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#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: USRP HRPT Receiver
# Generated: Sun Sep 27 09:34:15 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, filename="usrp.dat", output="frames.dat", decim=16, pll_alpha=0.05, sync_alpha=0.05):
gr.top_block.__init__(self, "USRP HRPT Receiver")
##################################################
# Parameters
##################################################
self.filename = filename
self.output = output
self.decim = decim
self.pll_alpha = pll_alpha
self.sync_alpha = sync_alpha
##################################################
# Variables
##################################################
self.sym_rate = sym_rate = 600*1109
self.sample_rate = sample_rate = 64e6/decim
self.sps = sps = sample_rate/sym_rate
self.hs = hs = int(sps/2.0)
self.mf_taps = mf_taps = [-0.5/hs,]*hs+[0.5/hs,]*hs
self.max_sync_offset = max_sync_offset = 0.01
self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
##################################################
# 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.gr_fir_filter_xxx_0 = gr.fir_filter_ccc(1, (mf_taps))
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.deinterleave, 1), (self.f2c, 1))
self.connect((self.deinterleave, 0), (self.f2c, 0))
self.connect((self.deframer, 0), (self.decoder, 0))
self.connect((self.gr_fir_filter_xxx_0, 0), (self.pll, 0))
self.connect((self.f2c, 0), (self.gr_fir_filter_xxx_0, 0))
self.connect((self.s2f, 0), (self.deinterleave, 0))
self.connect((self.file_source, 0), (self.s2f, 0))
def set_filename(self, filename):
self.filename = filename
def set_output(self, output):
self.output = output
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_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_hs(self, hs):
self.hs = hs
self.set_mf_taps([-0.5/self.hs,]*self.hs+[0.5/self.hs,]*self.hs)
def set_mf_taps(self, mf_taps):
self.mf_taps = mf_taps
self.gr_fir_filter_xxx_0.set_taps((self.mf_taps))
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)
if __name__ == '__main__':
parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
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]")
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]")
(options, args) = parser.parse_args()
tb = demod_hrpt_file(filename=options.filename, output=options.output, decim=options.decim, pll_alpha=options.pll_alpha, sync_alpha=options.sync_alpha)
tb.start()
raw_input('Press Enter to quit: ')
tb.stop()
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