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From: | Ben Hilburn |
Subject: | Re: [Discuss-gnuradio] Getting 0, Nan while using usrp2_rx_cfile.py |
Date: | Mon, 21 Nov 2011 09:53:44 -0800 |
Data captured directly from the USRP is stored as 32-bit complex, rather than 64-bit complex (gr.sizeof_gr_complex). To read this data, first useread_short_binary() and then split it into a two dimensional vector:
This works for both Octave and Matlab.
The value 'NaN' indicates an arithmetic or read error. You can google it to find more.
Hello all,
I have faced another problem here. I am really in great trouble and want
this problem to be solved as early as possible.
I am using the usrp2_rx_cfile.py to get the raw IQ data in usrp2.
I am using the following command
sudo python usrp2_rx_cfile.py -f 800M -N 1000 -d 100 -s -v output.dat
After that, I converted the .dat file using octave command
(read_complex_binary).
However, the values I am getting are ambiguous.
I am getting lots of 0 (zeros) and lots of Nan (dont know what does it mean
though)..I have no idea about it.
Here is the snapshot of what I get. I would really appreciate if somebody
can give any idea about this. Thank you.
------snapshot-----------
(9.183409485952689e-41,0)
(NaN,NaN)
(NaN,NaN)
(NaN,NaN)
(NaN,NaN)
(NaN,9.183409485952689e-41)
(NaN,NaN)
(NaN,9.183409485952689e-41)
(NaN,NaN)
(NaN,NaN)
(9.183409485952689e-41,0)
(NaN,9.183409485952689e-41)
(9.183409485952689e-41,0)
(9.183409485952689e-41,9.183409485952689e-41)
(NaN,NaN)
(9.183409485952689e-41,0)
(NaN,NaN)
(0,9.183409485952689e-41)
(NaN,NaN)
(NaN,9.183409485952689e-41)
(NaN,NaN)
(NaN,9.183409485952689e-41)
(0,9.183269356106256e-41)
(9.183409485952689e-41,9.183409485952689e-41)
(9.183409485952689e-41,0)
(9.183409485952689e-41,0)
(9.183409485952689e-41,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
(0,0)
--
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