[time-nuts] Advantages of GNSS ???

[ew]

Dana
This was in response to Mark Sins " I don't think that I have ever seen what to do  with the sawtooth value
 documented in any receiver documentation"I did this 4 years ago it, is a sawtooth corrected ublox.  First pass. Always do a follow on board but never did any thing with it since there was no interest. We did it part of our GPSDO work but saw no improvement. Sorry my work offends you.I did the same with the Furuno GT and GN-87 without sawtooth since it is only 4 nsec. Ole tested it and we use it with very good results. Again I followed it up with a later design in case there is interest. I will not post the picture of the original one so not to offend you.I will not do a board on the ublox 9 since we are frequency not time nuts and see no need for it. 
Bert Kehren


In a message dated 7/9/2019 12:05:14 AM Eastern Standard Time, k8yumdoober at gmail.com writes:

One what?  I see that it is a Ublox unit, but see no reference to the
interesting
modern units like the 9 series.  Also, I note that the only reference on
the board
to "ant" is on the lower right corner, while what I suppose to be the
actual antenna
connector appears to be an SMA near the upper right corner.

And why does it look like several of the components have been resoldered
or replaced or something?

Dana


On Mon, Jul 8, 2019 at 8:00 PM ew via time-nuts <time-nuts at lists.febo.com>
wrote:

> Well now you can see one
> Bert Kehren
>
>
> In a message dated 7/8/2019 7:02:07 PM Eastern Standard Time,
> holrum at hotmail.com writes:
>
> A big issue with using the sawtooth correction message from a GPS
> receivers is the issue of just what that sawtooth value is related to and
> how to apply it to the measured PPS value / phase.
> I added the ability to Lady Heather to calculate a sawtooth corrected
> "paper clock" by applying the sawtooth correction message value to the PPS
> output measured by an external counter like the TAPR TICC.
>
> There are around a dozen different combinations of sawtooth value and PPS
> measurements...  only one of which minimizes the PPS error.  Do you add or
> subtract the sawtooth value to the PPS measurement?  Do you apply the
> sawtooth value to the previous/current/next PPS measurement?  Do you apply
> the sawtooth correction to the PPS itself or the accumulated phase of the
> PPS?
> I don't think that I have ever seen what to do  with the sawtooth value
> documented in any receiver documentation...  Heather has default receiver
> dependent correction strategies or lets you specify the correction
> strategy to use._______________________________________________time-nuts
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