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Diffstat (limited to 'gr-noaa/apps/hrpt_demod.py')
| -rwxr-xr-x | gr-noaa/apps/hrpt_demod.py | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/gr-noaa/apps/hrpt_demod.py b/gr-noaa/apps/hrpt_demod.py new file mode 100755 index 000000000..38d031686 --- /dev/null +++ b/gr-noaa/apps/hrpt_demod.py @@ -0,0 +1,127 @@ +#!/usr/bin/env python +################################################## +# Gnuradio Python Flow Graph +# Title: Hrpt Demod +# Generated: Sun Nov 8 10:41:08 2009 +################################################## + +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 = 64e6/decim + 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.agc = gr.agc_cc(1e-5, 1.0, 1.0/32768.0, 1.0) + self.cs2cf = gr.interleaved_short_to_complex() + self.decoder = noaa.hrpt_decoder(True,False) + self.file_source = gr.file_source(gr.sizeof_short*1, input_filename, False) + self.gr_binary_slicer_fb_0 = gr.binary_slicer_fb() + 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) + self.gr_file_sink_0 = gr.file_sink(gr.sizeof_short*1, output_filename) + self.gr_moving_average_xx_0 = gr.moving_average_ff(hs, 1.0/hs, 4000) + self.noaa_hrpt_deframer_0 = noaa.hrpt_deframer() + self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset) + + ################################################## + # Connections + ################################################## + self.connect((self.file_source, 0), (self.cs2cf, 0)) + self.connect((self.gr_clock_recovery_mm_xx_0, 0), (self.gr_binary_slicer_fb_0, 0)) + self.connect((self.gr_moving_average_xx_0, 0), (self.gr_clock_recovery_mm_xx_0, 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_binary_slicer_fb_0, 0), (self.noaa_hrpt_deframer_0, 0)) + + def set_input_filename(self, input_filename): + self.input_filename = input_filename + + def set_output_filename(self, output_filename): + self.output_filename = output_filename + + def set_decim(self, decim): + self.decim = decim + self.set_sample_rate(64e6/self.decim) + + 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 set_clock_alpha(self, clock_alpha): + self.clock_alpha = clock_alpha + self.gr_clock_recovery_mm_xx_0.set_gain_omega(self.clock_alpha**2/4.0) + self.gr_clock_recovery_mm_xx_0.set_gain_mu(self.clock_alpha) + + def set_sym_rate(self, sym_rate): + self.sym_rate = sym_rate + self.set_sps(self.sample_rate/self.sym_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 set_sps(self, sps): + self.sps = sps + self.set_hs(int(self.sps/2.0)) + self.gr_clock_recovery_mm_xx_0.set_omega(self.sps/2.0) + + def set_max_clock_offset(self, max_clock_offset): + self.max_clock_offset = max_clock_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 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 decim [default=%default]") + parser.add_option("-p", "--pll-alpha", dest="pll_alpha", type="eng_float", default=eng_notation.num_to_str(0.01), + help="Set pll_alpha [default=%default]") + parser.add_option("-s", "--clock-alpha", dest="clock_alpha", type="eng_float", default=eng_notation.num_to_str(0.01), + help="Set clock_alpha [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() + |