169 lines
7.3 KiB
Python
Executable File
169 lines
7.3 KiB
Python
Executable File
#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# @file
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# @author (C) 2015 by Pieter Robyns <pieter.robyns@uhasselt.be>
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# @section LICENSE
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#
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# Gr-gsm is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# Gr-gsm is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gr-gsm; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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#
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##################################################
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# gr-gsm channelizer
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#
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# Standalone application to channelize a wideband
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# GSM capture file into multiple seperate capture
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# files for the specified ARFCNs.
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##################################################
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from gnuradio import blocks
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from gnuradio import eng_notation
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from gnuradio import filter
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from gnuradio import gr
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from gnuradio.eng_option import eng_option
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from gnuradio.filter import firdes
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from argparse import ArgumentParser, ArgumentTypeError, RawDescriptionHelpFormatter
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import grgsm.arfcn as arfcn
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from gnuradio.filter import pfb
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import math
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import os
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EXTRA_HELP = """
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Example usage:
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grgsm_channelize.py -c my_wideband_capture.cfile -f 925.2e6 990 991 992 993 994 995 1019 1020 1021 1022 1023
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The above example will channelize my_wideband_capture.cfile, in this case a cfile captured at
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925.2 MHz centered (ARFCN 975) and 2 Msps. As a result, 12 files will be generated for
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ARFCNs 975 - 1023 at 1 Msps each.
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"""
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def eng_float(value):
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try:
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return eng_notation.str_to_num(value)
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except:
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raise ArgumentTypeError("invalid engineering notation value: {0}".format(value))
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def gsm_band(value):
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choices = arfcn.get_bands()
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if value in choices:
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return value
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else:
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raise ArgumentTypeError("invalid GSM band: {0}. Possible choices are: {1}".format(value, choices))
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class grgsm_channelize(gr.top_block):
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def __init__(self, channels, resamp_rate, fc, band, samp_rate, input_file, dest_dir, data_type="complex"):
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gr.top_block.__init__(self, "grgsm_channelize")
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##################################################
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# Parameters
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##################################################
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self.channels = channels
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self.resamp_rate = resamp_rate
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self.fc = fc
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self.band = band
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self.samp_rate = samp_rate
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self.blocks_resamplers = {}
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self.blocks_rotators = {}
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self.blocks_file_sinks = {}
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##################################################
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# Blocks and connections
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##################################################
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self.source = None
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if data_type == "ishort":
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self.blocks_file_source = blocks.file_source(gr.sizeof_short, input_file, False)
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self.source = blocks.interleaved_short_to_complex(False, False)
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self.connect((self.blocks_file_source, 0), (self.source, 0))
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elif data_type == "complex":
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self.source = blocks.file_source(gr.sizeof_gr_complex, input_file, False)
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fc_str = eng_notation.num_to_str(fc)
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print("Extracting channels %s, given that the center frequency is at %s" % (str(channels), eng_notation.num_to_str(fc)))
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for channel in channels:
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channel_freq = arfcn.arfcn2downlink(channel, band)
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if channel_freq is None:
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print("Warning: invalid ARFCN %d for band %s" % (channel, band))
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continue
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freq_diff = channel_freq - fc
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freq_diff_str = "+" if 0 <= freq_diff else ""
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freq_diff_str += eng_notation.num_to_str(freq_diff)
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print("ARFCN %d is at %sHz %sHz" % (channel, fc_str, freq_diff_str))
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self.blocks_resamplers[channel] = pfb.arb_resampler_ccf( resamp_rate, taps=None, flt_size=32)
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self.blocks_rotators[channel] = blocks.rotator_cc(-2*math.pi*(freq_diff)/samp_rate)
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self.connect( (self.source, 0), (self.blocks_rotators[channel], 0) )
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self.connect( (self.blocks_rotators[channel], 0), (self.blocks_resamplers[channel], 0) )
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self.blocks_file_sinks[channel] = blocks.file_sink(gr.sizeof_gr_complex, dest_dir+"/out_" + str(channel) + ".cfile", False)
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self.blocks_file_sinks[channel].set_unbuffered(False)
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self.connect((self.blocks_resamplers[channel], 0), (self.blocks_file_sinks[channel], 0))
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if __name__ == '__main__':
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parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter, description='Split wideband a GSM capture into seperate files per ARFCN.', add_help=True, epilog=EXTRA_HELP)
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parser.add_argument(dest="channel", type=int, nargs='+',
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help="List of ARFCNs")
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parser.add_argument("-s", "--samp-rate", dest="samp_rate", type=eng_float, default=eng_notation.num_to_str(2e6),
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help="Sample rate of the wideband capture file [default=%(default)s]")
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parser.add_argument("-f", "--fc", dest="fc", type=eng_float, default=eng_notation.num_to_str(935e6), required=True,
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help="Carrier frequency in Hz [default=%(default)s]")
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parser.add_argument("-b", "--band", dest="band", type=gsm_band, default='E-GSM',
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help="GSM band [default=%(default)s]") #TODO: add automatic discovery based on fc
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parser.add_argument("-o", "--out-samp-rate", dest="out_samp_rate", type=eng_float, default=eng_notation.num_to_str(1e6),
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help="Sample rate of the output capture files [default=%(default)s]")
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parser.add_argument("-i", "--input_file", dest="input_file", type=str, required=True,
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help="Path to wideband GSM capture file")
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parser.add_argument("-t", "--data_type", dest="data_type", type=str, choices=["complex","ishort"], default="complex",
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help="Type of the input file [default=%(default)s]")
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parser.add_argument("-d", "--dest_dir", dest="dest_dir", type=str,
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help="Destination directory - if not given defaults to input file name without extension")
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args = parser.parse_args()
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if not os.path.exists(args.input_file):
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raise IOError(args.input_file + " does not exist")
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input_filename, _ = os.path.splitext(os.path.basename(args.input_file))
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if args.dest_dir is None:
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args.dest_dir = input_filename
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if not os.path.exists("./"+args.dest_dir):
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os.makedirs("./"+args.dest_dir)
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if args.samp_rate % args.out_samp_rate != 0:
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raise Exception("Input sample rate should be multiple of output sample rate in order to get integer decimation.")
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resamp_rate = args.out_samp_rate / args.samp_rate
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print("Input sample rate: " + eng_notation.num_to_str(args.samp_rate))
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print("Output sample rate: " + eng_notation.num_to_str(args.out_samp_rate))
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print("==> using resample rate of " + str(resamp_rate))
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tb = grgsm_channelize(channels=args.channel,
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resamp_rate=resamp_rate,
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fc=args.fc,
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band=args.band,
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samp_rate=args.samp_rate,
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input_file=args.input_file,
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dest_dir=args.dest_dir,
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data_type=args.data_type
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)
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tb.start()
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tb.wait()
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print("Done!")
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