You can read the files with Matlab or Octave.

http://www.mail-archive.com/discuss-gnuradio@gnu.org/msg09567.html

This should explain it.

On Sun, Jul 5, 2009 at 8:14 PM, <radul...@eecs.utk.edu> wrote:

> Hi,
>
> I am trying to use C++ to read data from the USRP. I've compiled an
> example found at the following address:
>
> http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/host/apps/test_usrp_standard_rx.cc
> .
> The program seems to run as intended and outputs the data to a file I
> specify with -o. However, when I open the file it is binary and I don't
> understand how the file is structured. I would like to take the data
> stored in this output file and be able to display it graphically. Is the
> file generated by the example above made up of integers? How are they
> structured?
>
>
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>
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