git.gag.com Git - debian/gnuradio/blob - gr-noaa/apps/hrpt_demod.py

   1 #!/usr/bin/env python
   2 ##################################################
   3 # Gnuradio Python Flow Graph
   4 # Title: Hrpt Demod
   5 # Generated: Sun Nov  8 10:41:08 2009
   6 ##################################################
   7
   8 from gnuradio import eng_notation
   9 from gnuradio import gr
  10 from gnuradio import noaa
  11 from gnuradio.eng_option import eng_option
  12 from gnuradio.gr import firdes
  13 from optparse import OptionParser
  14 import math, os
  15
  16 class hrpt_demod(gr.top_block):
  17
  18         def __init__(self, input_filename="usrp.dat", output_filename="frames.dat", decim=32, pll_alpha=0.01, clock_alpha=0.01):
  19                 gr.top_block.__init__(self, "Hrpt Demod")
  20
  21                 ##################################################
  22                 # Parameters
  23                 ##################################################
  24                 self.input_filename = input_filename
  25                 self.output_filename = output_filename
  26                 self.decim = decim
  27                 self.pll_alpha = pll_alpha
  28                 self.clock_alpha = clock_alpha
  29
  30                 ##################################################
  31                 # Variables
  32                 ##################################################
  33                 self.sym_rate = sym_rate = 600*1109
  34                 self.sample_rate = sample_rate = 64e6/decim
  35                 self.sps = sps = sample_rate/sym_rate
  36                 self.max_clock_offset = max_clock_offset = 100e-6
  37                 self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
  38                 self.hs = hs = int(sps/2.0)
  39
  40                 ##################################################
  41                 # Blocks
  42                 ##################################################
  43                 self.agc = gr.agc_cc(1e-5, 1.0, 1.0/32768.0, 1.0)
  44                 self.cs2cf = gr.interleaved_short_to_complex()
  45                 self.decoder = noaa.hrpt_decoder(True,False)
  46                 self.file_source = gr.file_source(gr.sizeof_short*1, input_filename, False)
  47                 self.gr_binary_slicer_fb_0 = gr.binary_slicer_fb()
  48                 self.gr_clock_recovery_mm_xx_0 = gr.clock_recovery_mm_ff(sps/2.0, clock_alpha**2/4.0, 0.5, clock_alpha, max_clock_offset)
  49                 self.gr_file_sink_0 = gr.file_sink(gr.sizeof_short*1, output_filename)
  50                 self.gr_moving_average_xx_0 = gr.moving_average_ff(hs, 1.0/hs, 4000)
  51                 self.noaa_hrpt_deframer_0 = noaa.hrpt_deframer()
  52                 self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset)
  53
  54                 ##################################################
  55                 # Connections
  56                 ##################################################
  57                 self.connect((self.file_source, 0), (self.cs2cf, 0))
  58                 self.connect((self.gr_clock_recovery_mm_xx_0, 0), (self.gr_binary_slicer_fb_0, 0))
  59                 self.connect((self.gr_moving_average_xx_0, 0), (self.gr_clock_recovery_mm_xx_0, 0))
  60                 self.connect((self.pll, 0), (self.gr_moving_average_xx_0, 0))
  61                 self.connect((self.cs2cf, 0), (self.agc, 0))
  62                 self.connect((self.agc, 0), (self.pll, 0))
  63                 self.connect((self.noaa_hrpt_deframer_0, 0), (self.gr_file_sink_0, 0))
  64                 self.connect((self.noaa_hrpt_deframer_0, 0), (self.decoder, 0))
  65                 self.connect((self.gr_binary_slicer_fb_0, 0), (self.noaa_hrpt_deframer_0, 0))
  66
  67         def set_input_filename(self, input_filename):
  68                 self.input_filename = input_filename
  69
  70         def set_output_filename(self, output_filename):
  71                 self.output_filename = output_filename
  72
  73         def set_decim(self, decim):
  74                 self.decim = decim
  75                 self.set_sample_rate(64e6/self.decim)
  76
  77         def set_pll_alpha(self, pll_alpha):
  78                 self.pll_alpha = pll_alpha
  79                 self.pll.set_alpha(self.pll_alpha)
  80                 self.pll.set_beta(self.pll_alpha**2/4.0)
  81
  82         def set_clock_alpha(self, clock_alpha):
  83                 self.clock_alpha = clock_alpha
  84                 self.gr_clock_recovery_mm_xx_0.set_gain_omega(self.clock_alpha**2/4.0)
  85                 self.gr_clock_recovery_mm_xx_0.set_gain_mu(self.clock_alpha)
  86
  87         def set_sym_rate(self, sym_rate):
  88                 self.sym_rate = sym_rate
  89                 self.set_sps(self.sample_rate/self.sym_rate)
  90
  91         def set_sample_rate(self, sample_rate):
  92                 self.sample_rate = sample_rate
  93                 self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
  94                 self.set_sps(self.sample_rate/self.sym_rate)
  95
  96         def set_sps(self, sps):
  97                 self.sps = sps
  98                 self.set_hs(int(self.sps/2.0))
  99                 self.gr_clock_recovery_mm_xx_0.set_omega(self.sps/2.0)
 100
 101         def set_max_clock_offset(self, max_clock_offset):
 102                 self.max_clock_offset = max_clock_offset
 103
 104         def set_max_carrier_offset(self, max_carrier_offset):
 105                 self.max_carrier_offset = max_carrier_offset
 106                 self.pll.set_max_offset(self.max_carrier_offset)
 107
 108         def set_hs(self, hs):
 109                 self.hs = hs
 110                 self.gr_moving_average_xx_0.set_length_and_scale(self.hs, 1.0/self.hs)
 111
 112 if __name__ == '__main__':
 113         parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
 114         parser.add_option("-F", "--input-filename", dest="input_filename", type="string", default="usrp.dat",
 115                 help="Set usrp.dat [default=%default]")
 116         parser.add_option("-o", "--output-filename", dest="output_filename", type="string", default="frames.dat",
 117                 help="Set frames.dat [default=%default]")
 118         parser.add_option("-d", "--decim", dest="decim", type="intx", default=32,
 119                 help="Set decim [default=%default]")
 120         parser.add_option("-p", "--pll-alpha", dest="pll_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
 121                 help="Set pll_alpha [default=%default]")
 122         parser.add_option("-s", "--clock-alpha", dest="clock_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
 123                 help="Set clock_alpha [default=%default]")
 124         (options, args) = parser.parse_args()
 125         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)
 126         tb.run()
 127