[time-nuts] Do GPS augmentation services improve 1pps?

[Bob kb8tq]

Hi

I have never seen any manufacturer recommend SBAS for improved timing. The 
simple answer seems to be that the reference system does not have time sources
in it and that the software that generates the corrections does not consider time to 
be important. 

SBAS (or WAAS or whatever) will improve your location estimate. In the survey in
part of the process things might go a little better. My guess is that pretty much everybody
*assumes* you already have a well known location for your timing device. 

Even when it comes to location, the correction services are a bit wonky. The uBlox
F9P (navigation / survey) device does not run SBAS. Their claim is that things work 
better (for location) without it….. yikes ….

Bob

> On Apr 14, 2019, at 9:55 PM, Skip Withrow <skip.withrow at gmail.com> wrote:
> 
> I'm wondering if GPS augmentation services improve a receiver's 1pps
> output?  My specific interest is with the Novatel OEM6 series of
> receivers (but this issue is applicable to other receiver types as
> well).  With this receiver an external 10MHz oscillator can be steered
> by the GPS receiver, so there is no sawtooth correction.  But there
> are also capabilities to enable WASS corrections, and even the
> TerraStar PPP positioning service that will give centimeter
> positioning accuracy (with subscription $$$).  The question is, are
> these corrections just applied to the position solution or are they
> incorporated into the 1pps solution  somehow as well?
> 
> If someone has some enlightenment it would be appreciated.
> 
> Thanks in advance,
> Skip Withrow
> 
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