forked from sdr/gr-osmosdr
apps: add spectrum sense app ported from gnuradio master
parent
3393647bec
commit
c0b5ece489
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@ -30,5 +30,6 @@ GR_PYTHON_INSTALL(
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osmocom_fft
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osmocom_siggen
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osmocom_siggen_nogui
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osmocom_spectrum_sense
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DESTINATION ${GR_RUNTIME_DIR}
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)
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@ -0,0 +1,293 @@
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#!/usr/bin/env python
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#
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# Copyright 2005,2007,2011 Free Software Foundation, Inc.
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#
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# This file is part of GNU Radio
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#
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# GNU Radio is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# GNU Radio is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GNU Radio; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import osmosdr
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from gnuradio import gr, eng_notation, window
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from gnuradio import audio
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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import sys
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import math
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import struct
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import threading
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from datetime import datetime
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sys.stderr.write("Warning: this may have issues on some machines+Python version combinations to seg fault due to the callback in bin_statitics.\n\n")
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class ThreadClass(threading.Thread):
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def run(self):
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return
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class tune(gr.feval_dd):
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"""
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This class allows C++ code to callback into python.
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"""
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def __init__(self, tb):
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gr.feval_dd.__init__(self)
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self.tb = tb
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def eval(self, ignore):
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"""
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This method is called from gr.bin_statistics_f when it wants
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to change the center frequency. This method tunes the front
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end to the new center frequency, and returns the new frequency
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as its result.
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"""
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try:
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# We use this try block so that if something goes wrong
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# from here down, at least we'll have a prayer of knowing
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# what went wrong. Without this, you get a very
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# mysterious:
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#
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# terminate called after throwing an instance of
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# 'Swig::DirectorMethodException' Aborted
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#
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# message on stderr. Not exactly helpful ;)
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new_freq = self.tb.set_next_freq()
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# wait until msgq is empty before continuing
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while(self.tb.msgq.full_p()):
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#print "msgq full, holding.."
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time.sleep(0.1)
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return new_freq
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except Exception, e:
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print "tune: Exception: ", e
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class parse_msg(object):
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def __init__(self, msg):
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self.center_freq = msg.arg1()
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self.vlen = int(msg.arg2())
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assert(msg.length() == self.vlen * gr.sizeof_float)
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# FIXME consider using NumPy array
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t = msg.to_string()
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self.raw_data = t
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self.data = struct.unpack('%df' % (self.vlen,), t)
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class my_top_block(gr.top_block):
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def __init__(self):
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gr.top_block.__init__(self)
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usage = "usage: %prog [options] min_freq max_freq"
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parser = OptionParser(option_class=eng_option, usage=usage)
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parser.add_option("-a", "--args", type="string", default="",
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help="Device args [default=%default]")
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parser.add_option("-A", "--antenna", type="string", default=None,
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help="Select antenna where appropriate")
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parser.add_option("-s", "--samp-rate", type="eng_float", default=None,
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help="Set sample rate (bandwidth), minimum by default")
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parser.add_option("-g", "--gain", type="eng_float", default=None,
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help="Set gain in dB (default is midpoint)")
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parser.add_option("", "--tune-delay", type="eng_float",
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default=0.25, metavar="SECS",
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help="Time to delay (in seconds) after changing frequency [default=%default]")
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parser.add_option("", "--dwell-delay", type="eng_float",
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default=0.25, metavar="SECS",
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help="Time to dwell (in seconds) at a given frequency [default=%default]")
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parser.add_option("-b", "--channel-bandwidth", type="eng_float",
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default=6.25e3, metavar="Hz",
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help="Channel bandwidth of fft bins in Hz [default=%default]")
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parser.add_option("-q", "--squelch-threshold", type="eng_float",
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default=None, metavar="dB",
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help="Squelch threshold in dB [default=%default]")
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parser.add_option("-F", "--fft-size", type="int", default=None,
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help="Specify number of FFT bins [default=samp_rate/channel_bw]")
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parser.add_option("", "--real-time", action="store_true", default=False,
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help="Attempt to enable real-time scheduling")
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(options, args) = parser.parse_args()
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if len(args) != 2:
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parser.print_help()
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sys.exit(1)
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self.channel_bandwidth = options.channel_bandwidth
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self.min_freq = eng_notation.str_to_num(args[0])
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self.max_freq = eng_notation.str_to_num(args[1])
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if self.min_freq > self.max_freq:
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# swap them
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self.min_freq, self.max_freq = self.max_freq, self.min_freq
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if not options.real_time:
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realtime = False
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else:
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# Attempt to enable realtime scheduling
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r = gr.enable_realtime_scheduling()
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if r == gr.RT_OK:
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realtime = True
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else:
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realtime = False
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print "Note: failed to enable realtime scheduling"
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# build graph
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self.u = osmosdr.source_c(options.args)
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# Set the antenna
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if(options.antenna):
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self.u.set_antenna(options.antenna, 0)
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if options.samp_rate is None:
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options.samp_rate = self.u.get_sample_rates().start()
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self.u.set_sample_rate(options.samp_rate)
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self.usrp_rate = usrp_rate = self.u.get_sample_rate()
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if options.fft_size is None:
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self.fft_size = int(self.usrp_rate/self.channel_bandwidth)
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else:
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self.fft_size = options.fft_size
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self.squelch_threshold = options.squelch_threshold
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s2v = gr.stream_to_vector(gr.sizeof_gr_complex, self.fft_size)
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mywindow = window.blackmanharris(self.fft_size)
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fft = gr.fft_vcc(self.fft_size, True, mywindow, True)
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power = 0
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for tap in mywindow:
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power += tap*tap
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c2mag = gr.complex_to_mag_squared(self.fft_size)
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# FIXME the log10 primitive is dog slow
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#log = gr.nlog10_ff(10, self.fft_size,
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# -20*math.log10(self.fft_size)-10*math.log10(power/self.fft_size))
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# Set the freq_step to 75% of the actual data throughput.
