Things have changed quite a bit in the GPS world lately. u-blox makes a
number of timing receivers that get to as good as +/-4 nanosecond RMS
jitter (the ZED-F9T). Even the cheaper units are in the <10 ns jitter
range. So as a practical matter, the GPS PPS noise is a lot less than
the
On Mon, Oct 19, 2020 at 09:49:36AM +0200, Miroslav Lichvar wrote:
> On Thu, Oct 15, 2020 at 07:52:06AM +0200, Juergen Perlinger wrote:
> > Another thing that gets into the way are the energy saving strategies
> > modern CPUs employ, like reducing the clock speed and distribute load
> > over cores.
Hello:
The original question was what realistic performance can one
expect from GPS PPS. Based on some reading I did over the weekend here is a
definitive answer:
The 2001 SPS (standard, civilian signal, GPS in the United
States) timing standard was 40 ns with
On Thu, Oct 15, 2020 at 07:52:06AM +0200, Juergen Perlinger wrote:
> Another thing that gets into the way are the energy saving strategies
> modern CPUs employ, like reducing the clock speed and distribute load
> over cores. So unless you nail down the IRQ to a certain core and
> prevent cores
