It also depends on the algorithm you're using for detection. It's unlikely they have sub-sample accuracy.
M On 03/14/2016 08:58 AM, Marcus Müller wrote: > Hi Ernest, > >> Can GRC go Nanoseconds? > GRC is just a frontend to baseband sample processing blocks. So there's > not really an answer to this. If you had a device that would be giving > you 2GS/s, yes, and if you can build an application that estimates the > phase of an incoming signal, then also, maybe: > > well, first of all, you will need to bring your receiver to an exact > time, within whatever "exact" means to you. For USRPs, you might use the > GPSDOs, and further timing refinement tricks (see Johannes Schmitz' talk > at FOSDEM this year). > Then, you'll need to determine a reference phase for your downconverted > signal. Then, basically with the methods of interferometry, you can > determine a sub-sample accurate estimate of the receive signal timing. > > There's not a "ready to use" for your problem, because it depends on > such an enormous number of specifics of your problem (chief amongst > these hardware, accuracy demands, observation time, SNR, modulation of > the CW). If your signal is really just a continuous wave, you'll always > be signal-period ambiguous, unless you have another source of timing > information. > > It might be really worthwhile pointing you to the GNU Radio Guided > Tutorials; you seem to have quite a good idea of what you want to > implement, but your understanding of what GNU Radio does, and doesn't > do, where the boundaries between GRC, GR, a flow graph and the whole SDR > system lie might be lacking a bit behind that: > https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials > > Best regards, > Marcus > > On 03/13/2016 07:50 AM, ERNEST MATEY wrote: >> Hi All, >> >> I am running a signal analysis on GRC. >> I will receive satellite CW signal and I want to know the exact >> accurate time I received the CW signal. I'm expecting the CW signal >> as a sudden burst . >> >> What methods can I use in my GRC. Which blocks or Flow graph can I do >> to achieve this? >> >> I am looking for accuracy in Nanoseconds. >> How can I achieve this? Can GRC go Nanoseconds? >> >> Thank you all GRC experts for helping! >> Ernest >> >> >> >> Sent from my BlackBerry 10 smartphone. >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
