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Re: [Discuss-gnuradio] Extracting and storing certain parameters from co

From: Richard Bell
Subject: Re: [Discuss-gnuradio] Extracting and storing certain parameters from continuous IQ data
Date: Wed, 11 Mar 2015 14:35:42 -0700


I can't tell you how you should do this. I can tell you that you will need to get comfortable with tags and probably messages to achieve these things you want. If you haven't already, check out the gnuradio tutorial on programming topics to get started. They do a pretty good job explaining it there. http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorial_Programming_Topics

For example, suppose you only wanted to store a certain stream of data after a preamble was detected. You could use a 'correlate and sync - tag' block to adds tags at the start of your data to the stream and then feed this into a 'tagged file sink' block which will only put the portion after the tag into the file. You want a lot more functionality then this, but this could get you going in the right direction.


On Wed, Mar 11, 2015 at 2:24 PM, Ali Riaz <address@hidden> wrote:
Hello everyone,

So I was trying to capture continuous IQ data from my USRP N200, and this needs to be done for about a week, but because the amount of data is ginormous, that's doesn't seem feasible at all. Instead, what I'm now thinking of doing is processing the data in gnuradio companion in real time and just extracting certain parameters from the processed data, for instance, I would like to detect if there's a signal present or not, at what time was the signal detected, what's the maximum amplitude of the signal, how long did the signal last etc, and just store those pieces of information in a file.

Are there any pre-existing blocks that I may use for this purpose? If not, can someone please guide me as to how to accomplish this task?

This is what my flow graph looks like at the moment: http://imgur.com/a/O2gXi

Thank you,


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