[USRP-users] Airprobe *.cfile decoding problem

Marek Pleskot marek.pleskot at gmail.com
Thu Feb 21 16:34:47 EST 2013


Hi,

I'm completely fresh in this matter. I'm going to buy some ettus device but
before that I would like to test how the airprobe and gnuradio works.

I wanted to decode *.cfile using airprobe.

I have the following installation:

gnuradio: git version from 2013.02.12

airprobe: newest available git veriosn

OS: ubuntu 12.04

The file which I wanted to decode is the following:
http://reflextor.com/vf_call6_a725_d174_g5_Kc1EF00BAB3BAC7002.cfile.gz



I did my trials in two attempts:

1. First with “usrp” set in gsm_scan.py

2. Second with “uhd” set in gsm_scan.py



But unfortunately I've encountered problems:



1. [USRP attempt] First problem occurred when I'v trying to decode *.cfile
file using gsm_scan.py with the following setting: "from gnuradio import
usrp". Below is shown what I got in this attempt:



parallels at parallels-Parallels-Virtual-Platform:~/airprobe/gsm-tvoid/src/python$
./go.sh vf_call6_a725_d174_g5_Kc1EF00BAB3BAC7002.cfile

go.sh <file.cfile> [decim==112]

Traceback (most recent call last):

  File "./gsm_scan.py", line 21, in <module>

    from gnuradio import usrp

ImportError: cannot import name usrp

parallels at parallels-Parallels-Virtual-Platform:~/airprobe/gsm-tvoid/src/python$




2.[UHD attempt] After failure with first (USRP) attempt I decided to change
approach. Second problem occurred when I was trying to decode *.cfile file
using gsm_scan.py with the following setting: "from gnuradio import uhd".
Below is shown what I got in this attempt:



parallels at parallels-Parallels-Virtual-Platform:~/airprobe/gsm-tvoid/src/python$
./go.sh vf_call6_a725_d174_g5_Kc1EF00BAB3BAC7002.cfile

go.sh <file.cfile> [decim==112]

    0: ce WARN: packet to short

HEX l2_data_out_Bbis:462 Format Bbis DATA

000: ce 46 3b 10 48 00 d0 03  - 00 50 01 29 3c b5 15 f7

001: 00 00 00 00 00 00 00

    0: ce 110011-- Pseudo Length: 51

    1: 46 0------- Direction: From originating site

    1: 46 -100---- 4 TransactionID

    1: 46 ----0110 Radio Resouce Management

    2: 3b ???????? UNKNOWN. FIXME

    2: 3b XXXXXXXX UNKNOWN DATA (14 bytes)

    2: 3b YYYYYYYY REST OCTETS (21)

% offset =  0.0 clock =  64000000.0

Reading data from: vf_call6_a725_d174_g5_Kc1EF00BAB3BAC7002.cfile

>>> gr_fir_ccc: using SSE

>>> gr_fir_ccf: using SSE

(python:27589): Gtk-CRITICAL **: IA__gtk_window_resize: assertion `width >
0' failed

Segmentation fault (core dumped)

parallels at parallels-Parallels-Virtual-Platform:~/airprobe/gsm-tvoid/src/python$




Maybe somebody could help me resolve these problems, both for first(usrp)
and second (uhd) attempts.

I'll appreciate for help.



Thanks in advance

Best regards,

Marek
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