only works if the device you are controlling is stable over that time 
period.


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