Thanks for the feedback, Andy! I'm back at this now. I've filed a bug on it with my findings so far. Comments welcome.
https://github.com/gnuradio/gnuradio/issues/3678 Nick On Mon, Jun 29, 2020 at 1:06 PM Andy Walls <a...@silverblocksystems.net> wrote: > Hi Nick: > > On Wed, 2020-06-24 at 17:39 -0700, Nick Foster wrote: > > Hi, > > > > I'm finally getting around to doing some more CPM work > > I forgot to mention, my company found the GMSK demoulation technique > found in this paper: > > > https://www.researchgate.net/publication/241629765_Coherent_demodulation_of_AIS-GMSK_signals_in_co-channel_interference > > coupled with the "method 0" CFO correction in this paper: > > > https://www.researchgate.net/publication/290776860_Preprocessing_AIS_Signals_for_Demodulation_in_Co-Channel_Interference > > along with analog RF components in front of an SDR, and precise timing > with a GPSDO w/PPS to aid in looking for preambles, gave us fantastic > results for AIS reception in GNURadio. > > Although it required quite a few custom blocks. > > Anyway, Douglas Nelson seems to have a lot of cool papers available in the > public: > > https://www.researchgate.net/profile/Douglas_Nelson8 > > Regards, > Andy > > > Best, > > Nick > > >
