[time-nuts] Re: What time scale does IGS use to report its clock files?

[Bob kb8tq]

Hi

Galileo time and GPS time are linked about as closely as
you can do and still have two independent systems. Glonass 
is synced to the Russian version of UTC (  = UTC(SU) ). Since
that is a component of UTC / BIPM, it does indeed tie in at 
some point. 

Bob

> On Oct 17, 2022, at 5:29 PM, Skip Withrow via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hello time-nuts,
> I have been doing some GPS PPP work (mostly with NrCan) and have a question
> as to what clock scale the IGS clock products are referenced to?
> 
> I would assume that the GPS data is GPS time, which is steered by
> UTC(USNO).  So, clock solutions that I compute should be corrected by the
> difference between USNO and BIPM to get UTC.
> 
> What about other satellite constellations?  I'm sure IGS keeps track of
> them as well.  And I'm sure that Galileo, Glonass, and the rest use
> different time scales.  Do IGS clk files represent the system that they are
> reporting, or is there some translation to a common time scale?
> 
> I tried doing some research and did not come up with anything definitive.
> Any pointers in the correct direction would be appreciated.
> 
> Thanks,
> Skip Withrow
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