/usr/bin/hrpt_demod is in gnuradio 3.5.3.2-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | #!/usr/bin/python
#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Hrpt Demod
# Generated: Thu Oct 27 13:51:59 2011
##################################################
from gnuradio import digital
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import noaa
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from optparse import OptionParser
import math, os
class hrpt_demod(gr.top_block):
def __init__(self, input_filename="usrp.dat", output_filename="frames.dat", decim=32, pll_alpha=0.01, clock_alpha=0.01):
gr.top_block.__init__(self, "Hrpt Demod")
##################################################
# Parameters
##################################################
self.input_filename = input_filename
self.output_filename = output_filename
self.decim = decim
self.pll_alpha = pll_alpha
self.clock_alpha = clock_alpha
##################################################
# Variables
##################################################
self.sym_rate = sym_rate = 600*1109
self.sample_rate = sample_rate = 4e6
self.sps = sps = sample_rate/sym_rate
self.max_clock_offset = max_clock_offset = 100e-6
self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
self.hs = hs = int(sps/2.0)
##################################################
# Blocks
##################################################
self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset)
self.noaa_hrpt_deframer_0 = noaa.hrpt_deframer()
self.gr_moving_average_xx_0 = gr.moving_average_ff(hs, 1.0/hs, 4000)
self.gr_file_sink_0 = gr.file_sink(gr.sizeof_short*1, output_filename)
self.gr_file_sink_0.set_unbuffered(False)
self.file_source = gr.file_source(gr.sizeof_short*1, input_filename, False)
self.digital_clock_recovery_mm_xx_0 = digital.clock_recovery_mm_ff(sps/2.0, clock_alpha**2/4.0, 0.5, clock_alpha, max_clock_offset)
self.digital_binary_slicer_fb_0 = digital.binary_slicer_fb()
self.decoder = noaa.hrpt_decoder(True,False)
self.cs2cf = gr.interleaved_short_to_complex()
self.agc = gr.agc_cc(1e-5, 1.0, 1.0/32768.0, 1.0)
##################################################
# Connections
##################################################
self.connect((self.file_source, 0), (self.cs2cf, 0))
self.connect((self.pll, 0), (self.gr_moving_average_xx_0, 0))
self.connect((self.cs2cf, 0), (self.agc, 0))
self.connect((self.agc, 0), (self.pll, 0))
self.connect((self.noaa_hrpt_deframer_0, 0), (self.gr_file_sink_0, 0))
self.connect((self.noaa_hrpt_deframer_0, 0), (self.decoder, 0))
self.connect((self.gr_moving_average_xx_0, 0), (self.digital_clock_recovery_mm_xx_0, 0))
self.connect((self.digital_clock_recovery_mm_xx_0, 0), (self.digital_binary_slicer_fb_0, 0))
self.connect((self.digital_binary_slicer_fb_0, 0), (self.noaa_hrpt_deframer_0, 0))
def get_input_filename(self):
return self.input_filename
def set_input_filename(self, input_filename):
self.input_filename = input_filename
def get_output_filename(self):
return self.output_filename
def set_output_filename(self, output_filename):
self.output_filename = output_filename
def get_decim(self):
return self.decim
def set_decim(self, decim):
self.decim = decim
def get_pll_alpha(self):
return self.pll_alpha
def set_pll_alpha(self, pll_alpha):
self.pll_alpha = pll_alpha
self.pll.set_alpha(self.pll_alpha)
self.pll.set_beta(self.pll_alpha**2/4.0)
def get_clock_alpha(self):
return self.clock_alpha
def set_clock_alpha(self, clock_alpha):
self.clock_alpha = clock_alpha
self.digital_clock_recovery_mm_xx_0.set_gain_omega(self.clock_alpha**2/4.0)
self.digital_clock_recovery_mm_xx_0.set_gain_mu(self.clock_alpha)
def get_sym_rate(self):
return self.sym_rate
def set_sym_rate(self, sym_rate):
self.sym_rate = sym_rate
self.set_sps(self.sample_rate/self.sym_rate)
def get_sample_rate(self):
return self.sample_rate
def set_sample_rate(self, sample_rate):
self.sample_rate = sample_rate
self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
self.set_sps(self.sample_rate/self.sym_rate)
def get_sps(self):
return self.sps
def set_sps(self, sps):
self.sps = sps
self.set_hs(int(self.sps/2.0))
self.digital_clock_recovery_mm_xx_0.set_omega(self.sps/2.0)
def get_max_clock_offset(self):
return self.max_clock_offset
def set_max_clock_offset(self, max_clock_offset):
self.max_clock_offset = max_clock_offset
def get_max_carrier_offset(self):
return self.max_carrier_offset
def set_max_carrier_offset(self, max_carrier_offset):
self.max_carrier_offset = max_carrier_offset
self.pll.set_max_offset(self.max_carrier_offset)
def get_hs(self):
return self.hs
def set_hs(self, hs):
self.hs = hs
self.gr_moving_average_xx_0.set_length_and_scale(self.hs, 1.0/self.hs)
if __name__ == '__main__':
parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
parser.add_option("-F", "--input-filename", dest="input_filename", type="string", default="usrp.dat",
help="Set usrp.dat [default=%default]")
parser.add_option("-o", "--output-filename", dest="output_filename", type="string", default="frames.dat",
help="Set frames.dat [default=%default]")
parser.add_option("-d", "--decim", dest="decim", type="intx", default=32,
help="Set None [default=%default]")
parser.add_option("-p", "--pll-alpha", dest="pll_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
help="Set None [default=%default]")
parser.add_option("-s", "--clock-alpha", dest="clock_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
help="Set None [default=%default]")
(options, args) = parser.parse_args()
tb = hrpt_demod(input_filename=options.input_filename, output_filename=options.output_filename, decim=options.decim, pll_alpha=options.pll_alpha, clock_alpha=options.clock_alpha)
tb.run()
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