[time-nuts] U-blox teaser

[Lux, Jim]

On 2/26/21 4:00 PM, John Ackermann N8UR wrote:
> They're claiming "even better than" 5 ns for relative time, which 
> given the 4 ns jitter seems at least sort-of reasonable.  But until 
> someone shows me otherwise, I'm still thinking that getting better 
> than 25 ns absolute accuracy is a pretty good day's work.
>
> John
> ----


And if the jitter is uniformly distributed (i.e. 1 clock cycle of some 
sort) - then the sd is 1/sqrt(12) of the extremes, so a "max 
uncertainty" of 5ns, is more like a 1.5 ns 1 sigma.