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: address@hidden
To: address@hidden
CC: address@hidden
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: address@hidden
To: address@hidden
CC: address@hidden
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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