Hi,
I used usrp_fft, and I can see a CW at 1575.42MHz, so it means that it
is in the working condition, although I still get the same error msg
once everytime i run anything. It says
$python usrp_fft.py -f 1.57542G
usb_contro_msg failed: usb_control_msg: sending control message
failed, win error: A device attached to the system is not functioning.
But as I said, that I can see the generated CW on the usrp_fft graph,
and the CW displayed on this graph follows the changes in frequency
and amplitude made from signal generator, then I think we can ignore
this error msg. We should be ready to move forward.
I am trying to use usrp_rx_cfile.py which I have altered as:
u = usrp.source_c (0, options.decim, 1, gru.hexint(options.mux), 0)
u.set_rx_freq (0, options.ddc_freq)
u.set_pga (0, options.gain)
u.set_pga (1, options.gain)
c2r=gr.complex_to_real()
dst = gr.file_sink (gr.sizeof_float, options.output_file)
#fg.connect (u, dst)
fg.connect(u,c2r,dst)
also, I am saving data to file as:
self.dst = gr.file_sink(gr.sizeof_float, filename)
as the data is no more complex.
Now if I connect GPS antenna to my usrp board and run
python usrp_rx_cfile.py -c 1574.015M -o gps_IF_real_samples.dat
where IF = 1575.42M - 1574.015M =1.405M
this should give me a file consisting of real IF samples of GPS data,
ok to use with Kai Borre software receiver. but this isn't happening! :S
Am I usring usrp_rx_cfile.py incorrectly or do I need to implement any
filtering around this frequency?.... or I am missing a very basic
thing here!?
Faisal A. Khan
Doctral Candidate
University of New South Wales
NSW 2052, Sydney, Australia
P) +61-2-93854208 M)+61-401-260728
------------------------------------------------------------------------
Date: Tue, 4 Mar 2008 15:16:17 -0500
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
CC: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] GPS on USRP
I really don't think you should be getting any error messages.
Could you copy the entire error message into an email? I might
not be able to identify the problem, but maybe someone else on the
list can. In the mean time, let's verify receipt of a test signal
through the USRP.
I recommend running the example "usrp_wfm_rcv.py", located in
/usr/local/share/gnuradio/examples/usrp/ on my Linux
installation. It's essentially a limited spectrum analyzer.
Hopefully you've got access to a signal generator. Start with a
test signal at -40 dBm or so, at L1 (1575.42 MHz) for good
measure. The program will likely automatically select your DBSRX
card, but if you need to set specific options, use the '-help'
flag on the command line to see the options. Do you get errors
running this? If so, tell me exactly what they are.
--Paul
Phaysal Khan wrote:
Hi,
yes, I can run the test and it says at the end
Max USB/USRP throughput = 32MB/sec
although it gives that error msg 3 times for each usb
throughput check (3 times for each 2M, 4M, 8M, 16M and 32M).
I am using DBSRX daughter card, which covers the GPS band, and
this is physically installed. I think we are ready to move
forward.
Faisal A. Khan
Doctral Candidate
University of New South Wales
NSW 2052, Sydney, Australia
P) +61-2-93854208 M)+61-401-260728
------------------------------------------------------------------------
Date: Mon, 3 Mar 2008 17:02:18 -0500
From: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
CC: discuss-gnuradio@gnu.org <mailto:discuss-gnuradio@gnu.org>
Subject: Re: [Discuss-gnuradio] GPS on USRP
I'd start by running usrp_benchmark_usb.py It's a USB
speed test script, and it will verify proper communication
with the USRP. The script is located in
/usr/local/share/gnuradio/examples/usrp/ on my Linux
installation.
Do you have a DBSRX daughter card to receive GPS
frequencies? If that's physically installed and the test
script mentioned above runs, we can move on.
--Paul
Phaysal Khan wrote:
Hi Paul,
Finally I got a working system of USRP radio. The FM
radio example runs smoothly (atleast opens up and
captures nothing:giving errors like "usb_control_msg
failed: usb_control_msg failed: sending control
message failed, win error, A device attached to the
system is not functioning <--- Is this ok? I
am using cygwin, gnu-3.1.1 and python 2.5)!?
Now, I would like to record IF samples and use Kai
Borre Matlab based GPS receiver to solve for
position. Should we proceed with sample recording. Can
you guide me for this?
Faisal A. Khan
Doctral Candidate
University of New South Wales
NSW 2052, Sydney, Australia
P) +61-2-93854208 M)+61-401-260728
------------------------------------------------------------------------
Date: Fri, 29 Feb 2008 12:45:29 -0500
From: [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
CC: discuss-gnuradio@gnu.org
<mailto:discuss-gnuradio@gnu.org>
Subject: Re: [Discuss-gnuradio] GPS on USRP
Faisal,
I'm at Purdue University working toward using
the USRP for GNSS applications. Check my
understanding: are you wanting to use the USRP
to record, say, L1 band samples directly to a
data file? Would you be performing all of the
signal acquisition and tracking in
post-processing with a separate software tool?
I'm working on Linux (Debian), but we aught to
be able to trade notes. If you've got a
working installation of GNU Radio, I can show
you how to record samples.
--Paul
Phaysal Khan wrote:
Hi,
I am a newbie to USRP, and still
struggling to get it working on my windows
machine. I am trying to use cygwin.
I reckon that many ppl have already
acquired and tracked GPS on USRP. Waht I
want to do is to capture GPS IF samples
(e.g. at IF=5 MHz) and use a software
receiver to process those IF samples on
PC. Any suggestions to start?!...
Faisal A. Khan
Doctral Candidate
University of New South Wales
NSW 2052, Sydney, Australia
P) +61-2-93854208 M)+61-401-260728
------------------------------------------------------------------------
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