>For our timing niche, SDGPS (Software-Defined GPS) doesn't even need to be >real-time. It's the after-the-fact corrections to the LO that are of interest.
Can you elaborate the "after-the-fact corrections to the LO" point? I understand that: I can correct the LO after a sample cycle, then use the corrected LO to take other samples and correct again and so on. On Wed, Sep 4, 2013 at 11:05 PM, Tom Van Baak <t...@leapsecond.com> wrote: > Hi John, > > It's not off-topic at all. Thanks for posting. Someday it would be cool if an > amateur precise time project emerged from this effort. > > What is not clear from your link is the accuracy or stability of the LO that > was used. It seems to me, for timing purposes, that one would want to have a > very precise timebase for the binary samples that are collected. > > I suppose it depends if someone just wants to make a homebrew (50 baud) GPS > subcode decoder and navigation receiver, or if someone is interested in > extracting as much precise time from the code and carrier phase as possible. > For our timing niche, SDGPS (Software-Defined GPS) doesn't even need to be > real-time. It's the after-the-fact corrections to the LO that are of interest. > > Do keep us posted. > > /tvb > > ----- Original Message ----- > From: "John Seamons" <j...@jks.com> > To: "Discussion of precise time and frequency measurement" > <time-nuts@febo.com> > Sent: Tuesday, September 03, 2013 1:30 PM > Subject: [time-nuts] Raw GPS signal samples > > >> Somewhat off-topic but it might help someone out: I've had a tough time >> finding, and using, files on the net containing raw GPS signal samples to be >> used with the various software-only (or software-mostly) GPS receivers out >> there. I finally got a file of data that works and have have posted it plus >> a description of the file format here: <http://www.jks.com/gps/gps.html> >> I've used it successfully with Andrew Holme's excellent homemade GPS >> receiver. Now on to building an actual RF front-end to get some real >> signals.. >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
