mirror of https://gerrit.osmocom.org/osmo-tetra
add simdemod.py
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#!/usr/bin/env python
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# osmosdr-tetra_demod_fft.py Copyright 2012 Dimitri Stolnikov <horiz0n@gmx.net>
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# simdemod.py (c) 2014 Jacek Lipkowski <sq5bpf@lipkowski.org>
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# this is a modified osmosdr-tetra_demod_fft.py with all of the gui stuff
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# removed. is is intended to be fed from a receiver program via a pipe
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#
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# mkfifo /tmp/fifo1
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# demod/python/simdemod.py -o /dev/stdout -i /tmp/fifo1 | ./float_to_bits /dev/stdin /dev/stdout | ./tetra-rx /dev/stdin
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#
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import sys
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import math
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from gnuradio import gr, gru, eng_notation, blks2, optfir
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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import osmosdr
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try:
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import cqpsk
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except:
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from tetra_demod import cqpsk
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# applies frequency translation, resampling and demodulation
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class top_block(gr.top_block):
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def __init__(self):
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gr.top_block.__init__(self, "Top Block")
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options = get_options()
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self.input_file=options.input_file
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self.gr_file_source_0 = gr.file_source(gr.sizeof_gr_complex*1, self.input_file, True)
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symbol_rate = 18000
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sps = 2 # output rate will be 36,000
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out_sample_rate = symbol_rate * sps
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options.low_pass = options.low_pass / 2.0
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self.demod = cqpsk.cqpsk_demod(
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samples_per_symbol = sps,
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excess_bw=0.35,
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costas_alpha=0.03,
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gain_mu=0.05,
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mu=0.05,
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omega_relative_limit=0.05,
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log=options.log,
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verbose=options.verbose)
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self.output = gr.file_sink(gr.sizeof_float, options.output_file)
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self.connect(self.gr_file_source_0, self.demod, self.output)
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def get_options():
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parser = OptionParser(option_class=eng_option)
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# demodulator related settings
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parser.add_option("-l", "--log", action="store_true", default=False, help="dump debug .dat files")
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parser.add_option("-i", "--input-file", type="string", default="in.float", help="specify the bit input file")
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parser.add_option("-o", "--output-file", type="string", default="out.float", help="specify the bit output file")
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parser.add_option("-v", "--verbose", action="store_true", default=False, help="dump demodulation data")
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parser.add_option("-L", "--low-pass", type="eng_float", default=25e3, help="low pass cut-off", metavar="Hz")
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(options, args) = parser.parse_args()
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if len(args) != 0:
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parser.print_help()
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raise SystemExit, 1
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return (options)
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if __name__ == '__main__':
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tb = top_block()
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tb.run()
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#tb.run(True)
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#!/bin/sh
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# This is an example how to use simdemod.py --sq5bpf
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export TETRA_HACK_PORT=7379
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export TETRA_HACK_RXID=$1
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FIFO=/tmp/fifo$1
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mkfifo $FIFO
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ulimit -c unlimited
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demod/python/simdemod.py -o /dev/stdout -i $FIFO | ./float_to_bits /dev/stdin /dev/stdout | ./tetra-rx /dev/stdin
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#!/bin/sh
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# This is an example how to use simdemod.py --sq5bpf
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# this is receiver 1, only with the port changed, it will be used in the example documentation
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export TETRA_HACK_PORT=7380 #i might as well have made this a command line parameter, oh well :)
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export TETRA_HACK_RXID=$1
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FIFO=/tmp/fifo$1
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mkfifo $FIFO
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ulimit -c unlimited
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demod/python/simdemod.py -o /dev/stdout -i $FIFO | ./float_to_bits /dev/stdin /dev/stdout | ./tetra-rx /dev/stdin
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