I had a similar problem where I wanted to measure the phase and magnitude
stability of a system over long periods of time, but only needed small chunks
of data to characterize the drift. I solved this by creating a top block that
uses the head block and a file sink to write a defined number of samples after
doing some other processing. That block was called by a loop like this:
def main(top_block_cls=phase_diff_measure_filechange, options=None):
for x in range(0,600):
time.sleep(8)
tb = top_block_cls()
tb.start(1000000)
time.sleep(2)
tb.stop()
tb.wait()
The only other trick was to make the file names of the files I was saving
contain a time stamp, which was done within def __init__(self): in the
variables section like this:
self.file_phase = file_phase =
path/phase"+datetime.now().strftime("%Y.%m.%d.%H.%M.%S") +".dat"
self.file_mag = file_mag =
path/mag"+datetime.now().strftime("%Y.%m.%d.%H.%M.%S") +".dat"
Those timestamp commands required "import time"
There's probably a more elegant way to do this, but it got the job done.
Hope that helps,
Daniel P. Lundberg, Ph.D.
Senior Research Scientist
Georgia Tech Research Institute
Sensors and Electromagnetic Applications Laboratory
Intelligence, Surveillance, & Reconnaissance Division
404.407.7613
daniel.lundb...@gtri.gatech.edu
-----Original Message-----
From: USRP-users <usrp-users-boun...@lists.ettus.com> On Behalf Of Marcus D.
Leech via USRP-users
Sent: Monday, April 29, 2019 8:24 PM
To: usrp-users@lists.ettus.com
Subject: Re: [USRP-users] How to periodically write files using USRP and
GNUradio
On 04/29/2019 08:08 PM, Mark Wagner via USRP-users wrote:
> Hey all,
>
> I'd like to know how to write short files of streamed USRP data
> periodically using GNUradio. For instance, I'd like the USRP to
> automatically record 5 seconds of data every 10 minutes. It does not
> matter to me whether the USRP is constantly on and most of the data is
> being discarded, or if the USRP wakes up every 10 minutes to record
> the data before sleeping. Whichever is easiest to achieve is fine by
> me. Does anyone have experience doing this kind of thing?
>
> -Mark
>
>
>
> --
> Mark Wagner
> University of California San Diego
> Electrical and Computer Engineering
>
>
If you're using Gnu Radio, you can simply use the file sink, and have it record
to "/dev/null" most of the time, then have something (perhaps via
the XMLRPC built-in feature) change the filename to whatever your desired
filename is, and then revert it back to "/dev/null".
I think I said the same thing on the discuss-gnuradio mailing list a few days
ago.
The usrp-users mailing list isn't the best place to ask Gnu Radio questions, a
question like this, which is inherently radio-type agnostic, probably
belongs on the discuss-gnuradio mailng list, because it's more about "how do
I make Gnu Radio dance".
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