├── COPYING ├── README.md ├── pocsag-mrt.py ├── pocsag-mrt_demodsink.ui ├── pocsag-mrt_main.ui ├── pocsag-mrt_srcsink.ui └── pocsag.py /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | pocsag-mrt 2 | ========== 3 | 4 | POCSAG Multichannel Realtime Decoder 5 | 6 | Copyright (c) 2012 iZsh - izsh at fail0verflow.com 7 | 8 | License Information 9 | ===================== 10 | This program is free software: you can redistribute it and/or modify 11 | it under the terms of the GNU General Public License as published by 12 | the Free Software Foundation, either version 3 of the License, or 13 | (at your option) any later version. 14 | 15 | This program is distributed in the hope that it will be useful, 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 | GNU General Public License for more details. 19 | 20 | You should have received a copy of the GNU General Public License 21 | along with this program. If not, see . 22 | 23 | Notes 24 | ========= 25 | The usage should be self-expanatory. 26 | 27 | You can either read the samples from a file or from an GrOsmoSDR compatible 28 | device (USRP, FunCube dongle, RTL-based devices etc.) 29 | 30 | If you read the sample from a RTL-sdr device, make sure you offset your 31 | center frequency from the channel frequencies you read (to prevent from 32 | the "DC effect"). 33 | 34 | In the GUI: 35 | - you can enter multiple channel frequencies to simultaneously decode them. 36 | - to visualize a given channel using the QT sinks you just select it from 37 | the list. 38 | - you can remove a given channel by selecting it and pressing the backspace key 39 | - you can adjust the center frequency at any time 40 | 41 | When starting the software from the command line, you can specify many default 42 | arguments. One of particular interest is the '-C/--channelsfile' option: 43 | it enables you to pre-load at startup, one frequency per line (engineering 44 | notation accepted), a list of channel frequencies to monitor. 45 | 46 | GNURadio 47 | ========== 48 | The application was tested with gnuradio 3.6.2 but a lower version might work. 49 | It also (mainly) depends on: 50 | - GrExtras: https://github.com/guruofquality/grextras/wiki 51 | - GrOsmoSDR: http://sdr.osmocom.org/trac/wiki/GrOsmoSDR 52 | - PyQt4 53 | - Python 2.7 (gnuradio doesn't work with Python 3.x) 54 | 55 | It tries to use as much as possible the "new" features (e.g. message passing 56 | and gnuradio blocks are implemented entirely in Python) to ease the prototyping 57 | and developement and to show that C++ is not always a mandatory evil with 58 | gnuradio. 59 | 60 | A special note for MacOS X users/developers: 61 | to compile gnuradio without hitting the annoying python "mismatched version" 62 | crash (when running gnuradio-company for instance), use the following command 63 | line (assuming you are using macports for most dependencies): 64 | 65 | % mkdir build 66 | % cd build 67 | % cmake -DCMAKE_INSTALL_PREFIX:PATH=/opt/local -DPYTHON_INCLUDE_DIR=/opt/local/Library/Frameworks/Python.framework/Versions/2.7/Headers -DPYTHON_LIBRARY=/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib .. 68 | 69 | Usage 70 | ========= 71 | 72 | POCSAG Multichannel Realtime Decoder -- iZsh (izsh at fail0verflow.com) 73 | usage: pocsag-mrt.py [-h] [-i INPUT_FILE] [-l] [-o OUTPUT_FILE] [-c FREQCORR] 74 | [-f CENTERFREQ] [-r SAMPLERATE] [-s SYMRATE] 75 | [-C CHANNELS_FILE] 76 | 77 | optional arguments: 78 | -h, --help show this help message and exit 79 | -i INPUT_FILE, --input INPUT_FILE 80 | read the samples from a file (default: None) 81 | -l, --loop when reading from a file, loop the samples (default: 82 | false) 83 | -o OUTPUT_FILE, --output OUTPUT_FILE 84 | save the samples to a file (default: None) 85 | -c FREQCORR, --freqcorr FREQCORR 86 | set the frequency correction (ppm) (default: 0.0) 87 | -f CENTERFREQ, --freq CENTERFREQ 88 | set the center frequency (default: 0.0) 89 | -r SAMPLERATE, --samplerate SAMPLERATE 90 | set the samplerate (default: 1000000.0) 91 | -s SYMRATE, --symrate SYMRATE 92 | set the symbol rate (default: 1200) 93 | -C CHANNELS_FILE, --channelsfile CHANNELS_FILE 94 | read an initial channels list from a file (default: 95 | None) 96 | 97 | POCSAG 98 | ======== 99 | - http://en.wikipedia.org/wiki/POCSAG 100 | - CCIR Recommendation R-584-1 / Rec. ITU-R M.584-2: 101 | http://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.584-2-199711-I!!PDF-E.pdf 102 | -------------------------------------------------------------------------------- /pocsag-mrt.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | 3 | # POCSAG Multichannel Realtime Decoder 4 | # Copyright (c) 2012 iZsh -- izsh at fail0verflow.com 5 | # 6 | # This program is free software: you can redistribute it and/or modify 7 | # it under the terms of the GNU General Public License as published by 8 | # the Free Software Foundation, either version 3 of the License, or 9 | # (at your option) any later version. 