Re: [Discuss-gnuradio] USRP network based spectrum analyzer

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<timestamp>Wed Sep 28 17:33:19 2011</timestamp>
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<key>id</key>
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</block>
<connection>
<source_block_id>uhd_usrp_source_0</source_block_id>
<sink_block_id>blks2_logpwrfft_x_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blks2_logpwrfft_x_0</source_block_id>
<sink_block_id>gr_file_sink_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
</flow_graph>
#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Uhd Fft To File
# Generated: Wed Sep 28 17:33:21 2011
##################################################

from gnuradio import blks2
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import uhd
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from optparse import OptionParser
import SimpleXMLRPCServer
import threading

class uhd_fft_to_file(gr.top_block):

def __init__(self, frequency=100e6, gain=20, srate=1.0e6, xmlport=6060, fifoname="fft_output_fifo", devicecfg="addr=192.168.10.2"):
gr.top_block.__init__(self, "Uhd Fft To File")

##################################################
# Parameters
##################################################
self.frequency = frequency
self.gain = gain
self.srate = srate
self.xmlport = xmlport
self.fifoname = fifoname
self.devicecfg = devicecfg

##################################################
# Variables
##################################################
self.samp_rate = samp_rate = srate
self.fft_size = fft_size = 2048

##################################################
# Blocks
##################################################
self.xmlrpc_server_0 = SimpleXMLRPCServer.SimpleXMLRPCServer(("localhost", xmlport), allow_none=True)
self.xmlrpc_server_0.register_instance(self)
threading.Thread(target=self.xmlrpc_server_0.serve_forever).start()
self.uhd_usrp_source_0 = uhd.usrp_source(
device_addr="devicefg",
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1,
)
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
self.uhd_usrp_source_0.set_center_freq(frequency, 0)
self.uhd_usrp_source_0.set_gain(gain, 0)
self.gr_file_sink_0 = gr.file_sink(gr.sizeof_float*fft_size, fifoname)
self.gr_file_sink_0.set_unbuffered(True)
self.blks2_logpwrfft_x_0 = blks2.logpwrfft_c(
sample_rate=samp_rate,
fft_size=fft_size,
ref_scale=2,
frame_rate=5,
avg_alpha=0.1,
average=True,
)

##################################################
# Connections
##################################################
self.connect((self.uhd_usrp_source_0, 0), (self.blks2_logpwrfft_x_0, 0))
self.connect((self.blks2_logpwrfft_x_0, 0), (self.gr_file_sink_0, 0))

def get_frequency(self):
return self.frequency

def set_frequency(self, frequency):
self.frequency = frequency
self.uhd_usrp_source_0.set_center_freq(self.frequency, 0)

def get_gain(self):
return self.gain

def set_gain(self, gain):
self.gain = gain
self.uhd_usrp_source_0.set_gain(self.gain, 0)

def get_srate(self):
return self.srate

def set_srate(self, srate):
self.srate = srate
self.set_samp_rate(self.srate)

def get_xmlport(self):
return self.xmlport

def set_xmlport(self, xmlport):
self.xmlport = xmlport

def get_fifoname(self):
return self.fifoname

def set_fifoname(self, fifoname):
self.fifoname = fifoname

def get_devicecfg(self):
return self.devicecfg

def set_devicecfg(self, devicecfg):
self.devicecfg = devicecfg

def get_samp_rate(self):
return self.samp_rate

def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.blks2_logpwrfft_x_0.set_sample_rate(self.samp_rate)
self.uhd_usrp_source_0.set_samp_rate(self.samp_rate)

def get_fft_size(self):
return self.fft_size

def set_fft_size(self, fft_size):
self.fft_size = fft_size

if __name__ == '__main__':
parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
parser.add_option("", "--frequency", dest="frequency", type="eng_float", default=eng_notation.num_to_str(100e6),
help="Set frequency [default=%default]")
parser.add_option("", "--gain", dest="gain", type="eng_float", default=eng_notation.num_to_str(20),
help="Set gain [default=%default]")
parser.add_option("", "--srate", dest="srate", type="eng_float", default=eng_notation.num_to_str(1.0e6),
help="Set srate [default=%default]")
parser.add_option("", "--xmlport", dest="xmlport", type="intx", default=6060,
help="Set xmlport [default=%default]")
parser.add_option("", "--fifoname", dest="fifoname", type="string", default="fft_output_fifo",
help="Set fifoname [default=%default]")
parser.add_option("", "--devicecfg", dest="devicecfg", type="string", default="addr=192.168.10.2",
help="Set devicecfg [default=%default]")
(options, args) = parser.parse_args()
tb = uhd_fft_to_file(frequency=options.frequency, gain=options.gain, srate=options.srate, xmlport=options.xmlport, fifoname=options.fifoname, devicecfg=options.devicecfg)
tb.run()

On 28/09/2011 4:50 PM, Phelps Williams wrote:
> I have a usrp and computer in a remote location without much network
> bandwidth available to the system and I'm using it as a spectrum
> analyzer. I'd like to run the fft on the remote system and then send
> the results to a connected client for display. This would allow me to
> get greater fidelity than xwindows forwarding or the ascii dft example
> while also using less bandwidth. I would imagine the client side
> would potentially reuse some of the existing wx or qt interfaces for
> display and control.
>
> This seems like a pretty useful / simple use of this hardware. Does
> anybody know of any implementations floating around that does this?
> I'd prefer not to reinvent the wheel.
>
> -Phelps
>
Because I'm such an insanely nice guy, I quickly implemented something
like what you'd need. Attached.

It uses a UHD source, computes a (default 2048-point) 10*log10-scaled
FFT, then outputs the resulting float-vector to a file-sink at a 5Hz rate.

Everything is pretty-much parameterized on the command line, including:

frequency (100M)
gain (20)
srate (1.0e6)
fifoname ("fft_output_fifo")
devicecfg ("addr=192.168.10.2")
xmlport (6060)

I've included the ability to change parameters on-the-fly using the
XMLRPC server, which would allow you to, for example, change
run-time parameters from some external interface, such as a WEB gui
or similar.

If this were my problem, I'd start this thing in a script which creates
the fifo file, starts some program that reads the FIFO (left as an
exercise for the proverbial reader) in the background, then calls the
Gnu Radio program.