Many AIS enthusiasts use their amateur radio equipment to receive and decode AIS data via sound card. There are many projects like ShipPlotter (http://www.coaa.co.uk/shipplotter.htm) and AISMon (http://groups.yahoo.com/neo/groups/aismon/info) which perform this task.
AISHub team developed a small multiplatform opensource tool for decoding AIS signal via sound card – AISDecoder. AISDecoder streams AIS sentences via UDP and it is quite easy to integrate it with AISDispatcher or other AIS software which listens for incoming UDP AIS data.
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or use precompiled Windows binary (MinGW 4.8.1)
2. Untar and build
tar zxvf aisdecoder-1.0.0.tar.gz cd aisdecoder-1.0.0 mkdir build cd build cmake ../ -DCMAKE_BUILD_TYPE=RELEASE make
NOTE! Windows build is tested with MinGW only!
3. Execute aisdecoder without any parameters to see help messages
Usage: aisdecoder -h hostname -p port -a pulse,alsa,file [-f /path/file.raw] [-l]
-h Destination host or IP address -p Destination UDP port -a Audio driver [pulse,alsa,file] -D ALSA input device. Use '-D list' to see all available system devices. -c Sound channels [stereo,mono,left,right] (default stereo) -f Full path to 48kHz raw audio file -l Log sound levels to console (stderr) -d Log NMEA sentences to console (stderr) -H Display this help
4. Plug in your sound cable and calibrate the sound level by using -l
The optimum level is 50-70%
Decodes AIS data using Pulse Audio driver and streams NMEA to localhost UDP port 12345
./aisdecoder -hlocalhost -p12345 -apulse