10 | # 11 | # This program is distributed in the hope that it will be useful, 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | # GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | from gruel import pmt 19 | from gnuradio import gr 20 | from gnuradio import extras 21 | from gnuradio import eng_notation 22 | from gnuradio.eng_option import eng_option 23 | import sys 24 | import time 25 | import argparse 26 | import osmosdr 27 | import pocsag 28 | 29 | try: 30 | from gnuradio import qtgui 31 | from PyQt4 import QtGui, QtCore, uic 32 | import sip 33 | except ImportError: 34 | print "Error: Program requires PyQt4 and gr-qtgui." 35 | sys.exit(1) 36 | 37 | BANNER = "POCSAG Multichannel Realtime Decoder -- iZsh (izsh at fail0verflow.com)" 38 | 39 | INI_FREQ_CORR = 0.0 40 | INI_FREQ= 0.0 41 | INI_SAMPLERATE = 1e6 42 | INI_SYMRATE = 1200 43 | SPS = 8 # signal per symbol 44 | 45 | FFTSIZE = 2048 46 | XLATING_CUTOFF = 10e3 47 | 48 | class pocsag_msgsink(gr.block, QtCore.QObject): 49 | 50 | pocsag_pagermsg = QtCore.pyqtSignal(dict) 51 | 52 | def __init__(self): 53 | gr.block.__init__( 54 | self, 55 | name = "POCSAG message sink", 56 | in_sig = None, 57 | out_sig = None, 58 | has_msg_input = True 59 | ) 60 | QtCore.QObject.__init__(self) 61 | 62 | def work(self, input_items, output_items): 63 | try: 64 | msg = self.pop_msg_queue() 65 | key = pmt.pmt_symbol_to_string(msg.key) 66 | txt = pmt.to_python(msg.value) 67 | if key == pocsag.POCSAG_ID: 68 | self.pocsag_pagermsg.emit(txt) 69 | return 1 70 | return 0 71 | except: 72 | return -1 73 | 74 | # We can't derive from extras.stream_selector... hence the ugly workaround 75 | class stream_selector: 76 | def __init__(self, num_inputs, size_of_items): 77 | self.ss = extras.stream_selector(gr.io_signature(num_inputs, num_inputs, size_of_items), 78 | gr.io_signature(1, 1, size_of_items)) 79 | self.num_inputs = num_inputs 80 | def set_output(self, n): 81 | p = [-2] * self.num_inputs 82 | p[n] = 0 83 | self.ss.set_paths(p) 84 | 85 | class main_window(QtGui.QMainWindow): 86 | 87 | backspacepressed = QtCore.pyqtSignal() 88 | 89 | def __init__(self, topblock, args): 90 | QtGui.QMainWindow.__init__(self) 91 | 92 | uic.loadUi('pocsag-mrt_main.ui', self) 93 | self.srcsink = uic.loadUi('pocsag-mrt_srcsink.ui') 94 | self.demodsink = uic.loadUi('pocsag-mrt_demodsink.ui') 95 | 96 | self.topblock = topblock 97 | self.args = args 98 | self.push_text(BANNER, QtCore.Qt.magenta) 99 | 100 | self.init_sink() 101 | 102 | # Connect the signals/slots etc. 103 | self.freq_list.installEventFilter(self) 104 | self.srcsink.installEventFilter(self) 105 | self.demodsink.installEventFilter(self) 106 | self.installEventFilter(self) 107 | self.centerfreq_edit.returnPressed.connect(self.centerfreq_edittext) 108 | self.addfreq_edit.returnPressed.connect(self.addfreq_edittext) 109 | self.symrate_edit.returnPressed.connect(self.symrate_edittext) 110 | self.samplerate_edit.returnPressed.connect(self.samplerate_edittext) 111 | self.freqcorr_edit.returnPressed.connect(self.freqcorr_edittext) 112 | self.freq_list.itemSelectionChanged.connect(self.select_freq) 113 | self.backspacepressed.connect(self.remove_selected_freq) 114 | self.debug_check.stateChanged.connect(self.debug_state) 115 | self.srcsink_check.stateChanged.connect(self.srcsink_state) 116 | self.demodsink_check.stateChanged.connect(self.demodsink_state) 117 | # General inits 118 | self.selected_freq = None 119 | self.freqs = dict() 120 | self.set_freqcorr(self.topblock.source.get_freq_corr()) 121 | self.set_samplerate(self.topblock.source.get_sample_rate()) 122 | self.set_centerfreq(self.topblock.source.get_center_freq()) 123 | self.symrate_edit.setText("%d" % self.args.symrate) 124 | self.symrate = float(self.args.symrate) 125 | self.read_channels(args.channels_file) 126 | 127 | def init_sink(self): 128 | self.topblock.stop() 129 | self.topblock.wait() 130 | self.enable_selector_buttons(False) 131 | # 132 | # Source/premodulation 133 | # 134 | # Create the selector and connect the source to it 135 | self.sel_c = stream_selector(3, gr.sizeof_gr_complex) 136 | self.topblock.connect(self.topblock.source, (self.sel_c.ss, 0)) 137 | self.srcsink.source_source_radio.setEnabled(True) 138 | self.sel_c.set_output(0) 139 | # Add the sink 140 | self.srcsink.grsink = qtgui.sink_c(FFTSIZE, gr.firdes.WIN_BLACKMAN_hARRIS, 141 | self.topblock.source.get_center_freq(), self.topblock.source.get_sample_rate(), 142 | "Source Signal", True, True, True, False) 143 | self.srcsink.grsink.set_update_time(0.1) 144 | self.topblock.connect(self.sel_c.ss, self.srcsink.grsink) 145 | self.srcsink.sink = sip.wrapinstance(self.srcsink.grsink.pyqwidget(), QtGui.QWidget) 146 | self.srcsink.horizontalLayout.addWidget(self.srcsink.sink) 147 | # add a button group for the radio buttons 148 | self.waveselc = QtGui.QButtonGroup(self.srcsink.verticalLayout) 149 | self.waveselc.addButton(self.srcsink.source_source_radio, 0) 150 | self.waveselc.addButton(self.srcsink.source_xlating_radio, 1) 151 | self.waveselc.addButton(self.srcsink.source_interpolator_radio, 2) 152 | self.waveselc.buttonClicked[int].connect(self.waveselc_toggled) 153 | self.srcsink.source_source_radio.setChecked(True) 154 | # 155 | # Demodulation 156 | # 157 | # Add the sink 158 | self.sel_f = stream_selector(4, gr.sizeof_float) 159 | self.sel_f.set_output(0) 160 | self.demodsink.grsink = qtgui.sink_f(FFTSIZE, gr.firdes.WIN_BLACKMAN_hARRIS, 161 | 0, self.args.symrate * SPS, "Demodulated Signal", True, True, True, False) 162 | self.demodsink.grsink.set_update_time(0.1) 163 | self.topblock.connect(self.sel_f.ss, self.demodsink.grsink) 164 | self.demodsink.sink = sip.wrapinstance(self.demodsink.grsink.pyqwidget(), QtGui.QWidget) 165 | self.demodsink.horizontalLayout.addWidget(self.demodsink.sink) 166 | # Add the button group 167 | self.waveself = QtGui.QButtonGroup(self.demodsink.verticalLayout) 168 | self.waveself.addButton(self.demodsink.demodulation_quaddemod_radio, 0) 169 | self.waveself.addButton(self.demodsink.demodulation_lowpass_radio, 1) 170 | self.waveself.addButton(self.demodsink.demodulation_clockrecovery_radio, 2) 171 | self.waveself.addButton(self.demodsink.demodulation_bits_radio, 3) 172 | self.waveself.buttonClicked[int].connect(self.waveself_toggled) 173 | self.demodsink.demodulation_quaddemod_radio.setChecked(True) 174 | # 175 | self.topblock.start() 176 | 177 | def read_channels(self, channels_file): 178 | if not channels_file: return 179 | for freq in channels_file.readlines(): 180 | self.addfreq(eng_notation.str_to_num(freq.strip())) 181 | 182 | def eventFilter(self, watched, event): 183 | if event.type() == QtCore.QEvent.KeyPress and event.key() == QtCore.Qt.Key_Backspace: 184 | self.backspacepressed.emit() 185 | return True 186 | if event.type() == QtCore.QEvent.Close and watched == self.srcsink: 187 | self.srcsink_check.setCheckState(QtCore.Qt.Unchecked) 188 | return True 189 | if event.type() == QtCore.QEvent.Close and watched == self.demodsink: 190 | self.demodsink_check.setCheckState(QtCore.Qt.Unchecked) 191 | return True 192 | if event.type() == QtCore.QEvent.Close and watched == self: 193 | self.srcsink_check.setCheckState(QtCore.Qt.Unchecked) 194 | self.demodsink_check.setCheckState(QtCore.Qt.Unchecked) 195 | # Keep processing the event, we want to close the app 196 | return False 197 | 198 | def enable_selector_buttons(self, enabled = True): 199 | # We never disable the source button 200 | self.srcsink.source_xlating_radio.setEnabled(enabled) 201 | self.srcsink.source_interpolator_radio.setEnabled(enabled) 202 | self.demodsink.demodulation_quaddemod_radio.setEnabled(enabled) 203 | self.demodsink.demodulation_lowpass_radio.setEnabled(enabled) 204 | self.demodsink.demodulation_clockrecovery_radio.setEnabled(enabled) 205 | self.demodsink.demodulation_bits_radio.setEnabled(enabled) 206 | 207 | def waveselc_toggled(self, Id): 208 | self.sel_c.set_output(Id) 209 | self.set_uisink_frequency_range() 210 | 211 | def waveself_toggled(self, Id): 212 | self.sel_f.set_output(Id) 213 | self.set_uisink_frequency_range() 214 | 215 | def push_text(self, text, color = QtCore.Qt.black): 216 | self.console.setTextColor(color) 217 | self.console.append(text) 218 | 219 | def push_pagermsg(self, txt): 220 | ch = "N/A" if txt["channel"] == None else txt["channel"] 221 | pagertext = "Pager message -- Channel %s, From pager %d (%d), TXT: %s" % (ch, txt["addr"], txt["fun"], txt["text"]) 222 | if txt["endofmsg"]: 223 | self.push_text(pagertext, QtCore.Qt.blue) 224 | else: 225 | self.push_text(pagertext, QtCore.Qt.red) 226 | 227 | def set_uisink_frequency_range(self): 228 | if not hasattr(self, 'freq') or not hasattr(self, 'freqshift') or not hasattr(self, 'samplerate'): 229 | return 230 | if self.waveselc.checkedId() == 0: # the source 231 | self.srcsink.grsink.set_frequency_range(self.centerfreq, self.samplerate) 232 | elif self.waveselc.checkedId() == 1: # the shifted frequency 233 | self.srcsink.grsink.set_frequency_range(self.centerfreq + self.freqshift, self.samplerate) 234 | elif self.waveselc.checkedId() == 2: # interpolated/decimated 235 | self.srcsink.grsink.set_frequency_range(self.centerfreq + self.freqshift, self.symrate * SPS) 236 | if self.waveself.checkedId() == 0: # quad demod 237 | self.demodsink.grsink.set_frequency_range(0, self.symrate * SPS) 238 | elif self.waveself.checkedId() == 1: # lowpass 239 | self.demodsink.grsink.set_frequency_range(0, self.symrate * SPS) 240 | elif self.waveself.checkedId() == 2: # clock recovery 241 | self.demodsink.grsink.set_frequency_range(0, self.symrate) 242 | elif self.waveself.checkedId() == 3: # bits 243 | self.demodsink.grsink.set_frequency_range(0, self.symrate) 244 | 245 | def set_centerfreq(self, freq): 246 | self.centerfreq = freq 247 | self.centerfreq_edit.setText("%.3fM" % (self.centerfreq / 1e6)) 248 | self.push_text("Setting center frequency to %.3fMhz" % (self.centerfreq / 1e6)) 249 | self.update_freqs() 250 | self.topblock.source.set_center_freq(self.centerfreq) 251 | self.set_uisink_frequency_range() 252 | 253 | def update_freqs(self): 254 | for freq_txt, values in self.freqs.items(): 255 | if abs(self.centerfreq - values["freq"]) > self.samplerate / 2.0: 256 | self.push_text("%s is outside of the bandwidth reach!" % freq_txt) 257 | self.remove_freq(freq_txt) 258 | 259 | def addfreq(self, freq): 260 | self.addfreq_edit.clearFocus() 261 | self.addfreq_edit.clear() 262 | freq_txt = "%.6fMHz" % (freq / 1e6) 263 | if freq_txt in self.freqs: 264 | self.push_text("%s is already monitored!" % freq_txt) 265 | return 266 | if abs(self.centerfreq - freq) > self.samplerate / 2.0: 267 | self.push_text("%s is outside of the bandwidth reach!" % freq_txt) 268 | return 269 | self.push_text("Monitoring %s" % freq_txt) 270 | freqshift = self.centerfreq - freq 271 | # reconfigure the flowgraph 272 | # We use stop()/wait() because lock()/unlock() seems to freeze the app 273 | # Can't find the reason... 274 | self.topblock.stop() 275 | self.topblock.wait() 276 | # self.topblock.lock() 277 | freq_xlating_fir_filter = gr.freq_xlating_fir_filter_ccc(1, (gr.firdes.low_pass(1.0, self.samplerate, XLATING_CUTOFF, XLATING_CUTOFF / 2)), freqshift, self.samplerate) 278 | pocsag_decoder = pocsag.pocsag_decoder(self.samplerate, channel_str = freq_txt, symbolrate = self.symrate, debug = self.debug_check.isChecked()) 279 | msgsink = pocsag_msgsink() # FIXME: Shouldn't we use only one general msgsink? 280 | self.topblock.connect(self.topblock.source, freq_xlating_fir_filter, pocsag_decoder, msgsink) 281 | # Connect the QT signal from the msgsink to the UI 282 | msgsink.pocsag_pagermsg.connect(self.push_pagermsg) 283 | # self.topblock.unlock() 284 | self.topblock.start() 285 | # Save the blocks 286 | self.freqs[freq_txt] = { 287 | "freq": freq, 288 | "freq_xlating_fir_filter": freq_xlating_fir_filter, 289 | "pocsag_decoder": pocsag_decoder, 290 | "msgsink": msgsink, 291 | "uchar2float": gr.uchar_to_float() # we need a converter to connect it to the qtsink 292 | } 293 | self.freq_list.addItem(freq_txt) 294 | 295 | def disconnect_sink(self, freq): 296 | self.topblock.disconnect(self.freqs[freq]["freq_xlating_fir_filter"], (self.sel_c.ss, 1)) 297 | self.topblock.disconnect(self.freqs[freq]["pocsag_decoder"].fractional_interpolator, (self.sel_c.ss, 2)) 298 | self.topblock.disconnect(self.freqs[freq]["pocsag_decoder"].quadrature_demod, (self.sel_f.ss, 0)) 299 | self.topblock.disconnect(self.freqs[freq]["pocsag_decoder"].low_pass_filter, (self.sel_f.ss, 1)) 300 | self.topblock.disconnect(self.freqs[freq]["pocsag_decoder"].digital_clock_recovery_mm, (self.sel_f.ss, 2)) 301 | self.topblock.disconnect(self.freqs[freq]["pocsag_decoder"].digital_binary_slicer_fb, self.freqs[freq]["uchar2float"], (self.sel_f.ss, 3)) 302 | 303 | def connect_sink(self, freq): 304 | self.topblock.connect(self.freqs[freq]["freq_xlating_fir_filter"], (self.sel_c.ss, 1)) 305 | self.topblock.connect(self.freqs[freq]["pocsag_decoder"].fractional_interpolator, (self.sel_c.ss, 2)) 306 | self.topblock.connect(self.freqs[freq]["pocsag_decoder"].quadrature_demod, (self.sel_f.ss, 0)) 307 | self.topblock.connect(self.freqs[freq]["pocsag_decoder"].low_pass_filter, (self.sel_f.ss, 1)) 308 | self.topblock.connect(self.freqs[freq]["pocsag_decoder"].digital_clock_recovery_mm, (self.sel_f.ss, 2)) 309 | self.topblock.connect(self.freqs[freq]["pocsag_decoder"].digital_binary_slicer_fb, self.freqs[freq]["uchar2float"], (self.sel_f.ss, 3)) 310 | 311 | def select_freq(self): 312 | if len(self.freq_list.selectedItems()) == 0: 313 | return 314 | freq = str(self.freq_list.selectedItems()[0].text()) 315 | # Stop the flowchart 316 | self.topblock.stop() 317 | self.topblock.wait() 318 | # self.topblock.lock() 319 | # Disconnect the old selection 320 | if self.selected_freq: 321 | self.disconnect_sink(self.selected_freq) 322 | # Connect the new selection 323 | self.connect_sink(freq) 324 | # Restart the flowgraph 325 | self.topblock.start() 326 | # self.topblock.unlock() 327 | # Adjust the UI info 328 | self.set_uisink_frequency_range() 329 | self.enable_selector_buttons(True) 330 | self.selected_freq = freq 331 | 332 | def remove_selected_freq(self): 333 | if self.selected_freq == None: return 334 | self.remove_freq(self.selected_freq) 335 | 336 | def remove_freq(self, freq): 337 | if freq == None or freq not in self.freqs: