[time-nuts] Frequency Ensemble

[Michael Wouters]

This project www.openttp.org provides software for post-processing of raw
data for time-transfer from some currently available single frequency
receivers. It provides CGGTTS and RINEX, the latter for use with the
various PPP services. There are some tools in there too for doing eg common
view and all-in-view comparisons. If you want to try it out, the develop
branch in the GitHub repo is the place to start. I'll be talking about it
at IFCS-EFTF.

Cheers
Michael


On Tue, 19 Mar 2019 at 5:08 am, Anders Wallin <anders.e.e.wallin at gmail.com>
wrote:

> If you search for "GNSS time transfer" you will find a lot of papers etc.
> For example these might get you started:
>
> https://www.bipm.org/ws/CCTF/TAI_TRAINING/Allowed/Fundamentals/Training-2012-GNSS-Defraigne.pdf
> https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7909843
>
> I tried to collect some tools for PPP post-processing on github:
> https://github.com/aewallin/ppp-tools
> I am not sure what (open) software exists for common-view analysis...
> PPP uses satellite clock-corrections and orbit-corrections from an IGS
> data-centre. They have "ultra rapid" and "rapid" products (=downloadable
> files) that are available with some days or hours of delay.
> The "final" products can have up to two weeks (?) of delay.
> With a dual-frequency receiver the ionosphere delay can be removed
> ('ionosphere-free L1/L2 linear combination') and my understanding is the
> troposphere-delay (water content) is one of the larger remaining
> uncertainties.
>
> AW
>
>
> On Mon, Mar 18, 2019 at 5:03 PM Rodger via time-nuts <
> time-nuts at lists.febo.com> wrote:
>
> >
> > Regarding your comments on collecting raw time data from GPS and post
> > processing it.  Can you provide any reference info, links, etc. with more
> > detail on that topic?
> > Clearly I'd need a GPS that outputs the proper raw messaging and the
> > software for processing it.  I'm somewhat familiar with the techniques
> > involved to improve GPS position data, but hadn't thought about it as
> much
> > for timing.
> >
> > Thanks,
> >
> > Rodger
> >
> >
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