Re: [Discuss-gnuradio] Capture peaks in gnu radio

[Marcus Müller]

Hi Maksim,

well, that's basically a detector.

From what you describe, you'd take your signal, push it through a spectrum estimator, in the simples case that's just the Mag-Square-FFT, and then write really but a few lines of python code that selects the right "peaks" from the resulting sample vectors and saves them. The sample (vector) number is equivalent to time, and the FFT bin would be equivalent to frequency.
There's really no way around writing your own code -- after all, this is all very specific to your application's needs and is doing something that logically doesn't look like a "stream" operation. But, again, this whole application is really just three blocks, of which you really just need to implement the last one yourself:

USRP source->Log Power FFT->[your block]

That's just a basic concept -- you could also replace "Log Power FFT" by any other power spectrum estimator that you can think of. You don't have to implement your last block in Python, if you're more comfortable with C++...

Best regards,
Marcus

On 02/14/2016 01:24 PM, scott tiger wrote:

Hello all,

Is there any suggestion how to capture or save only several peaks "amplitude and their positions" in the received band.

For example, Using USRP I am receiving 2MHz band but I need to save automatically only several peaks in different frequencies. These peaks can be chosen according to their amplitude. How to make gnu radio choose and save only these peaks and their positions "frequency or time".

Thank you for any help

Best regards

Maksim

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