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Nick Foster nick at ettus.comOn Sun, Aug 5, 2012 at 11:45 AM, Christian Gagneraud <chris at techworks.ie>wrote: > Hi there, > > I saw a message in the July archive (I wasn't subscribed yet at that date) > about updating gr-ais with osmosdr support. > I was working on the same thing recently, so i decided to publish my fixes > on top of Antoine's one. > The result can be found here: > https://github.com/chgans/gr-**ais <https://github.com/chgans/gr-ais> > > I got it working with both an FCD and an RTL: > ais_rx.py --rate 96e3 --gain 30 --error -17 -d -D fcd=0 > ais_rx.py --rate 1024e3 --gain 30 --error -110 -d -D rtl=0 > Thanks for doing this. I haven't been looking at gr-ais lately as I've been doing gr-air-modes development in anticipation of our DefCon talk. Now that that's over, I'll have some time to integrate these changes and hopefully modernize a few things in gr-ais which I've been putting off. > > Strangely passing freq_err=XX parameter to the source (using -D), doesn't > work, the use of --error is thus needed (which will do a set_freq_corr()). > > Antoine, if you want sample file, just let me know. > > Nick, are you willing to integrate these changing back in gr-ais, Apart > from the added automatic decimation filter, the changes are not intrusive > at all. > Yep, I'll pull it back in. I'm also going to need your help vetting the changes against the FCD, as I don't have one. I do have an RTL dongle I can do some testing with. Have you had much success with AIS on RTL? --n > > The default settings for UHD are 256Khz sampling with decimation filter 4, > with this change, the decimation is one when using FCD (96KHz fixed > frequency) and 16 for RTL when used at 1.024MHz (this was the minimum > working frequency for me). > Or maybe would you prefer to allow the user to set it manually, and use > this technique as a fall back only. > > Please let me know what you guys think. > > Thx, > 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/ > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120805/2d3ff8ac/attachment.htm>