2 ##################################################
3 # Gnuradio Python Flow Graph
5 # Generated: Sun Nov 8 10:41:08 2009
6 ##################################################
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
16 class hrpt_demod(gr.top_block):
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")
21 ##################################################
23 ##################################################
24 self.input_filename = input_filename
25 self.output_filename = output_filename
27 self.pll_alpha = pll_alpha
28 self.clock_alpha = clock_alpha
30 ##################################################
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)
40 ##################################################
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)
54 ##################################################
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))
67 def set_input_filename(self, input_filename):
68 self.input_filename = input_filename
70 def set_output_filename(self, output_filename):
71 self.output_filename = output_filename
73 def set_decim(self, decim):
75 self.set_sample_rate(64e6/self.decim)
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)
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)
87 def set_sym_rate(self, sym_rate):
88 self.sym_rate = sym_rate
89 self.set_sps(self.sample_rate/self.sym_rate)
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)
96 def set_sps(self, sps):
98 self.set_hs(int(self.sps/2.0))
99 self.gr_clock_recovery_mm_xx_0.set_omega(self.sps/2.0)
101 def set_max_clock_offset(self, max_clock_offset):
102 self.max_clock_offset = max_clock_offset
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)
108 def set_hs(self, hs):
110 self.gr_moving_average_xx_0.set_length_and_scale(self.hs, 1.0/self.hs)
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)