return 338 | self.push_text("Removing %s" % freq) 339 | self.topblock.stop() 340 | self.topblock.wait() 341 | if self.selected_freq == freq: self.disconnect_sink(freq) 342 | self.topblock.disconnect(self.topblock.source, 343 | self.freqs[freq]["freq_xlating_fir_filter"], 344 | self.freqs[freq]["pocsag_decoder"], 345 | self.freqs[freq]["msgsink"]) 346 | self.topblock.start() 347 | self.enable_selector_buttons(False) 348 | del self.freqs[freq] 349 | self.set_uisink_frequency_range() 350 | if self.selected_freq == freq: self.selected_freq = None 351 | self.freq_list.takeItem(self.freq_list.row(self.freq_list.findItems(freq, QtCore.Qt.MatchExactly)[0])) 352 | 353 | def set_freqcorr(self, freqcorr): 354 | self.freqcorr = freqcorr 355 | self.topblock.source.set_freq_corr(self.freqcorr, 0) 356 | self.freqcorr_edit.setText("%.3f" % self.freqcorr) 357 | self.push_text("Setting freq. correction to %.3f ppm" % self.freqcorr) 358 | 359 | def set_samplerate(self, samplerate): 360 | self.samplerate = samplerate 361 | self.samplerate_edit.setText("%.3fM" % (self.samplerate / 1e6)) 362 | self.push_text("Setting sample rate to %.3fMhz" % (self.samplerate / 1e6)) 363 | self.update_freqs() 364 | self.set_uisink_frequency_range() 365 | 366 | def centerfreq_edittext(self): 367 | # try: 368 | self.set_centerfreq(eng_notation.str_to_num(str(self.centerfreq_edit.text()))) 369 | # except ValueError: 370 | # self.push_text("Bad center frequency value entered") 371 | 372 | def addfreq_edittext(self): 373 | try: 374 | self.addfreq(eng_notation.str_to_num(str(self.addfreq_edit.text()))) 375 | except ValueError: 376 | self.push_text("Bad frequency value entered") 377 | 378 | def symrate_edittext(self): 379 | try: 380 | self.symrate = eng_notation.str_to_num(str(self.symrate_edit.text())) 381 | self.push_text("Setting symbol rate to %.3fbaud\n" % self.symrate) 382 | except ValueError: 383 | self.push_text("Bad symbol rate value entered\n") 384 | 385 | def samplerate_edittext(self): 386 | try: 387 | self.set_samplerate(eng_notation.str_to_num(str(self.samplerate_edit.text()))) 388 | except ValueError: 389 | self.push_text("Bad sample rate value entered") 390 | 391 | def freqcorr_edittext(self): 392 | try: 393 | self.set_freqcorr(eng_notation.str_to_num(str(self.freqcorr_edit.text()))) 394 | except ValueError: 395 | self.push_text("Bad Freq. correction value entered") 396 | 397 | def debug_state(self, state): 398 | for value in self.freqs.values(): 399 | value["pocsag_decoder"].set_debug(state == QtCore.Qt.Checked) 400 | 401 | def srcsink_state(self, state): 402 | if state == QtCore.Qt.Checked: 403 | self.srcsink.show() 404 | else: 405 | self.srcsink.hide() 406 | 407 | def demodsink_state(self, state): 408 | if state == QtCore.Qt.Checked: 409 | self.demodsink.show() 410 | else: 411 | self.demodsink.hide() 412 | 413 | class my_top_block(gr.top_block): 414 | def __init__(self, args): 415 | gr.top_block.__init__(self) 416 | self.source = osmosdr.source_c() if not args.input_file else osmosdr.source_c("file=%s,rate=%f,repeat=%s,freq=%f" % (args.input_file, args.samplerate, args.loop, args.centerfreq)) 417 | self.source.set_freq_corr(args.freqcorr, 0) 418 | self.source.set_sample_rate(args.samplerate) 419 | self.source.set_center_freq(args.centerfreq, 0) 420 | self.source.set_gain_mode(0, 0) 421 | self.source.set_gain(10, 0) 422 | self.source.set_if_gain(24, 0) 423 | if args.output_file: 424 | self.file_sink = gr.file_sink(gr.sizeof_gr_complex, args.output_file) 425 | self.connect(self.source, self.file_sink) 426 | 427 | if __name__ == "__main__": 428 | print BANNER 429 | parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter) 430 | parser.add_argument('-i', '--input', dest='input_file', action='store', 431 | help='read the samples from a file') 432 | parser.add_argument('-l', '--loop', dest='loop', action='store_const', 433 | const='true', default='false', help='when reading from a file, loop the samples') 434 | parser.add_argument('-o', '--output', dest='output_file', action='store', 435 | help='save the samples to a file') 436 | parser.add_argument('-c', '--freqcorr', dest='freqcorr', action='store', 437 | type=eng_notation.str_to_num, default=INI_FREQ_CORR, help='set the frequency correction (ppm)') 438 | parser.add_argument('-f', '--freq', dest='centerfreq', action='store', 439 | type=eng_notation.str_to_num, default=INI_FREQ, help='set the center frequency') 440 | parser.add_argument('-r', '--samplerate', dest='samplerate', action='store', 441 | type=eng_notation.str_to_num, default=INI_SAMPLERATE, help='set the samplerate') 442 | parser.add_argument('-s', '--symrate', dest='symrate', action='store', 443 | type=int, default=INI_SYMRATE, help='set the symbol rate') 444 | parser.add_argument('-C', '--channelsfile', dest='channels_file', type=file, 445 | help='read