gnuais 0.1.0 can now be downloaded from SourceForge. It's an AIS decoding program for Linux, licensed under the GPL. Attach it to the 9600-bit/s data capable discriminator output of a VHF FM receiver, tune the rx on the marine VHF channel 87B (161.975 MHz) or 88B (162.025 MHz), and you'll be able to receive position data from nearby vessels.
Version 0.1.0 has an improved DSP decoder (thanks to Tomi Manninen, OH2BNS) and it can also upload AIS data to aprs.fi using the new JSON AIS protocol. If you wish to share your AIS data with aprs.fi, please drop me an email - the address is on the Profile page of this blog.
This is still an alpha quality release, so there are some caveats - the local GUI isn't working, and SoundChannels should be set to both (other settings will probably not work). The installation instructions are not very good either. If you've compiled software on Linux before, set up an igate, and played with soundmodem or gmfsk, installing should be pretty easy. It's an open-source project, so contributions are welcome!
The news of https://aprs.fi/ - new features and interesting attractions found in the APRS and AIS worlds.
Showing posts with label gnuais. Show all posts
Showing posts with label gnuais. Show all posts
Sunday, December 21, 2008
Friday, October 31, 2008
gnuais - AIS decoding on Linux
Lately I've been working on the gnuais source code, improving it so that it could be used to decode AIS and feed aprs.fi using Linux. My changes are in the SVN trunk (not in any released version yet). It's generally working, I just haven't done the actual "feed aprs.fi" part yet. But it's getting closer. The decoder isn't as good as in aismon/shipplotter - if you have DSP coding experience, your help is welcome on this project!
I've also modified some Televa 703-LYVV VHF FM receivers from the cold war era to be used as AIS receivers. "Brand new" (but a bit over 30 years old - like myself) commercial NBFM receivers in their original factory boxes, built to be installed at bomb shelters and such, but (luckily) never needed. Going to install a couple of them here in Helsinki, with directional antennas pointing southeast and southwest on the Gulf of Finland. We installed the antennas and cables during the last couple weeks, they're just waiting for the gnuais feeding code.
I've also modified some Televa 703-LYVV VHF FM receivers from the cold war era to be used as AIS receivers. "Brand new" (but a bit over 30 years old - like myself) commercial NBFM receivers in their original factory boxes, built to be installed at bomb shelters and such, but (luckily) never needed. Going to install a couple of them here in Helsinki, with directional antennas pointing southeast and southwest on the Gulf of Finland. We installed the antennas and cables during the last couple weeks, they're just waiting for the gnuais feeding code.
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