Hello Luiz, (Did we meet at IFCS-EFTF in Orlando? If so, my apologies for not remembering your name, and for repeating here what you know). I presented some preliminary time-transfer data for the F9P at IFCS and wrote a short paper for the proceedings; if you’d like a copy, I am happy to send you one.
For any other time-nuts interested in post processed GNSS time -transfer: Since the conference, I have been working on and off on adding dual frequency support to OpenTTP ( www.openttp.org), principally for the F9P/T and have four F9P receivers under test. The aim is to have a nice long data set for EFTF next year. Cheers Michael On Sat, 6 Jul 2019 at 2:02 pm, Luiz Paulo Damaceno < [email protected]> wrote: > Hey Graham, > > I'm gonna start a project soon to evaluate a F9P as a Time Transfer GNSS > receiver. For now i haven't too much answers for you but only i know is: > the BIPM uses all labs that participate from UTC to make corrections of > GNSS satellites frequency, also for the TAI use. I think GNNS T&F is a good > and reliable source for many projects. Here in my lab with Septentrio's > Pola RX 3 Tr we have a very low Time Dilution Of Precision when the Glonass > and all anothers becomes enabled, so our frequency if compared to all GNSS > constallations is good, i think the same logic can be applied for frequency > generation / distribution. What i want to say is: with more satellites of > different constellations you can have a better end signal (more stable and > reliable). Tests should be done. I hope can help more in the future. > > Best regards, > > Luiz > > Em sex, 5 de jul de 2019 às 23:00, Graham / KE9H <[email protected]> > escreveu: > > > I have several questions for the group, since there are several members > > that have been able to start evaluating the uBlox F9P and perhaps the F9T > > GNSS receivers. > > > > For the purposes of time and frequency determination, is there an > advantage > > to using the GNSS receivers, relative to just the US GPS? > > > > It appears that a really good GPS (only) based GPSDO can get into the > 1e-11 > > and perhaps the 1e-12 accuracy range. > > > > Does using the signals from GPS (USA), plus GLONASS (Russia), plus Beidou > > (China), and plus Galileo (Europe), actually provide any improvement in > > time/frequency accuracy? > > > > Is that what the F9P actually does, or only some sub-combinations of the > > above? > > > > Down at that level of accuracy, do the four systems agree within 1 e-12, > > anyway? > > > > Is there any advantage to using the GNSS for time/frequency? > > > > Does using the RTCM Corrections, needed to achieve the ~ 1 cm positioning > > accuracy also improve time/frequency accuracy? > > > > The underlying question I am trying to get at is: Will a GNSS based GPSDO > > have any advantage over a GPS-only, or a dual band L1/L2 GPS-only GPSDO? > > > > Thanks, > > --- Graham > > > > == > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