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# This allows us to discard the bins on both ends of the spectrum.
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self.freq_step = self.nearest_freq((0.75 * self.usrp_rate), self.channel_bandwidth)
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self.min_center_freq = self.min_freq + (self.freq_step/2)
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nsteps = math.ceil((self.max_freq - self.min_freq) / self.freq_step)
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self.max_center_freq = self.min_center_freq + (nsteps * self.freq_step)
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self.next_freq = self.min_center_freq
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tune_delay = max(0, int(round(options.tune_delay * usrp_rate / self.fft_size))) # in fft_frames
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dwell_delay = max(1, int(round(options.dwell_delay * usrp_rate / self.fft_size))) # in fft_frames
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self.msgq = gr.msg_queue(1)
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self._tune_callback = tune(self) # hang on to this to keep it from being GC'd
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stats = gr.bin_statistics_f(self.fft_size, self.msgq,
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self._tune_callback, tune_delay,
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dwell_delay)
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# FIXME leave out the log10 until we speed it up
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#self.connect(self.u, s2v, fft, c2mag, log, stats)
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self.connect(self.u, s2v, fft, c2mag, stats)
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if options.gain is None:
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# if no gain was specified, use the mid-point in dB
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g = self.u.get_gain_range()
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options.gain = float(g.start()+g.stop())/2.0
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self.set_gain(options.gain)
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print "gain =", options.gain
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def set_next_freq(self):
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target_freq = self.next_freq
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self.next_freq = self.next_freq + self.freq_step
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if self.next_freq >= self.max_center_freq:
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self.next_freq = self.min_center_freq
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if not self.set_freq(target_freq):
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print "Failed to set frequency to", target_freq
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sys.exit(1)
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return target_freq
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def set_freq(self, target_freq):
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"""
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Set the center frequency we're interested in.
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@param target_freq: frequency in Hz
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@rypte: bool
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"""
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r = self.u.set_center_freq(target_freq)
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if r:
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return True
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return False
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def set_gain(self, gain):
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self.u.set_gain(gain)
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def nearest_freq(self, freq, channel_bandwidth):
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freq = round(freq / channel_bandwidth, 0) * channel_bandwidth
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return freq
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def main_loop(tb):
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def bin_freq(i_bin, center_freq):
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#hz_per_bin = tb.usrp_rate / tb.fft_size
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freq = center_freq - (tb.usrp_rate / 2) + (tb.channel_bandwidth * i_bin)
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#print "freq original:",freq
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#freq = nearest_freq(freq, tb.channel_bandwidth)
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#print "freq rounded:",freq
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return freq
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bin_start = int(tb.fft_size * ((1 - 0.75) / 2))
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bin_stop = int(tb.fft_size - bin_start)
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while 1:
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# Get the next message sent from the C++ code (blocking call).
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# It contains the center frequency and the mag squared of the fft
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m = parse_msg(tb.msgq.delete_head())
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# m.center_freq is the center frequency at the time of capture
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# m.data are the mag_squared of the fft output
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# m.raw_data is a string that contains the binary floats.
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# You could write this as binary to a file.
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for i_bin in range(bin_start, bin_stop):
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center_freq = m.center_freq
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freq = bin_freq(i_bin, center_freq)
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#noise_floor_db = -174 + 10*math.log10(tb.channel_bandwidth)
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noise_floor_db = 10*math.log10(min(m.data)/tb.usrp_rate)
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power_db = 10*math.log10(m.data[i_bin]/tb.usrp_rate) - noise_floor_db
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if (power_db > tb.squelch_threshold) and (freq >= tb.min_freq) and (freq <= tb.max_freq):
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print datetime.now(), "center_freq", center_freq, "freq", freq, "power_db", power_db, "noise_floor_db", noise_floor_db
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if __name__ == '__main__':
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t = ThreadClass()
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t.start()
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tb = my_top_block()
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try:
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tb.start()
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main_loop(tb)
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except KeyboardInterrupt:
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pass
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