diff options
author | Piotr Krysik <ptrkrysik@gmail.com> | 2016-02-27 17:45:18 +0100 |
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committer | Piotr Krysik <ptrkrysik@gmail.com> | 2016-02-27 17:45:18 +0100 |
commit | 969c0ff52f8705298f35896a2cd19a3c826c19e9 (patch) | |
tree | 8b85f83154a070bd7e8ee11410f3657a7d18f6fc /apps | |
parent | 8c0f6fa539409dc59d72227deced96adce5b48b1 (diff) |
Changes and improvements of options in the grgsm_channelize.py
- replaced xlat_fir_filter with rotator and pfb arbitrary resampler,
- renamed some options,
- added new options
Diffstat (limited to 'apps')
-rwxr-xr-x | apps/helpers/grgsm_channelize.py | 93 |
1 files changed, 54 insertions, 39 deletions
diff --git a/apps/helpers/grgsm_channelize.py b/apps/helpers/grgsm_channelize.py index 4098b7b..04b1633 100755 --- a/apps/helpers/grgsm_channelize.py +++ b/apps/helpers/grgsm_channelize.py @@ -37,11 +37,13 @@ from gnuradio.eng_option import eng_option from gnuradio.filter import firdes from argparse import ArgumentParser, ArgumentTypeError, RawDescriptionHelpFormatter import grgsm.arfcn as arfcn +from gnuradio.filter import pfb +import math import os EXTRA_HELP = """ Example usage: -gsm_channelize.py -f my_wideband_capture.cfile -c 925.2e6 990 991 992 993 994 995 1019 1020 1021 1022 1023 +grgsm_channelize.py -f my_wideband_capture.cfile -c 925.2e6 990 991 992 993 994 995 1019 1020 1021 1022 1023 The above example will channelize my_wideband_capture.cfile, in this case a cfile captured at 925.2 MHz centered (ARFCN 975) and 20 Msps. As a result, 12 files will be generated for @@ -61,31 +63,34 @@ def gsm_band(value): else: raise ArgumentTypeError("invalid GSM band: {0}. Possible choices are: {1}".format(value, choices)) -class gsm_channelize(gr.top_block): - def __init__(self, channels, decim, ch_width, ch_twidth, fc, band, samp_rate, path): - gr.top_block.__init__(self, "gsm_channelize") +class grgsm_channelize(gr.top_block): + def __init__(self, channels, resamp_rate, fc, band, samp_rate, input_file, dest_dir, data_type="complex"): + gr.top_block.__init__(self, "grgsm_channelize") ################################################## # Parameters ################################################## self.channels = channels - self.decim = decim - self.ch_width = ch_width - self.ch_twidth = ch_twidth + self.resamp_rate = resamp_rate self.fc = fc self.band = band self.samp_rate = samp_rate - self.blocks_fir_filters = {} + self.blocks_resamplers = {} + self.blocks_rotators = {} self.blocks_file_sinks = {} - + ################################################## # Blocks and connections ################################################## - self.blocks_file_source = blocks.file_source(gr.sizeof_gr_complex, path, False) + self.source = None + if data_type == "ishort": + self.blocks_file_source = blocks.file_source(gr.sizeof_short, input_file, False) + self.source = blocks.interleaved_short_to_complex(False, False) + self.connect((self.blocks_file_source, 0), (self.source, 0)) + elif data_type == "complex": + self.source = blocks.file_source(gr.sizeof_gr_complex, input_file, False) - c0_arfcn = arfcn.downlink2arfcn(fc, band) - self.channels.insert(0, c0_arfcn) - print("Extracting channels %s, given that the center frequency is at ARFCN %d (%s)" % (str(channels), c0_arfcn, eng_notation.num_to_str(fc))) + print("Extracting channels %s, given that the center frequency is at %s" % (str(channels), eng_notation.num_to_str(fc))) for channel in channels: channel_freq = arfcn.arfcn2downlink(channel, band) @@ -93,58 +98,68 @@ class gsm_channelize(gr.top_block): print("Warning: invalid ARFCN %d for band %s" % (channel, band)) continue freq_diff = channel_freq - fc - print("ARFCN %d is at C0 %+d KHz" % (channel, int(freq_diff / 1000.0))) + print("ARFCN %d is at fc %+d KHz" % (channel, int(freq_diff / 1000.0))) - self.blocks_fir_filters[channel] = filter.freq_xlating_fir_filter_ccc(decim, (firdes.low_pass(1, samp_rate, ch_width, ch_twidth)), freq_diff, samp_rate) - self.connect((self.blocks_file_source, 0), (self.blocks_fir_filters[channel], 0)) + self.blocks_resamplers[channel] = pfb.arb_resampler_ccf( resamp_rate, taps=None, flt_size=32) + self.blocks_rotators[channel] = blocks.rotator_cc(-2*math.pi*(freq_diff)/samp_rate) + self.connect( (self.source, 0), (self.blocks_rotators[channel], 