I am also unable to understand what you aim (or problem) is but if it can be of any use to you, a small movie of 24 hour of GRAVES radar recording is available at http://jmfriedt.free.fr/1707_graves_36h.ogg Horizontal axis is Doppler shift in Hz (df=2*v/c*143.05 MHz, or a velocity of 750 km/h for a 200 Hz Doppler shift, consistent will plane velocity): all the horizontal lines are nearby planes. I do not have the sensitivity for detecting satellites. If it can be of any help, since I struggled initially to figure out how to save spectra for post-processing (as opposed to the raw signals which would have taken too much disk space), my gnuradio flowchart is at http://jmfriedt.sequanux.org/170828_grc.png (the trick was to use to stream to vector, which I had not investigated prior to this project, and inform the filesink of the vector length at the output of the FFT).
JM > Ok like the primary radar I have spent 7 years working on > > How do I pull out doppler shifted signal from a waterfall spectrum > > The doppler shift is slow though > > Not a chirp but a slow 5 minute chirp > > Andrew > > > > Sent from my iPhone > > > On 23 Aug 2017, at 8:05 pm, Marcus Müller <muel...@kit.edu> wrote: > > > > So, adapt the scale with which you look at things. > > > > I think your question could actually use a lot of "describe the problem > > that you're actually having". > > > > The point is that you don't really seem to understand how you'd "pull the > > doppler signals" out of a combination of signals. Now, we all love to help > > each other, but with this, I'm really stuck with "I don't know what Andrew > > needs help with". My gut feeling is that you haven't got a firm grip on > > what Doppler estimation really is, or how you can do it: > >> I guess this would require some sort of processing ? > > GNU Radio can help you /implement/ that, but at least the basic principles > > are universal. I'd have done very much the same as Chris: point you to > > references, which will allow you to recognize the math behind Doppler > > estimation from actual implementation. > > Best regards, > > > > Marcus > >> On 08/23/2017 07:42 AM, Andrew Rich wrote: > >> Sorry you misunderstood my question > >> > >> I want the doppler shift of the satellites to be very distinct from the > >> station with no doppler shift > >> > >> Much like doppler shift radar perhaps > >> > >> But the change in frequency can be minutes long for the satellite pass > >> > >> Andrew > >> > >> > >> > >>> On 23 Aug 2017, at 3:26 pm, Chris Kuethe <chris.kue...@gmail.com> wrote: > >>> > >>> https://github.com/wnagele/gr-gpredict-doppler > >>> https://github.com/daniestevez/doppler > >>> > >>> might be helpful or at least inspirational. > >>> > >>>> On Tue, Aug 22, 2017 at 9:58 PM, Andrew Rich <vk4...@tech-software.net> > >>>> wrote: > >>>> Sorry this is new to me > >>>> > >>>> I have just worked out I can see satellites in a waterfall display due > >>>> to their doppler shift > >>>> > >>>> I think that lends itself to meteor shower > >>>> > >>>> Can gnu radio be used to assist pulling out the > >>>> doppler signals from the non doppler ones ? > >>>> > >>>> I guess this would require some sort of processing ? > >>>> > >>>> Andrew > >>>> > >>>> Sent from my iPhone > >>>> > >>>> _______________________________________________ > >>>> Discuss-gnuradio mailing list > >>>> Discuss-gnuradio@gnu.org > >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >>> > >>> > >>> > >>> -- > >>> GDB has a 'break' feature; why doesn't it have 'fix' too? > >> > >> > >> > >> _______________________________________________ > >> Discuss-gnuradio mailing list > >> Discuss-gnuradio@gnu.org > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, 25000 Besancon, France _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
