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.