an initial channels list from a file') 446 | args = parser.parse_args() 447 | 448 | # init the flowgraph and run it 449 | tb = my_top_block(args) 450 | tb.start() 451 | # build and show the UI 452 | qapp = QtGui.QApplication(sys.argv) 453 | main_window = main_window(tb, args) 454 | main_window.show() 455 | # Run rabbit, run! 456 | qapp.exec_() 457 | tb.stop() 458 | 459 | -------------------------------------------------------------------------------- /pocsag-mrt_demodsink.ui: -------------------------------------------------------------------------------- 1 | 2 | 3 | DemodulationSink 4 | 5 | 6 | 7 | 0 8 | 0 9 | 640 10 | 480 11 | 12 | 13 | 14 | Demodulation Sink 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 150 24 | 130 25 | 26 | 27 | 28 | 29 | 150 30 | 130 31 | 32 | 33 | 34 | Wave Selector 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | Quad demod 43 | 44 | 45 | 46 | 47 | 48 | 49 | Low pass 50 | 51 | 52 | 53 | 54 | 55 | 56 | Clock recovery 57 | 58 | 59 | 60 | 61 | 62 | 63 | Bits 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | -------------------------------------------------------------------------------- /pocsag-mrt_main.ui: -------------------------------------------------------------------------------- 1 | 2 | 3 | MainWindow 4 | 5 | 6 | 7 | 0 8 | 0 9 | 640 10 | 480 11 | 12 | 13 | 14 | 15 | 640 16 | 480 17 | 18 | 19 | 20 | 21 | 640 22 | 480 23 | 24 | 25 | 26 | POCSAG Multichannel Realtime Decoder 27 | 28 | 29 | 30 | 31 | 32 | 10 33 | 160 34 | 621 35 | 311 36 | 37 | 38 | 39 | true 40 | 41 | 42 | 43 | 44 | 45 | 340 46 | 10 47 | 131 48 | 121 49 | 50 | 51 | 52 | 53 | 0 54 | 55 | 56 | 57 | 58 | e.g. '100.025M' 59 | 60 | 61 | 62 | 63 | 64 | 65 | 0 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 10 75 | 140 76 | 62 77 | 16 78 | 79 | 80 | 81 | Console: 82 | 83 | 84 | 85 | 86 | 87 | 10 88 | 10 89 | 311 90 | 120 91 | 92 | 93 | 94 | 95 | 96 | 97 | Freq. Correction (ppm): 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | Sample Rate: 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | Symbol Rate: 118 | 119 | 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127 | Center Frequency: 128 | 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 490 140 | 10 141 | 145 142 | 62 143 | 144 | 145 | 146 | 147 | 148 | 149 | Source Sink 150 | 151 | 152 | 153 | 154 | 155 | 156 | Demodulation Sink 157 | 158 | 159 | 160 | 161 | 162 | 163 | Debug 164 | 165 | 166 | 167 | 168 | 169 | 170 | 171 | 172 | 173 | 174 | -------------------------------------------------------------------------------- /pocsag-mrt_srcsink.ui: -------------------------------------------------------------------------------- 1 | 2 | 3 | Form 4 | 5 | 6 | 7 | 0 8 | 0 9 | 640 10 | 480 11 | 12 | 13 | 14 | Source Sink 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 130 24 | 110 25 | 26 | 27 | 28 | 29 | 130 30 | 110 31 | 32 | 33 | 34 | Wave Selector 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | Source 43 | 44 | 45 | 46 | 47 | 48 | 49 | Xlating 50 | 51 | 52 | 53 | 54 | 55 | 56 | Interpolator 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | -------------------------------------------------------------------------------- /pocsag.py: -------------------------------------------------------------------------------- 1 | # GNURadio block for POCSAG decoding 2 | # Copyright (c) 2012 iZsh -- izsh at fail0verflow.com 3 | # 4 | # This program is free software: you can redistribute it and/or modify 5 | # it under the terms of the GNU General Public License as published by 6 | # the Free Software Foundation, either version 3 of the License, or 7 | # (at your option) any later version. 8 | # 9 | # This program is distributed in the hope that it will be useful, 10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | # GNU General Public License for more details. 13 | # 14 | # You should have received a copy of the GNU General Public License 15 | # along with this program. If not, see . 16 | from gruel import pmt 17 | from gnuradio import gr 18 | from gnuradio import digital 19 | from gnuradio import extras 20 | import numpy 21 | 22 | POCSAG_ID = "POCSAG" 23 | SYMRATE = 1200 24 | FM_DEVIATION = 4500 # standard deviation is 4.5kHz 25 | SPS = 8 # signal per symbol 26 | 27 | # yeah I know, it's slow, and there are nice bit tricks to do this, 28 | # but meh 29 | def hamming_weight(val): 30 | return bin(val).count('1') 31 | 32 | def is_evenparity(val): 33 | return True if hamming_weight(val) & 1 else False 34 | 35 | # the code used by POCSAG is a (n=31,k=21) BCH Code with dmin=5, 36 | # thus it could correct two bit errors in a 31-Bit codeword. 