Hacking:Gsm receive rtl.py

#!/usr/bin/env python from gnuradio import gr, gru, blks2 #, gsm from gnuradio.eng_option import eng_option from optparse import OptionParser from os import sys for extdir in ['../../debug/src/lib','../../debug/src/lib/.libs','../lib','../lib/.libs']: if extdir not in sys.path: sys.path.append(extdir) import gsm class tuner(gr.feval_dd): def __init__(self, top_block): gr.feval_dd.__init__(self) self.top_block = top_block def eval(self, freq_offet): self.top_block.set_center_frequency(freq_offet) return freq_offet class synchronizer(gr.feval_dd): def __init__(self, top_block): gr.feval_dd.__init__(self) self.top_block = top_block def eval(self, timing_offset): self.top_block.set_timing(timing_offset) return freq_offet class gsm_receiver_first_blood(gr.top_block): def __init__(self): gr.top_block.__init__(self) (options, args) = self._process_options() self.tuner_callback = tuner(self) self.synchronizer_callback = synchronizer(self) self.options = options self.args = args self._set_rates() self.source = self._set_source() self.filtr = self._set_filter() self.interpolator = self._set_interpolator() self.receiver = self._set_receiver() self.converter = self._set_converter() self.sink = self._set_sink() self.connect(self.source, self.filtr, self.interpolator, self.receiver, self.converter, self.sink) def _set_sink(self): nazwa_pliku_wy = self.options.outputfile ujscie = gr.file_sink(gr.sizeof_float, nazwa_pliku_wy) return ujscie def _set_source(self): nazwa_pliku = self.options.inputfile zrodlo = gr.file_source(gr.sizeof_gr_complex, nazwa_pliku, False) return zrodlo def _set_rates(self): options = self.options clock_rate = 2285712 self.clock_rate = clock_rate self.input_rate = clock_rate / options.decim self.gsm_symb_rate = 1625000.0 / 6.0 self.sps = self.input_rate / self.gsm_symb_rate / self.options.osr def _set_filter(self): filter_cutoff = 145e3 filter_t_width = 10e3 offset = 0 print "input_rate:", self.input_rate, "sample rate:", self.sps, " filter_cutoff:", filter_cutoff, " filter_t_width:", filter_t_width filter_taps = gr.firdes.low_pass(1.0, self.input_rate, filter_cutoff, filter_t_width, gr.firdes.WIN_HAMMING) filtr = gr.freq_xlating_fir_filter_ccf(1, filter_taps, offset, self.input_rate) return filtr def _set_converter(self): v2s = gr.vector_to_stream(gr.sizeof_float, 142) return v2s def _set_interpolator(self): interpolator = gr.fractional_interpolator_cc(0, self.sps) return interpolator def _set_receiver(self): receiver = gsm.receiver_cf(self.tuner_callback, self.synchronizer_callback, self.options.osr, self.options.key.replace(' ', '').lower(), self.options.configuration.upper()) return receiver def _process_options(self): parser = OptionParser(option_class=eng_option) parser.add_option("-d", "--decim", type="int", default=128, help="Set USRP decimation rate to DECIM [default=%default]") parser.add_option("-r", "--osr", type="int", default=4, help="Oversampling ratio [default=%default]") parser.add_option("-I", "--inputfile", type="string", default="cfile", help="Input filename") parser.add_option("-O", "--outputfile", type="string", default="cfile2.out", help="Output filename") parser.add_option("-k", "--key", type="string", default="AD 6A 3E C2 B4 42 E4 00", help="KC session key") parser.add_option("-c", "--configuration", type="string", default="", help="Decoder configuration") (options, args) = parser.parse_args () return (options, args) def set_center_frequency(self, center_freq): self.filtr.set_center_freq(center_freq) def set_timing(self, timing_offset): pass def main(): try: gsm_receiver_first_blood().run() except KeyboardInterrupt: pass if __name__ == '__main__': main()