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
>
>
>

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