|Subject:||Re: [Discuss-gnuradio] intermittent pulse detection|
|Date:||Tue, 7 Feb 2017 15:22:17 +0100|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0|
Well, if you have a let's say 2 kHz uncertainty in the frequency
of your pulse, I'd really start very simple. Looking at your
plots, I think we can sufficiently suppress the noise simply by
* Use a Low Pass filter (real taps) with a cutoff of 1 kHz – that
will let everything from -1 kHz to +1 kHz around your center
frequency through. You can use the "freq xlating FIR" block to
first shift by a given frequency and then apply the filter; might
make things easier.
If the output of that looks somewhat OK, then you could e.g. low-pass filter the result to get rid of noise pulses that are too short, for example :)
By the way, it might be cool to put up a short recording (ie. a file generated using the GNU Radio file sink) somewhere (zipped, e.g. on Google Drive). I haven't worked with that myself, but maybe putting it on SigIDwiki might be beneficial for people encountering the wildlife tracker signal later on.
I actually think your project is pretty cool – short warning: if
this works out, I'll try to convince you to write a short article
for the GNU Radio blog!
On 02/06/2017 09:39 PM, Dirk Gorissen wrote:
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