What exactly do you mean by clock bias? compared to what? Once the unit is locked to GPS and you use the GPSDO as your system clock, the timing will be under 1PPB. What exactly are you measuring?
If you’re trying fo derive bit timing from a modulated digital signal, the usual way is to use a PLL in your DSP algorithms. Sent from my iPhone > On Jun 4, 2020, at 11:52 AM, Sidd Subramanyam via USRP-users > <[email protected]> wrote: > > > Hi all, > > I was wondering if there was a way to extract or compute a precise Clock Bias > of the USRP time vs GPS time from the GPSDO. I am using a B210 USRP with the > board mounted recommended TCXO GPSDO. I have previously used the GNSS-SDR > (https://gnss-sdr.org/) software to compute pseudorange and clock bias, > however this software is run by using the front end RX channels and not the > GPSDO input. > > In my use case, I have a need to compute this from my built in GPSDO since I > am intending to simultaneously use the front end on S-band signals, and the B > series does not allow 2 separate center frequencies across its 2 RX channels. > > I am aware of the NMEA messages from which I can extract the position lock > via serial but it does not seem like there is a time output that is more > granular than one second which I can use to compute a clock bias. > > Any help is appreciated. > > Thank you, > Sidd > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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