diff options
Diffstat (limited to 'gr-noaa/apps/demod_hrpt_file.py')
| -rwxr-xr-x | gr-noaa/apps/demod_hrpt_file.py | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/gr-noaa/apps/demod_hrpt_file.py b/gr-noaa/apps/demod_hrpt_file.py new file mode 100755 index 000000000..a1469e9e0 --- /dev/null +++ b/gr-noaa/apps/demod_hrpt_file.py @@ -0,0 +1,130 @@ +#!/usr/bin/env python +################################################## +# Gnuradio Python Flow Graph +# Title: USRP HRPT Receiver +# Generated: Wed Sep 23 11:37:25 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 + +class demod_hrpt_file(gr.top_block): + + def __init__(self, decim=16, pll_alpha=0.05, sync_alpha=0.05, filename="usrp.dat", output="frames.dat"): + gr.top_block.__init__(self, "USRP HRPT Receiver") + + ################################################## + # Parameters + ################################################## + self.decim = decim + self.pll_alpha = pll_alpha + self.sync_alpha = sync_alpha + self.filename = filename + self.output = output + + ################################################## + # Variables + ################################################## + self.sym_rate = sym_rate = 600*1109 + self.sample_rate = sample_rate = 64e6/decim + self.sps = sps = sample_rate/sym_rate + self.max_sync_offset = max_sync_offset = 0.01 + self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate + self.hs = hs = int(sps/2.0) + + ################################################## + # Blocks + ################################################## + self.decoder = noaa.hrpt_decoder() + self.deframer = noaa.hrpt_deframer() + self.deinterleave = gr.deinterleave(gr.sizeof_float*1) + self.f2c = gr.float_to_complex(1) + self.file_sink = gr.file_sink(gr.sizeof_short*1, output) + self.file_source = gr.file_source(gr.sizeof_short*1, filename, False) + self.matched_filter = gr.moving_average_cc(hs, 1.0/hs, 4000) + self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset) + self.s2f = gr.short_to_float() + self.sync = noaa.hrpt_sync_fb(sync_alpha, sync_alpha**2/4.0, sps, max_sync_offset) + + ################################################## + # Connections + ################################################## + self.connect((self.deframer, 0), (self.file_sink, 0)) + self.connect((self.sync, 0), (self.deframer, 0)) + self.connect((self.pll, 0), (self.sync, 0)) + self.connect((self.matched_filter, 0), (self.pll, 0)) + self.connect((self.s2f, 0), (self.deinterleave, 0)) + self.connect((self.deinterleave, 1), (self.f2c, 1)) + self.connect((self.deinterleave, 0), (self.f2c, 0)) + self.connect((self.file_source, 0), (self.s2f, 0)) + self.connect((self.deframer, 0), (self.decoder, 0)) + self.connect((self.f2c, 0), (self.matched_filter, 0)) + + 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_sync_alpha(self, sync_alpha): + self.sync_alpha = sync_alpha + self.sync.set_alpha(self.sync_alpha) + self.sync.set_beta(self.sync_alpha**2/4.0) + + def set_filename(self, filename): + self.filename = filename + + def set_output(self, output): + self.output = output + + 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)) + + def set_max_sync_offset(self, max_sync_offset): + self.max_sync_offset = max_sync_offset + self.sync.set_max_offset(self.max_sync_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.matched_filter.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("-d", "--decim", dest="decim", type="intx", default=16, + help="Set Decimation [default=%default]") + parser.add_option("-p", "--pll-alpha", dest="pll_alpha", type="eng_float", default=eng_notation.num_to_str(0.05), + help="Set pll_alpha [default=%default]") + parser.add_option("-s", "--sync-alpha", dest="sync_alpha", type="eng_float", default=eng_notation.num_to_str(0.05), + help="Set sync_alpha [default=%default]") + parser.add_option("-F", "--filename", dest="filename", type="string", default="usrp.dat", + help="Set Filename [default=%default]") + parser.add_option("-o", "--output", dest="output", type="string", default="frames.dat", + help="Set Output [default=%default]") + (options, args) = parser.parse_args() + tb = demod_hrpt_file(decim=options.decim, pll_alpha=options.pll_alpha, sync_alpha=options.sync_alpha, filename=options.filename, output=options.output) + tb.start() + raw_input('Press Enter to quit: ') + tb.stop() + |