213 lines
8.0 KiB
Python
213 lines
8.0 KiB
Python
# Copyright 2013 Nick Foster
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#
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# This file is part of gr-air-modes
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#
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# gr-air-modes 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-air-modes 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-air-modes; 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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# Radio interface for Mode S RX.
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# Handles all hardware- and source-related functionality
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# You pass it options, it gives you data.
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# It uses the pubsub interface to allow clients to subscribe to its data feeds.
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from gnuradio import gr, gru, eng_notation, filter, blocks
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from gnuradio.filter import optfir
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from gnuradio.eng_option import eng_option
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from gnuradio.gr.pubsub import pubsub
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from optparse import OptionParser, OptionGroup
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import air_modes
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import zmq
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import threading
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import time
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import re
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class modes_radio (gr.top_block, pubsub):
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def __init__(self, options, context):
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gr.top_block.__init__(self)
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pubsub.__init__(self)
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self._options = options
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self._queue = gr.msg_queue()
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self._rate = int(options.rate)
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self._resample = None
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self._setup_source(options)
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self._rx_path = air_modes.rx_path(self._rate, options.threshold,
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self._queue, options.pmf, options.dcblock)
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#now subscribe to set various options via pubsub
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self.subscribe("freq", self.set_freq)
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self.subscribe("gain", self.set_gain)
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self.subscribe("rate", self.set_rate)
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self.subscribe("rate", self._rx_path.set_rate)
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self.subscribe("threshold", self._rx_path.set_threshold)
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self.subscribe("pmf", self._rx_path.set_pmf)
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self.publish("freq", self.get_freq)
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self.publish("gain", self.get_gain)
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self.publish("rate", self.get_rate)
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self.publish("threshold", self._rx_path.get_threshold)
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self.publish("pmf", self._rx_path.get_pmf)
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if self._resample is not None:
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self.connect(self._u, self._resample, self._rx_path)
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else:
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self.connect(self._u, self._rx_path)
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#Publish messages when they come back off the queue
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server_addr = ["inproc://modes-radio-pub"]
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if options.tcp is not None:
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server_addr += ["tcp://*:%i" % options.tcp]
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self._sender = air_modes.zmq_pubsub_iface(context, subaddr=None, pubaddr=server_addr)
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self._async_sender = gru.msgq_runner(self._queue, self.send)
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def send(self, msg):
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self._sender["dl_data"] = msg.to_string()
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@staticmethod
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def add_radio_options(parser):
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group = OptionGroup(parser, "Receiver setup options")
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#Choose source
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group.add_option("-s","--source", type="string", default="uhd",
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help="Choose source: uhd, osmocom, <filename>, or <ip:port> [default=%default]")
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group.add_option("-t","--tcp", type="int", default=None, metavar="PORT",
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help="Open a TCP server on this port to publish reports")
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#UHD/Osmocom args
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group.add_option("-R", "--subdev", type="string",
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help="select USRP Rx side A or B", metavar="SUBDEV")
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group.add_option("-A", "--antenna", type="string",
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help="select which antenna to use on daughterboard")
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group.add_option("-D", "--args", type="string",
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help="arguments to pass to radio constructor", default="")
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group.add_option("-f", "--freq", type="eng_float", default=1090e6,
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help="set receive frequency in Hz [default=%default]", metavar="FREQ")
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group.add_option("-g", "--gain", type="int", default=None,
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help="set RF gain", metavar="dB")
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#RX path args
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group.add_option("-r", "--rate", type="eng_float", default=4e6,
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help="set sample rate [default=%default]")
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group.add_option("-T", "--threshold", type="eng_float", default=7.0,
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help="set pulse detection threshold above noise in dB [default=%default]")
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group.add_option("-p","--pmf", action="store_true", default=False,
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help="Use pulse matched filtering [default=%default]")
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group.add_option("-d","--dcblock", action="store_true", default=False,
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help="Use a DC blocking filter (best for HackRF Jawbreaker) [default=%default]")
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parser.add_option_group(group)
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def live_source(self):
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return self._options.source=="uhd" or self._options.source=="osmocom"
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def set_freq(self, freq):
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return self._u.set_center_freq(freq, 0) if self.live_source() else 0
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def set_gain(self, gain):
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if self.live_source():
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self._u.set_gain(gain)
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print "Gain is %f" % self.get_gain()
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return self.get_gain()
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def set_rate(self, rate):
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self._rx_path.set_rate(rate)
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return self._u.set_rate(rate) if self.live_source() else 0
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def set_threshold(self, threshold):
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self._rx_path.set_threshold(threshold)
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def get_freq(self, freq):
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return self._u.get_center_freq(freq, 0) if self.live_source() else 1090e6
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def get_gain(self):
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return self._u.get_gain() if self.live_source() else 0
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def get_rate(self):
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return self._u.get_rate() if self.live_source() else self._rate
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def _setup_source(self, options):
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if options.source == "uhd":
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#UHD source by default
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from gnuradio import uhd
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self._u = uhd.single_usrp_source(options.args, uhd.io_type_t.COMPLEX_FLOAT32, 1)
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if(options.subdev):
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self._u.set_subdev_spec(options.subdev, 0)
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if not self._u.set_center_freq(options.freq):
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print "Failed to set initial frequency"
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#check for GPSDO
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#if you have a GPSDO, UHD will automatically set the timestamp to UTC time
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#as well as automatically set the clock to lock to GPSDO.
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if self._u.get_time_source(0) != 'gpsdo':
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self._u.set_time_now(uhd.time_spec(0.0))
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if options.antenna is not None:
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self._u.set_antenna(options.antenna)
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self._u.set_samp_rate(options.rate)
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options.rate = int(self._u.get_samp_rate()) #retrieve actual
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if options.gain is None: #set to halfway
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g = self._u.get_gain_range()
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options.gain = (g.start()+g.stop()) / 2.0
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print "Setting gain to %i" % options.gain
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self._u.set_gain(options.gain)
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print "Gain is %i" % self._u.get_gain()
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#TODO: detect if you're using an RTLSDR or Jawbreaker
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#and set up accordingly.
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elif options.source == "osmocom": #RTLSDR dongle or HackRF Jawbreaker
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import osmosdr
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self._u = osmosdr.source(options.args)
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# self._u.set_sample_rate(3.2e6) #fixed for RTL dongles
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self._u.set_sample_rate(options.rate)
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if not self._u.set_center_freq(options.freq):
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print "Failed to set initial frequency"
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# self._u.set_gain_mode(0) #manual gain mode
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if options.gain is None:
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options.gain = 34
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self._u.set_gain(options.gain)
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print "Gain is %i" % self._u.get_gain()
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#Note: this should only come into play if using an RTLSDR.
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# lpfiltcoeffs = gr.firdes.low_pass(1, 5*3.2e6, 1.6e6, 300e3)
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# self._resample = filter.rational_resampler_ccf(interpolation=5, decimation=4, taps=lpfiltcoeffs)
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else:
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#semantically detect whether it's ip.ip.ip.ip:port or filename
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if ':' in options.source:
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try:
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ip, port = re.search("(.*)\:(\d{1,5})", options.source).groups()
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except:
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raise Exception("Please input UDP source e.g. 192.168.10.1:12345")
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self._u = gr.udp_source(gr.sizeof_gr_complex, ip, int(port))
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print "Using UDP source %s:%s" % (ip, port)
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else:
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self._u = blocks.file_source(gr.sizeof_gr_complex, options.source)
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print "Using file source %s" % options.source
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print "Rate is %i" % (options.rate,)
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def close(self):
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self._sender.close()
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self._u = None
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