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Re: [Discuss-gnuradio] Recording scarce AIS bursts
From: |
Christian Gagneraud |
Subject: |
Re: [Discuss-gnuradio] Recording scarce AIS bursts |
Date: |
Fri, 27 Jul 2012 19:30:55 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20120601 Thunderbird/13.0 |
On 27/07/12 17:39, John Malsbury wrote:
You may not see optimal performance, but the standard or simple squelch
in GNU Radio may meet these basic needs. I've used it for similar
functionality in other packet radio systems. I'm not sure what the
"carrier on" time is before modulation starts, so I can't promise that
they will work w/ the higher datarate of AIS.
Hi Nick,
It seems to do the job, at least it work for the strong bursts. Now i
think i just need to find the right gain settings to get the weaker ones
pass through.
thanks,
Chris
Nick,
Any thoughts?
-John
On Fri, Jul 27, 2012 at 8:40 AM, Christian Gagneraud <address@hidden
<mailto:address@hidden>> wrote:
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 <tel:%2B%20353%20%280%29%201%20236%205990>
Web: http://www.techworks.ie/
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--
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/