0) ) + self.connect( (self.blocks_rotators[channel], 0), (self.blocks_resamplers[channel], 0) ) - self.blocks_file_sinks[channel] = blocks.file_sink(gr.sizeof_gr_complex, "./gsm_channelizer/out_" + str(channel) + ".cfile", False) + self.blocks_file_sinks[channel] = blocks.file_sink(gr.sizeof_gr_complex, dest_dir+"/out_" + str(channel) + ".cfile", False) self.blocks_file_sinks[channel].set_unbuffered(False) - self.connect((self.blocks_fir_filters[channel], 0), (self.blocks_file_sinks[channel], 0)) + self.connect((self.blocks_resamplers[channel], 0), (self.blocks_file_sinks[channel], 0)) if __name__ == '__main__': - parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter, description='Split wideband a GSM capture into seperate files per ARFCN.', epilog=EXTRA_HELP) + parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter, description='Split wideband a GSM capture into seperate files per ARFCN.', add_help=True, epilog=EXTRA_HELP) parser.add_argument(dest="channel", type=int, nargs='+', help="List of ARFCNs") - parser.add_argument("-w", "--width", dest="width", type=eng_float, default=eng_notation.num_to_str(200000), - help="Channel lowpass width [default=%(default)s]") - parser.add_argument("-t", "--transition-width", dest="twidth", type=eng_float, default=eng_notation.num_to_str(50000), - help="Channel lowpass transition width [default=%(default)s]") parser.add_argument("-s", "--samp-rate", dest="samp_rate", type=eng_float, default=eng_notation.num_to_str(2e7), help="Sample rate of the wideband capture file [default=%(default)s]") + parser.add_argument("-f", "--fc", dest="fc", type=eng_float, default=eng_notation.num_to_str(935e6), required=True, + help="Carrier frequency in Hz [default=%(default)s]") + parser.add_argument("-b", "--band", dest="band", type=gsm_band, default='E-GSM', + help="GSM band [default=%(default)s]") #TODO: add automatic discovery based on fc parser.add_argument("-o", "--out-samp-rate", dest="out_samp_rate", type=eng_float, default=eng_notation.num_to_str(1e6), help="Sample rate of the output capture files [default=%(default)s]") - parser.add_argument("-b", "--band", dest="band", type=gsm_band, default='E-GSM', - help="GSM band [default=%(default)s]") - parser.add_argument("-f", "--cfile", dest="path", type=str, required=True, + parser.add_argument("-i", "--input_file", dest="input_file", type=str, required=True, help="Path to wideband GSM capture file") - parser.add_argument("-c", "--C0", dest="fc", type=eng_float, default=eng_notation.num_to_str(925.2e6), required=True, - help="C0 (BCCH) channel frequency in Hz [default=%(default)s]") + parser.add_argument("-t", "--data_type", dest="data_type", type=str, choices=["complex","ishort"], default="complex", + help="Type of the input file [default=%(default)s]") + parser.add_argument("-d", "--dest_dir", dest="dest_dir", type=str, + help="Destination directory - if not given defaults to input file name without extension") + args = parser.parse_args() + + if not os.path.exists(args.input_file): + raise IOError(args.input_file + " does not exist") + + input_filename, _ = os.path.splitext(os.path.basename(args.input_file)) - if not os.path.exists("./gsm_channelizer"): - os.makedirs("./gsm_channelizer") + if args.dest_dir is None: + args.dest_dir = input_filename + + if not os.path.exists("./"+args.dest_dir): + os.makedirs("./"+args.dest_dir) - if not os.path.exists(args.path): - raise IOError(args.path + " does not exist") if args.samp_rate % args.out_samp_rate != 0: raise Exception("Input sample rate should be multiple of output sample rate in order to get integer decimation.") - decim = int(args.samp_rate / args.out_samp_rate) + resamp_rate = args.out_samp_rate / args.samp_rate print("Input sample rate: " + eng_notation.num_to_str(args.samp_rate)) print("Output sample rate: " + eng_notation.num_to_str(args.out_samp_rate)) - print("==> using decimation of " + str(decim)) + print("==> using resample rate of " + str(resamp_rate)) - tb = gsm_channelize(channels=args.channel, - decim=decim, - ch_width=args.width, - ch_twidth=args.twidth, + tb = grgsm_channelize(channels=args.channel, + resamp_rate=resamp_rate, fc=args.fc, band=args.band, samp_rate=args.samp_rate, - path=args.path) + input_file=args.input_file, + dest_dir=args.dest_dir, + data_type=args.data_type + ) tb.start() tb.wait() print("Done!") |