Daniele, I have worked on this problem for a specific case as well. I have a document with source code and a short description of what's happening that can be found here ( https://www.dropbox.com/s/bcma7fqa7ip2own/unwrap_example.txt).
Michael On Mon, Jun 16, 2014 at 10:05 AM, Daniele Nicolodi <dani...@grinta.net> wrote: > Hello Matt, > > thank for your answer. I'm aware of the problem and in my application I > can keep phase bounded, but not bounded to (-pi, +pi] therefore I need > unwrapping to make sense of my modulation data. > > If such feature does not exist in GNU radio, I hope it is not too hard > to code it myself. > > Thanks. Cheers, > Daniele > > > On 16/06/2014 15:44, Matt Ettus wrote: > > > > Daniele, > > > > The problem with phase unwrapping is that it is unbounded, and will tend > > to infinity. Once it gets very big, when you try to add a small number > > to a very big number, floating point loses precision. Eventually, > > adding small to extremely big returns the big number unchanged. This > > isn't that useful. > > > > Matt > > > > > > > > On Mon, Jun 16, 2014 at 2:40 PM, Daniele Nicolodi <dani...@grinta.net > > <mailto:dani...@grinta.net>> wrote: > > > > Hello, > > > > I just started to work with GNU radio for my very basic needs, so > please > > excuse my naive questions and probably my inappropriate use of the > > jargon. > > > > My first trivial application of GNU radio is to simply measure the > phase > > of a phase modulated signal with an Ettus Research USRP N210 and a > LFRX > > daughter-board. > > > > Everything works as expected, but I haven't found a way to do phase > > unwrapping (removing the 2pi ambiguity in the phase obtained from the > > arctan function looking at discontinuities in the phase data). Is > this > > functionality offered somewhere, and I missed it, or should I look > into > > implementing it myself? > > > > Thanks. Cheers, > > Daniele > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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