Hi I have a 1 PPS from GPS into I channel and then signal in Q channel. I injected 1 PPS into I-Channel of ADC of HackRF one. I am only recording as a text file with a simple file sink flowgrapgh the two channels What should I add, how should I post process.
Ernest On Tue, Mar 15, 2016 at 2:20 AM, Martin Braun <[email protected]> wrote: > 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 >
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