#!/usr/bin/env python # -*- coding: utf-8 -*- # @file # @author (C) 2015 by Roman Khassraf # @section LICENSE # # Gr-gsm is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3, or (at your option) # any later version. # # Gr-gsm is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with gr-gsm; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 51 Franklin Street, # Boston, MA 02110-1301, USA. # # from gnuradio import blocks from gnuradio import eng_notation from gnuradio import gr from gnuradio.eng_option import eng_option from gnuradio.filter import firdes from math import pi from optparse import OptionParser import grgsm import osmosdr import pmt import signal import sys class grgsm_capture(gr.top_block): def __init__(self, fc, gain, samp_rate, ppm, arfcn, cfile=None, burst_file=None, band=None, verbose=False, rec_length=None, args=""): gr.top_block.__init__(self, "Gr-gsm Capture") ################################################## # Parameters ################################################## self.fc = fc self.gain = gain self.samp_rate = samp_rate self.ppm = ppm self.arfcn = arfcn self.cfile = cfile self.burst_file = burst_file self.band = band self.verbose = verbose self.shiftoff = shiftoff = 400e3 self.rec_length = rec_length ################################################## # Processing Blocks ################################################## self.rtlsdr_source = osmosdr.source( args="numchan=" + str(1) + " " + args ) self.rtlsdr_source.set_sample_rate(samp_rate) self.rtlsdr_source.set_center_freq(fc - shiftoff, 0) self.rtlsdr_source.set_freq_corr(ppm, 0) self.rtlsdr_source.set_dc_offset_mode(2, 0) self.rtlsdr_source.set_iq_balance_mode(2, 0) self.rtlsdr_source.set_gain_mode(True, 0) self.rtlsdr_source.set_gain(gain, 0) self.rtlsdr_source.set_if_gain(20, 0) self.rtlsdr_source.set_bb_gain(20, 0) self.rtlsdr_source.set_antenna("", 0) self.rtlsdr_source.set_bandwidth(250e3+abs(shiftoff), 0) self.blocks_rotator = blocks.rotator_cc(-2*pi*shiftoff/samp_rate) if self.rec_length is not None: self.blocks_head_0 = blocks.head(gr.sizeof_gr_complex, int(samp_rate*rec_length)) if self.verbose or self.burst_file: self.gsm_receiver = grgsm.receiver(4, ([self.arfcn]), ([])) self.gsm_input = grgsm.gsm_input( ppm=0, osr=4, fc=fc, samp_rate_in=samp_rate, ) self.gsm_clock_offset_control = grgsm.clock_offset_control(fc-shiftoff, samp_rate, osr=4) if self.burst_file: self.gsm_burst_file_sink = grgsm.burst_file_sink(self.burst_file) if self.cfile: self.blocks_file_sink = blocks.file_sink(gr.sizeof_gr_complex*1, self.cfile, False) self.blocks_file_sink.set_unbuffered(False) if self.verbose: self.gsm_bursts_printer_0 = grgsm.bursts_printer(pmt.intern(""), False, False, False, False) ################################################## # Connections ################################################## if self.rec_length is not None: #if recording length is defined connect head block after the source self.connect((self.rtlsdr_source, 0), (self.blocks_head_0, 0)) self.connect((self.blocks_head_0, 0), (self.blocks_rotator, 0)) else: self.connect((self.rtlsdr_source, 0), (self.blocks_rotator, 0)) if self.cfile: self.connect((self.blocks_rotator, 0), (self.blocks_file_sink, 0)) if self.verbose or self.burst_file: self.connect((self.gsm_input, 0), (self.gsm_receiver, 0)) self.connect((self.blocks_rotator, 0), (self.gsm_input, 0)) self.msg_connect(self.gsm_clock_offset_control, "ctrl", self.gsm_input, "ctrl_in") self.msg_connect(self.gsm_receiver, "measurements", self.gsm_clock_offset_control, "measurements") if self.burst_file: self.msg_connect(self.gsm_receiver, "C0", self.gsm_burst_file_sink, "in") if self.verbose: self.msg_connect(self.gsm_receiver, "C0", self.gsm_bursts_printer_0, "bursts") def get_fc(self): return self.fc def set_fc(self, fc): self.fc = fc if self.verbose or self.burst_file: self.gsm_input.set_fc(self.fc) def get_arfcn(self): return self.arfcn def set_arfcn(self, arfcn): self.arfcn = arfcn if self.verbose or self.burst_file: self.gsm_receiver.set_cell_allocation([self.arfcn]) if options.band: new_freq = grgsm.arfcn.arfcn2downlink(self.arfcn, self.band) else: for band in