[time-nuts] Synchronization

[Bob kb8tq]

Hi

Welcome !!!!!

The answer to any good question will always be “that depends” :)

First depends is what sort of module:

Just about any GPS that is doing a reasonable job will sync to under 50 ns. 
That’s without correcting for sawtooth error. The sync would be device to
device over a local area. 

Sawtooth error results from the way the PPS output is generated. Some
receivers report this information. Units that do this should get you into the
under 10 ns range. 

If you move up to L1/L2 devices, manufacturers seem to claim 5 ns sort of 
sync numbers. 

This is all in an “open loop” mode. If you are willing to post correct the timing, 
you can do much better. Fractions of a nanosecond should be possible with L1/L2.
With L1 only sub 5 ns sort of numbers should be doable.

Part of the “depends” is that the ionosphere is behaving its self. Another part is that
all of the devices have a good sky view. Next up is that they all have an accurate 
position to work against. The list can go on and on from there …..

Lots of fun !!!

Bob

> On Dec 2, 2019, at 3:01 AM, Anton Strydom <agstrydom at gmail.com> wrote:
> 
> Good day All
> 
> I am new here.
> 
> I have been busy with GPS systems for the last couple of years and have
> also developed a number of low cost high accuracy L1 units.
> 
> I also play around with photography and especially in the field of
> photogrammetry and 3D point cloud situations.
> 
> Time being the one thing that influences everything to do with accuracy.
> 
> My question is what good synchronization of a gps clock in Nano seconds?
> 
> Obviously the closer to 0 the better I would guess.
> 
> Thank you in advance
> 
> Yours sincerely
> 
> Anton Strydom
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