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