grgsm.arfcn.get_bands(): if grgsm.arfcn.is_valid_arfcn(arfcn, band): new_freq = grgsm.arfcn.arfcn2downlink(arfcn, band) break self.set_fc(new_freq) def get_gain(self): return self.gain def set_gain(self, gain): self.gain = gain def get_samp_rate(self): return self.samp_rate def set_samp_rate(self, samp_rate): self.samp_rate = samp_rate self.rtlsdr_source.set_sample_rate(self.samp_rate) if self.verbose or self.burst_file: self.gsm_input.set_samp_rate_in(self.samp_rate) def get_ppm(self): return self.ppm def set_ppm(self, ppm): self.ppm = ppm self.set_ppm_slider(self.ppm) def get_rec_length(self): return self.rec_length def set_rec_length(self, rec_length): self.rec_length = rec_length self.blocks_head_0.set_length(int(self.samp_rate*self.rec_length)) if __name__ == '__main__': parser = OptionParser(option_class=eng_option, usage="%prog [options]", description="RTL-SDR capturing app of gr-gsm.") parser.add_option("-f", "--fc", dest="fc", type="eng_float", help="Set frequency [default=%default]") parser.add_option("-a", "--arfcn", dest="arfcn", type="intx", help="Set ARFCN instead of frequency. In some cases you may have to provide the GSM band also") parser.add_option("-g", "--gain", dest="gain", type="eng_float", default=eng_notation.num_to_str(30), help="Set gain [default=%default]") parser.add_option("-s", "--samp-rate", dest="samp_rate", type="eng_float", default=eng_notation.num_to_str(1000000), help="Set samp_rate [default=%default]") parser.add_option("-p", "--ppm", dest="ppm", type="intx", default=0, help="Set ppm [default=%default]") parser.add_option("-b", "--burst-file", dest="burst_file", help="File where the captured bursts are saved") parser.add_option("-c", "--cfile", dest="cfile", help="File where the captured data are saved") bands_list = ", ".join(grgsm.arfcn.get_bands()) parser.add_option("--band", dest="band", help="Specify the GSM band for the frequency.\nAvailable bands are: " + bands_list + ".\nIf no band is specified, it will be determined automatically, defaulting to 0." ) parser.add_option("", "--args", dest="args", type="string", default="", help="Set device arguments [default=%default]") parser.add_option("-v", "--verbose", action="store_true", help="If set, the captured bursts are printed to stdout") parser.add_option("-T", "--rec-length", dest="rec_length", type="eng_float", help="Set length of recording in seconds [default=%default]") (options, args) = parser.parse_args() if options.cfile is None and options.burst_file is None: parser.error("Please provide a cfile or a burst file (or both) to save the captured data\n") if (options.fc is None and options.arfcn is None) or (options.fc is not None and options.arfcn is not None): parser.error("You have to provide either a frequency or an ARFCN (but not both).\n") arfcn = 0 fc = 939.4e6 if options.arfcn: if options.band: if options.band not in grgsm.arfcn.get_bands(): parser.error("Invalid GSM band\n") elif not grgsm.arfcn.is_valid_arfcn(options.arfcn, options.band): parser.error("ARFCN is not valid in the specified band\n") else: arfcn = options.arfcn fc = grgsm.arfcn.arfcn2downlink(arfcn, options.band) else: arfcn = options.arfcn for band in grgsm.arfcn.get_bands(): if grgsm.arfcn.is_valid_arfcn(arfcn, band): fc = grgsm.arfcn.arfcn2downlink(arfcn, band) break elif options.fc: fc = options.fc if options.band: if options.band not in grgsm.arfcn.get_bands(): parser.error("Invalid GSM band\n") elif not grgsm.arfcn.is_valid_downlink(options.fc, options.band): parser.error("Frequency is not valid in the specified band\n") else: arfcn = grgsm.arfcn.downlink2arfcn(options.fc, options.band) else: for band in grgsm.arfcn.get_bands(): if grgsm.arfcn.is_valid_downlink(options.fc, band): arfcn = grgsm.arfcn.downlink2arfcn(options.fc, band) break tb = grgsm_capture(fc=fc, gain=options.gain, samp_rate=options.samp_rate, ppm=options.ppm, arfcn=arfcn, cfile=options.cfile, burst_file=options.burst_file, band=options.band, verbose=options.verbose, rec_length=options.rec_length, args=options.args) def signal_handler(signal, frame): tb.stop() tb.wait() sys.exit(0) signal.signal(signal.SIGINT, signal_handler) tb.start() tb.wait()