37 | # It is a systematic code. 38 | # The generator polynomial is: 39 | # g(x) = x^10+x^9+x^8+x^6+x^5+x^3+1 40 | # The parity check polynomial is: 41 | # h(x) = x^21+x^20+x^18+x^16+x^14+x^13+x^12+x^11+x^8+x^5+x^3+1 42 | # g(x) * h(x) = x^n+1 43 | # 44 | POCSAG_BCH_POLY = 0x769 45 | POCSAG_BCH_N = 31 46 | POCSAG_BCH_K = 21 47 | 48 | def BCH_syndrome(data, BCH_POLY, BCH_N, BCH_K): 49 | mask = 1 << (BCH_N - 1) 50 | coeff = BCH_POLY << (BCH_K - 1) 51 | n = BCH_K 52 | 53 | s = data >> 1 # throw away parity bit 54 | while n > 0: 55 | if s & mask: 56 | s ^= coeff 57 | n -= 1 58 | mask >>= 1 59 | coeff >>= 1 60 | if is_evenparity(data): 61 | s |= 1 << (BCH_N - BCH_K) 62 | 63 | return s 64 | 65 | def BCH_fix(data, BCH_POLY, BCH_N, BCH_K): 66 | for i in xrange(32): 67 | t = data ^ (1 << i) 68 | if BCH_syndrome(t, BCH_POLY, BCH_N, BCH_K) == 0: 69 | return t 70 | for i in xrange(32): 71 | for j in xrange(i + 1, 32): 72 | t = data ^ ((1 << i) | (1 << j)) 73 | if BCH_syndrome(t, BCH_POLY, BCH_N, BCH_K) == 0: 74 | return t 75 | return data 76 | 77 | # automata states 78 | POCSAG_SEARCH_PREAMBLE_START = 0 79 | POCSAG_SEARCH_PREAMBLE_END = 1 80 | POCSAG_SYNC = 2 81 | POCSAG_SEARCH_SYNC = 3 82 | POCSAG_SYNCHED = 4 83 | # Some constants 84 | POCSAG_STD_SYNC = 0x7cd215d8 85 | POCSAG_STD_IDLE = 0x7a89c197 86 | POCSAG_WORDSIZE = 32 87 | POCSAG_SOFTTHRESHOLD = 2 88 | POCSAG_MAXWORD = 16 89 | 90 | class pocsag_pktdecoder(gr.block): 91 | def __init__(self, channel_str = None, sendmsg = True, debug = False): 92 | gr.block.__init__( 93 | self, 94 | name = "pocsag", 95 | in_sig = [numpy.uint8], 96 | out_sig = None, 97 | num_msg_outputs = 1 98 | ) 99 | self.channel_str = channel_str 100 | self.sendmsg = sendmsg 101 | self.debug = debug 102 | self.acc = 0 103 | self.bcnt = 0 104 | self.wcnt = -1 105 | self.reset_txtvars() 106 | # there's two ways/two automata: 107 | # - one search for the preamble and then for the SYNC word 108 | # (this could be useful to extend to non-standard SYNC words) 109 | # - the other one directly looks for the SYNC word 110 | # To properly factorize the code, we just set the initial 111 | # automata state, and the code will take care of taking the 112 | # proper path 113 | self.init_state = POCSAG_SEARCH_SYNC 114 | self.state = self.init_state 115 | self.compute_syncmask(32) 116 | # self.compute_syncmask(576) 117 | 118 | def reset_txtvars(self): 119 | self.activetxt = False 120 | self.txt = "" 121 | self.num = "" 122 | self.txt_w = 0 123 | self.txt_bcnt = 0 124 | self.addr = 0 125 | self.fun = 0 126 | 127 | def compute_syncmask(self, length): 128 | self.preamble = 0 129 | assert(length % 2 == 0) 130 | for i in xrange(length / 2): 131 | self.preamble = (self.preamble << 2) | 0b10 132 | self.preamble_mask = 2 ** length - 1 133 | self.preamble_shifted = ((self.preamble << 1) | 1) & self.preamble_mask 134 | 135 | def send_txt(self, endofmsg = False): 136 | if self.sendmsg and (self.addr != 0 or len(self.txt) > 0): 137 | self.post_msg(0, 138 | pmt.pmt_string_to_symbol(POCSAG_ID), 139 | pmt.from_python( 140 | { 141 | "addr": self.addr, 142 | "fun": self.fun, 143 | "text": self.txt, 144 | "num": self.num, 145 | "endofmsg": endofmsg, 146 | "channel": self.channel_str 147 | }) 148 | ) 149 | 150 | def BCH_syndrome(self, data): 151 | return BCH_syndrome(data, POCSAG_BCH_POLY, POCSAG_BCH_N, POCSAG_BCH_K) 152 | 153 | def BCH_fix(self, data): 154 | return BCH_fix(data, POCSAG_BCH_POLY, POCSAG_BCH_N, POCSAG_BCH_K) 155 | 156 | def log(self, word, hammingw, status, txt): 157 | status_str = "OK" if status else "ERR" 158 | if self.debug: 159 | print "%2d %08x (%08x) %d %3s %s" % (self.wcnt, word, self.acc, hammingw, status_str, txt) 160 | 161 | def add_preamble_bit(self, b): 162 | self.add_bit(b, self.preamble_mask) 163 | 164 | def add_bit(self, b, mask = 0xFFFFFFFF): 165 | self.bcnt += 1 166 | self.acc = ((self.acc << 1) | int(~b & 1)) & mask 167 | 168 | def read_word(self, inp): 169 | assert(len(inp) >= POCSAG_WORDSIZE) 170 | self.acc = 0 171 | self.bcnt = 0 172 | for i in xrange(POCSAG_WORDSIZE): 173 | self.add_bit(inp[i]) 174 | 175 | def push_text(self, data): 176 | for i in reversed(xrange(20)): 177 | b = (data >> i) & 1 178 | self.txt_w = (self.txt_w >> 1) | (b << 6) 179 | self.txt_bcnt += 1 180 | if self.txt_bcnt == 7: 181 | self.txt += chr(self.txt_w) 182 | self.txt_w = 0 183 | self.txt_bcnt = 0 184 | 185 | def push_num(self, data): 186 | num = "" 187 | for i in xrange(5): 188 | num += "0123456789*U -)("[(data >> (16 - 4 * i)) & 0xF] 189 | self.num += num 190 | return num 191 | 192 | def work(self, input_items, output_items): 193 | return { 194 | POCSAG_SEARCH_PREAMBLE_START: self.search_preamble_start, 195 | POCSAG_SEARCH_PREAMBLE_END: self.search_preamble_end, 196 | POCSAG_SYNC: self.sync, 197 | POCSAG_SEARCH_SYNC: self.search_sync, 198 | POCSAG_SYNCHED: self.synched 199 | }[self.state](input_items[0]) 200 | 201 | # it is not really needed, we could directly look for the SYNC word 202 | # but let's keep this code, it could be useful in case something 203 | # is not