[time-nuts] Choosing a GPS IC for carrier phase measurements

Nicolas Braud-Santoni nicolas at braud-santoni.eu
Thu Aug 16 11:45:30 EDT 2018


I've been working on a self-designed GPSDO (on and off for the last couple
of years now), and while I got it working decently well, I've been thinking
about using GPS carrier phase measurements for better accuracy.

The main issue I'm running into is that most timing GPS modules will
happily give you carrier phase measurements... for their internal
oscillator, and the few ICs I can find that would possibly do the job, like
ublox's UBX-M8030-KT-FT, do not have publicly-available datasheets & docs.
(I tried contacting ublox to ask, and never got an answer...)

So, what are people around here using for that purpose?  Bonus points if the
chip can work with a differential-signal clock.  :)



PS: I asked about GPSDO design a few years ago, and life happened shortly
    afterwards; I don't think I ever got around to thanking everyone who
    shared their experiences and insights, though it did get me started,
    some months later, on designing my own GPSDO; so, thanks y'all.  :)
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