[time-nuts] uBlox F9T testing - best settings?

[Michael Wouters]

Hello Ragnar

Mktimetx uses the receiver-provided sawtooth correction in the TP message.
The TDEV plots in the presentation I linked show its effectiveness.

Cheers
Michael

On Mon, 23 Sep 2019 at 4:21 pm, Ragnar Sundblad <ragge at kth.se> wrote:

>
> Hello Michael,
>
> > On 22 Sep 2019, at 23:54, Michael Wouters <michaeljwouters at gmail.com>
> wrote:
> >
> > The OpenTTP software mktimetx applies sawtooth corrections to the TIC
> > measurements, as you guessed. The corrected TIC measurements are combined
> > with the raw GNSS pseudo ranges, and then this is what goes into the
> output
> > RINEX and what is used for CGGTTS generation.
>
> Have you considered using the UBX-TIM-TP qErr correction (the receivers own
> estimate of the quantisation error for the TIMEPULSE output) instead of
> sawtooth filtering?
>
> I have played with it a little on a u-blox M8, and it sure seemed to smooth
> things out, but I haven’t made any real measurements on the result.
>
>
> Anders,
> Thanks for sharing your results! I am a but surprised that you have so
> large
> variations, I wonder how much the antenna placement affects the results.
> Just for fun - can you tell us more about how your antenna is place now?
>
>
> Best regards,
>
> Ragnar
>
>
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