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op25-legacy/python/magsq_psd.py

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2.3 KiB

#!/usr/bin/env python
"""plot power spectral density of magnitude squared, from samples in a file"""
from gnuradio import gr, gru, blks2, optfir
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from gnuradio.wxgui import stdgui2, fftsink2
from optparse import OptionParser
import wx
import sys
class app_top_block(stdgui2.std_top_block):
def __init__(self, frame, panel, vbox, argv):
stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)
self.frame = frame
self.panel = panel
parser = OptionParser(option_class=eng_option)
parser.add_option("-c", "--calibration", type="eng_float", default=0, help="frequency offset", metavar="Hz")
parser.add_option("-i", "--input", default="baseband.dat", help="specify input file")
parser.add_option("-r", "--repeat", action="store_true", default=False, help="repeat in a loop")
parser.add_option("-s", "--sample-rate", type="eng_float", default=0, help="sample rate")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
sample_rate = options.sample_rate
symbol_rate = 4800
resample_rate = symbol_rate * 4
FILE = gr.file_source(gr.sizeof_gr_complex, options.input, options.repeat)
THROTTLE = gr.throttle(gr.sizeof_gr_complex, sample_rate)
# resample to new rate = resample_rate
nphases = 64
frac_bw = 0.25
rs_taps = gr.firdes.low_pass(nphases, nphases, frac_bw, 0.5-frac_bw)
#rs_rate = sample_rate / float(resample_rate)
rs_rate = resample_rate / float(sample_rate)
RESAMP = blks2.pfb_arb_resampler_ccf(rs_rate, (rs_taps), nphases,)
channel_taps = optfir.low_pass(1.0, resample_rate, 6500, 8000, 0.1, 60)
TUNE = gr.freq_xlating_fir_filter_ccf(1, channel_taps, options.calibration, resample_rate)
# get magnitude squared
P = gr.complex_to_mag_squared()
# plot FFT
SCOPE = fftsink2.fft_sink_f (panel, fft_size=2048, sample_rate=resample_rate)
self.connect(FILE, THROTTLE, RESAMP, TUNE, P, SCOPE)
vbox.Add(SCOPE.win, 10, wx.EXPAND)
def main ():
app = stdgui2.stdapp(app_top_block, "Signal Scope", nstatus=1)
app.MainLoop()
if __name__ == '__main__':
main ()