[Discuss-gnuradio] Recording scarce AIS bursts

[Christian Gagneraud]

Hi list,

The problem with AIS is that if you are not in a busy place you might 
have to wait for few seconds up to few minutes before a new message 
comes in. Which is a bit annoying when you are doing live experimentations.

I was thinking about recording only the raw message bursts, but i would 
need a way to trigger the recorder such as to cut-off the blanks in 
between the messages, but i didn't find yet a solution to achieve that.
Would anyone have some tips to share on how to do that?

Another solution would be to record hours of data, and then apply the 
same principle but off-line using a python script.

My triggering decision would be based on the signal level difference at 
the carrier frequency and "outside enough" the carrier frequency.

Or maybe would anyone on that list have some "chatty" AIS data files to 
share?

Chris

--
Christian Gagneraud,
Embedded systems engineer.
Techworks Marine
1 Harbour road
Dun Laoghaire
Co. Dublin
Ireland
Tel: + 353 (0) 1 236 5990
Web: http://www.techworks.ie/