#!/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()