Jason writes: > I'm attempting to get the AIS receiver code from [1] working.
Me too. Although I bypassed the mysql parts of the problem, and instead have gnuradio receiving from a USRP to jack audio, and then connect that to the standalone AIS decoder gnuais [2]. > I'm pretty sure I have the date and time fields wrong... Unfortunately, > I'm not receiving any messages to test if the DB is correct. > > Any hints? I am not successfully receiving and decoding messages yet either :( But - one hint is that it might help to tune around. My USRP with TV Rx is around 2kHz off. So tuning around has increased the rate at which I see "Frame received OK. 170 bits" output. Alas I also get "CRC Checksum FALSE!!!" a lot, too. Once I do get binary data, I plan to process it with noaadata-py [3] rather than Ruben Undheim's built in decoder. > Also, what antenna did you use? How far from the transmitters? In my case a hardware AIS receiver is hearing only one reporting vessel, as I am not really close to much shipping here. That's making it a little more challenging. I also have yet to decode the sample data file http://funwithelectronics.com/sdr/samples/ais1-250k.cfile.bz2 so perhaps I am not quite filtering and demodulating correctly yet. -Maitland > [1] - http://funwithelectronics.com/sdr/ais.php [2] http://gnuais.sourceforge.net/ [3] http://pypi.python.org/pypi/noaadata-py/ _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
