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lysmarine / lysmarine_gen

Lysmarine is build with the stability of the raspbian operating system to provide an easy to use, stable, low-cost navigation computer for boats.
http://lysmarineos.com
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Add NavTex and Inmarsat Fleet decoder apps #91

Open mgrouch opened 4 years ago

mgrouch commented 4 years ago

Add NavTex and Inmarsat Fleet decoder apps

FredericGuilbault commented 4 years ago

I would def accept pull request about those apps.

mgrouch commented 3 years ago

Well it boils down to proper antenna and proper SDR. Cheap SDRs do not support the bands needed to NavTex and (might) work with upconverters which drives the cost of the whole solution up anyway. Then those bands antennas to be practical and small enough on a boat need to be active antennas, properly grounded. The one I've seen was The PA0RDT Mini Whip http://dl1dbc.net/SAQ/miniwhip.html

mgrouch commented 3 years ago

SDR is very fast developing area. It looks like all human (and possibly alien :) ) RF traffic can be analyzed by software and rpi4 is enough for computing power. Antennas and details of the set up reducing interference are important, SDR band range too (but that is something which drops in price rapidly). Software decoders for all radio transmissions exist already in one shape of from (almost all are free). Transmitting is another story, but receiving and decoding gets easier and cheaper really fast. Many transmissions are decoded by analyzing audio stream from from radio receiver which is fed in decoder app for that particular protocol on raspberry pi. Issue is raspberry pi doesn't have mic input. So you need additional USB audio stick to support. SDR radios can do it bypassing physical audio. They just feed same stream of bites via TCP (ala pulse audio). That's why I'm including a lot of SDR and RF decoders into the distro. I'm not pro in those but I think people will find it very useful.

FredericGuilbault commented 3 years ago

Im already sold to the idea, all I need is a a pull request with the documentation that come with it :smiley_cat:

cuz on priority list, there is no chance I reach this issue before 2027

mgrouch commented 3 years ago

NavTex decoding app added in my fork