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

   1 #!/usr/bin/env python
   2 ##################################################
   3 # Gnuradio Python Flow Graph
   4 # Title: USRP HRPT Receiver
   5 # Generated: Wed Sep 23 11:37:25 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
  15
  16 class demod_hrpt_file(gr.top_block):
  17
  18         def __init__(self, decim=16, pll_alpha=0.05, sync_alpha=0.05, filename="usrp.dat", output="frames.dat"):
  19                 gr.top_block.__init__(self, "USRP HRPT Receiver")
  20
  21                 ##################################################
  22                 # Parameters
  23                 ##################################################
  24                 self.decim = decim
  25                 self.pll_alpha = pll_alpha
  26                 self.sync_alpha = sync_alpha
  27                 self.filename = filename
  28                 self.output = output
  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_sync_offset = max_sync_offset = 0.01
  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.decoder = noaa.hrpt_decoder()
  44                 self.deframer = noaa.hrpt_deframer()
  45                 self.deinterleave = gr.deinterleave(gr.sizeof_float*1)
  46                 self.f2c = gr.float_to_complex(1)
  47                 self.file_sink = gr.file_sink(gr.sizeof_short*1, output)
  48                 self.file_source = gr.file_source(gr.sizeof_short*1, filename, False)
  49                 self.matched_filter = gr.moving_average_cc(hs, 1.0/hs, 4000)
  50                 self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset)
  51                 self.s2f = gr.short_to_float()
  52                 self.sync = noaa.hrpt_sync_fb(sync_alpha, sync_alpha**2/4.0, sps, max_sync_offset)
  53
  54                 ##################################################
  55                 # Connections
  56                 ##################################################
  57                 self.connect((self.deframer, 0), (self.file_sink, 0))
  58                 self.connect((self.sync, 0), (self.deframer, 0))
  59                 self.connect((self.pll, 0), (self.sync, 0))
  60                 self.connect((self.matched_filter, 0), (self.pll, 0))
  61                 self.connect((self.s2f, 0), (self.deinterleave, 0))
  62                 self.connect((self.deinterleave, 1), (self.f2c, 1))
  63                 self.connect((self.deinterleave, 0), (self.f2c, 0))
  64                 self.connect((self.file_source, 0), (self.s2f, 0))
  65                 self.connect((self.deframer, 0), (self.decoder, 0))
  66                 self.connect((self.f2c, 0), (self.matched_filter, 0))
  67
  68         def set_decim(self, decim):
  69                 self.decim = decim
  70                 self.set_sample_rate(64e6/self.decim)
  71
  72         def set_pll_alpha(self, pll_alpha):
  73                 self.pll_alpha = pll_alpha
  74                 self.pll.set_alpha(self.pll_alpha)
  75                 self.pll.set_beta(self.pll_alpha**2/4.0)
  76
  77         def set_sync_alpha(self, sync_alpha):
  78                 self.sync_alpha = sync_alpha
  79                 self.sync.set_alpha(self.sync_alpha)
  80                 self.sync.set_beta(self.sync_alpha**2/4.0)
  81
  82         def set_filename(self, filename):
  83                 self.filename = filename
  84
  85         def set_output(self, output):
  86                 self.output = output
  87
  88         def set_sym_rate(self, sym_rate):
  89                 self.sym_rate = sym_rate
  90                 self.set_sps(self.sample_rate/self.sym_rate)
  91
  92         def set_sample_rate(self, sample_rate):
  93                 self.sample_rate = sample_rate
  94                 self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
  95                 self.set_sps(self.sample_rate/self.sym_rate)
  96
  97         def set_sps(self, sps):
  98                 self.sps = sps
  99                 self.set_hs(int(self.sps/2.0))
 100
 101         def set_max_sync_offset(self, max_sync_offset):
 102                 self.max_sync_offset = max_sync_offset
 103                 self.sync.set_max_offset(self.max_sync_offset)
 104
 105         def set_max_carrier_offset(self, max_carrier_offset):
 106                 self.max_carrier_offset = max_carrier_offset
 107                 self.pll.set_max_offset(self.max_carrier_offset)
 108
 109         def set_hs(self, hs):
 110                 self.hs = hs
 111                 self.matched_filter.set_length_and_scale(self.hs, 1.0/self.hs)
 112
 113 if __name__ == '__main__':
 114         parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
 115         parser.add_option("-d", "--decim", dest="decim", type="intx", default=16,
 116                 help="Set Decimation [default=%default]")
 117         parser.add_option("-p", "--pll-alpha", dest="pll_alpha", type="eng_float", default=eng_notation.num_to_str(0.05),
 118                 help="Set pll_alpha [default=%default]")
 119         parser.add_option("-s", "--sync-alpha", dest="sync_alpha", type="eng_float", default=eng_notation.num_to_str(0.05),
 120                 help="Set sync_alpha [default=%default]")
 121         parser.add_option("-F", "--filename", dest="filename", type="string", default="usrp.dat",
 122                 help="Set Filename [default=%default]")
 123         parser.add_option("-o", "--output", dest="output", type="string", default="frames.dat",
 124                 help="Set Output [default=%default]")
 125         (options, args) = parser.parse_args()
 126         tb = demod_hrpt_file(decim=options.decim, pll_alpha=options.pll_alpha, sync_alpha=options.sync_alpha, filename=options.filename, output=options.output)
 127         tb.start()
 128         raw_input('Press Enter to quit: ')
 129         tb.stop()
 130