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. KhanDoctral CandidateUniversity of New South WalesNSW 2052, Sydney,
AustraliaP) +61-2-93854208 M)+61-401-260728
Date: Tue, 4 Mar 2008 15:16:17 -0500From: [EMAIL PROTECTED]: [EMAIL PROTECTED]:
[EMAIL PROTECTED]: 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.--PaulPhaysal 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. KhanDoctral CandidateUniversity of New South
WalesNSW 2052, Sydney, AustraliaP) +61-2-93854208 M)+61-401-260728
Date: Mon, 3 Mar 2008 17:02:18 -0500From: [EMAIL PROTECTED]: [EMAIL PROTECTED]:
[EMAIL PROTECTED]: Re: [Discuss-gnuradio] GPS on USRPI'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.--PaulPhaysal 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. KhanDoctral CandidateUniversity of New South WalesNSW 2052, Sydney,
AustraliaP) +61-2-93854208 M)+61-401-260728
Date: Fri, 29 Feb 2008 12:45:29 -0500From: [EMAIL PROTECTED]: [EMAIL
PROTECTED]: [EMAIL PROTECTED]: Re: [Discuss-gnuradio] GPS on USRPFaisal,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.--PaulPhaysal 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. KhanDoctral
CandidateUniversity of New South WalesNSW 2052, Sydney, AustraliaP)
+61-2-93854208 M)+61-401-260728
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