using a standard SYNC word 204 | def search_preamble_start(self, inp): 205 | self.wcnt = -1 206 | self.reset_txtvars() 207 | for i in xrange(len(inp)): 208 | self.add_preamble_bit(inp[i]) 209 | if self.acc == self.preamble or self.acc == self.preamble_shifted: 210 | print "Found preamble @ %d, with 0x%x" % (self.bcnt, self.acc) 211 | self.state = POCSAG_SEARCH_PREAMBLE_END 212 | return i + 1 213 | return len(inp) 214 | 215 | def search_preamble_end(self, inp): 216 | for i in xrange(len(inp)): 217 | self.add_preamble_bit(inp[i]) 218 | if self.acc != self.preamble and self.acc != self.preamble_shifted: 219 | print "Found end of preamble @ %d, 0x%x " % (self.bcnt, self.acc) 220 | self.state = POCSAG_SYNC 221 | return i 222 | return len(inp) 223 | 224 | def search_sync(self, inp): 225 | self.wcnt = -1 226 | self.reset_txtvars() 227 | for i in xrange(len(inp)): 228 | self.add_bit(inp[i]) 229 | hw = hamming_weight(self.acc ^ POCSAG_STD_SYNC) 230 | if hw <= POCSAG_SOFTTHRESHOLD: 231 | self.log(self.acc, hw, True, "=> SYNC") 232 | self.state = POCSAG_SYNCHED 233 | return i + 1 234 | return len(inp) 235 | 236 | def sync(self, inp): 237 | # wait till we have at least enough bit 238 | # this simplify the following code 239 | if len(inp) < POCSAG_WORDSIZE: 240 | return 0 241 | self.wcnt = -1 242 | self.read_word(inp) 243 | hw = hamming_weight(self.acc ^ POCSAG_STD_SYNC) 244 | if hw <= POCSAG_SOFTTHRESHOLD: 245 | self.log(self.acc, hw, True, "=> SYNC") 246 | self.state = POCSAG_SYNCHED 247 | else: 248 | self.log(self.acc, hw, False, "=> lost sync!") 249 | self.send_txt(False) 250 | self.state = self.init_state 251 | return POCSAG_WORDSIZE 252 | 253 | def synched(self, inp): 254 | if len(inp) < POCSAG_WORDSIZE: 255 | return 0 256 | self.wcnt += 1 257 | if self.wcnt >= POCSAG_MAXWORD: 258 | self.state = POCSAG_SYNC 259 | return 0 260 | self.read_word(inp) 261 | w = self.acc 262 | if self.BCH_syndrome(w) != 0: 263 | w = self.BCH_fix(self.acc) 264 | if self.BCH_syndrome(w): 265 | self.log(w, hamming_weight(self.acc ^ w), False, "=> lost sync!") 266 | self.send_txt(False) 267 | self.state = self.init_state 268 | return POCSAG_WORDSIZE 269 | assert(w != POCSAG_STD_SYNC) 270 | if w == POCSAG_STD_IDLE and self.activetxt: 271 | self.log(w, hamming_weight(self.acc ^ POCSAG_STD_IDLE), True, "=> IDLE (end of message)") 272 | self.send_txt(True) 273 | self.reset_txtvars() 274 | elif w == POCSAG_STD_IDLE: 275 | self.log(w, hamming_weight(self.acc ^ POCSAG_STD_IDLE), True, "=> IDLE") 276 | elif w & (1 << 31): 277 | self.decode_data(w) 278 | else: 279 | self.decode_addr(w) 280 | return POCSAG_WORDSIZE 281 | 282 | def decode_data(self, w): 283 | data = (w >> 11) & (2 ** 20 - 1) 284 | self.push_text(data) 285 | num = self.push_num(data) 286 | self.log(w, hamming_weight(self.acc ^ w), True, "=> NUM: |%s| - TXT: |%s|" % (num, self.txt)) 287 | 288 | def decode_addr(self, w): 289 | self.reset_txtvars() 290 | self.activetxt = True 291 | self.addr = ((w >> 13) & (2 ** 18 - 1)) | (self.wcnt / 2) 292 | self.fun = (w >> 11) & 3 293 | self.log(w, hamming_weight(self.acc ^ w), True, "=> Pager %d (fun = %d)" % (self.addr, self.fun)) 294 | 295 | class pocsag_decoder(gr.hier_block2): 296 | def __init__(self, samplerate, symbolrate = SYMRATE, channel_str = None, 297 | sendmsg = True, debug = False, 298 | samplepersymbol = SPS, fmdeviation = FM_DEVIATION 299 | ): 300 | 301 | gr.hier_block2.__init__(self, "pocsag", 302 | gr.io_signature(1, 1, gr.sizeof_gr_complex), gr.io_signature(1, 1, 1)) 303 | 304 | self.samplerate = samplerate 305 | self.symbolrate = symbolrate 306 | self.sendmsg = sendmsg 307 | self.debug = debug 308 | self.samplepersymbol = samplepersymbol 309 | self.fmdeviation = fmdeviation 310 | 311 | self.fractional_interpolator = gr.fractional_interpolator_cc(0, 1.0 * samplerate / (symbolrate * samplepersymbol)) 312 | self.quadrature_demod = gr.quadrature_demod_cf((symbolrate * samplepersymbol) / (fmdeviation * 4.0)) 313 | self.low_pass_filter = gr.fir_filter_fff(1, gr.firdes.low_pass(1, symbolrate * samplepersymbol, symbolrate * 2, symbolrate / 2.0, gr.firdes.WIN_HAMMING, 6.76)) 314 | self.digital_clock_recovery_mm = digital.clock_recovery_mm_ff(samplepersymbol, 0.03 * 0.03 * 0.3, 0.4, 0.03, 1e-4) 315 | self.digital_binary_slicer_fb = digital.binary_slicer_fb() 316 | self.pktdecoder = pocsag_pktdecoder(channel_str = channel_str, sendmsg = sendmsg, debug = debug) 317 | self.connect(self, 318 | self.fractional_interpolator, 319 | self.quadrature_demod, 320 | self.low_pass_filter, 321 | self.digital_clock_recovery_mm, 322 | self.digital_binary_slicer_fb, 323 | self.pktdecoder, 324 | self) 325 | 326 | def set_debug(self, debug = False): 327 | self.debug = debug 328 | self.pktdecoder.debug = debug 329 | --------------------------------------------------------------------------------