So when can I have an app that turns on SA for the answers from my phone? ;)

On Wed, 27 Sep 2017 11:54:11 +0000
Mark Sims holrum@hotmail.com wrote:

Sadly, the IEEE Spectrum article, which they reference, is so full
of mistakes. One would think that the largest electrical engineering
association would have someone to proof read what they publish.
<insert here rant about how the IEEE became an extremely top-heavy bureaucracy
run by USian lawyers instead of engineers, in the last 10-15 years>

		Attila Kinali

--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson

On Wed, September 27, 2017 9:38 pm, Bill Hawkins wrote:

I doubt that knowing which side of the parking lot you are in will be of
much interest to advertisers.  It will help navigation apps with things
like determining whether you are on the access road or already on the
highway, or which of two parallel roads you are on.

In a timing context, I would hope that having a more consistent solution
to the position/time equation would reduce the PPS jitter.  It would be
really nice to see one of these low power, high precision receiver devices
used in a Thunderbolt style design that locks the chipset clock to the
derived clock to avoid hanging bridges to see if the 10x better precision
in location solution could result in 10x lower PPS jitter.

--
Chris Caudle

Any word on whether iOS will support raw observables, as Android has for a
little while now?  I gather the APIs need to support continuous tracking
better so that phase observables are meaningful across epochs.

Will the phones put back the headphone jack, not for audio but instead
repurposed for PPS?  :-)

Cheers,
Peter

On Thu, 28 Sep 2017 10:30:24 -0500
"Chris Caudle" chris@chriscaudle.org wrote:

These chipsets are not designed to be used that way. They are ment
to have a fixed oscillator and will produce a PPS.

But hanging bridges is only an issue if you use the raw PPS pulse and do
not include sawtooth correction in your circuit. Any GPSDO worth its
salt will correct for sawtooth before using the timing of the PPS pulse
in its calculations.

There is one notable exception though: Brook Shera's GPSDO uses the spread
due to sawtooth to "enhance" resolution of the counter. Of course, that
makes it susceptible to hanging bridges. It still works very ok, especially
considering that, together with James Miller's GPSDO, it's the most simple
design out there.

			Attila Kinali

--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson