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gr-air-modes/python/radio.py

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# Copyright 2013 Nick Foster
#
# This file is part of gr-air-modes
#
# gr-air-modes 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-air-modes 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-air-modes; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
# Radio interface for Mode S RX.
# Handles all hardware- and source-related functionality
# You pass it options, it gives you data.
# It uses the pubsub interface to allow clients to subscribe to its data feeds.
from gnuradio import gr, gru, eng_notation, filter, blocks
from gnuradio.filter import optfir
from gnuradio.eng_option import eng_option
from gnuradio.gr.pubsub import pubsub
from gnuradio.filter import pfb
from optparse import OptionParser, OptionGroup
import air_modes
import zmq
import threading
import time
import re
class modes_radio (gr.top_block, pubsub):
def __init__(self, options, context):
gr.top_block.__init__(self)
pubsub.__init__(self)
self._options = options
self._queue = gr.msg_queue()
self._rate = int(options.rate)
self._resample = None
self._setup_source(options)
if self._rate < 4e6:
self._resample = pfb.arb_resampler_ccf(4.e6/self._rate)
self._rx_rate = 4e6
else:
self._rx_rate = self._rate
self._rx_path = air_modes.rx_path(self._rx_rate, options.threshold,
self._queue, options.pmf, options.dcblock)
#now subscribe to set various options via pubsub
self.subscribe("freq", self.set_freq)
self.subscribe("gain", self.set_gain)
self.subscribe("rate", self.set_rate)
self.subscribe("rate", self._rx_path.set_rate)
self.subscribe("threshold", self._rx_path.set_threshold)
self.subscribe("pmf", self._rx_path.set_pmf)
self.publish("freq", self.get_freq)
self.publish("gain", self.get_gain)
self.publish("rate", self.get_rate)
self.publish("threshold", self._rx_path.get_threshold)
self.publish("pmf", self._rx_path.get_pmf)
if self._resample is not None:
self.connect(self._u, self._resample, self._rx_path)
else:
self.connect(self._u, self._rx_path)
#Publish messages when they come back off the queue
server_addr = ["inproc://modes-radio-pub"]
if options.tcp is not None:
server_addr += ["tcp://*:%i" % options.tcp]
self._sender = air_modes.zmq_pubsub_iface(context, subaddr=None, pubaddr=server_addr)
self._async_sender = gru.msgq_runner(self._queue, self.send)
def send(self, msg):
self._sender["dl_data"] = msg.to_string()
@staticmethod
def add_radio_options(parser):
group = OptionGroup(parser, "Receiver setup options")
#Choose source
group.add_option("-s","--source", type="string", default="uhd",
help="Choose source: uhd, osmocom, <filename>, or <ip:port> [default=%default]")
group.add_option("-t","--tcp", type="int", default=None, metavar="PORT",
help="Open a TCP server on this port to publish reports")
#UHD/Osmocom args
group.add_option("-R", "--subdev", type="string",
help="select USRP Rx side A or B", metavar="SUBDEV")
group.add_option("-A", "--antenna", type="string",
help="select which antenna to use on daughterboard")
group.add_option("-D", "--args", type="string",
help="arguments to pass to radio constructor", default="")
group.add_option("-f", "--freq", type="eng_float", default=1090e6,
help="set receive frequency in Hz [default=%default]", metavar="FREQ")
group.add_option("-g", "--gain", type="int", default=None,
help="set RF gain", metavar="dB")
#RX path args
group.add_option("-r", "--rate", type="eng_float", default=4e6,
help="set sample rate [default=%default]")
group.add_option("-T", "--threshold", type="eng_float", default=7.0,
help="set pulse detection threshold above noise in dB [default=%default]")
group.add_option("-p","--pmf", action="store_true", default=True,
help="Use pulse matched filtering [default=%default]")
group.add_option("-d","--dcblock", action="store_true", default=False,
help="Use a DC blocking filter (best for HackRF Jawbreaker) [default=%default]")
parser.add_option_group(group)
def live_source(self):
return self._options.source=="uhd" or self._options.source=="osmocom"
def set_freq(self, freq):
return self._u.set_center_freq(freq, 0) if self.live_source() else 0
def set_gain(self, gain):
if self.live_source():
self._u.set_gain(gain)
print("Gain is %f" % self.get_gain())
return self.get_gain()
def set_rate(self, rate):
if(rate < 4e6 and self._rate > 4e6):
raise NotImplementedError("Lowering rate <4e6Msps not currently supported.")
if(rate < 4e6):
self._resample.set_rate(4e6/rate)
self._rx_rate = 4e6
else:
self._rx_rate = rate
self._rx_path.set_rate(self._rx_rate)
if self._options.source in ("osmocom"):
return self._u.set_sample_rate(rate)
if self._options.source in ("uhd"):
return self._u.set_rate(rate)
else:
return 0
def set_threshold(self, threshold):
self._rx_path.set_threshold(threshold)
def get_freq(self, freq):
return self._u.get_center_freq(freq, 0) if self.live_source() else 1090e6
def get_gain(self):
return self._u.get_gain() if self.live_source() else 0
def get_rate(self):
return self._u.get_rate() if self.live_source() else self._rate
def _setup_source(self, options):
if options.source == "uhd":
#UHD source by default
from gnuradio import uhd
self._u = uhd.usrp_source(
options.args,
uhd.stream_args(
cpu_format="fc32",
channels=range(1),
),
)
if(options.subdev):
self._u.set_subdev_spec(options.subdev, 0)
if not self._u.set_center_freq(options.freq):
print("Failed to set initial frequency")
#check for GPSDO
#if you have a GPSDO, UHD will automatically set the timestamp to UTC time
#as well as automatically set the clock to lock to GPSDO.
if self._u.get_time_source(0) != 'gpsdo':
self._u.set_time_now(uhd.time_spec(0.0))
if options.antenna is not None:
self._u.set_antenna(options.antenna)
self._u.set_samp_rate(options.rate)
options.rate = int(self._u.get_samp_rate()) #retrieve actual
if options.gain is None: #set to halfway
g = self._u.get_gain_range()
options.gain = (g.start()+g.stop()) / 2.0
print("Setting gain to %i" % options.gain)
self._u.set_gain(options.gain)
print("Gain is %i" % self._u.get_gain())
#TODO: detect if you're using an RTLSDR or Jawbreaker
#and set up accordingly.
elif options.source == "osmocom": #RTLSDR dongle or HackRF Jawbreaker
import osmosdr
self._u = osmosdr.source(options.args)
# self._u.set_sample_rate(3.2e6) #fixed for RTL dongles
self._u.set_sample_rate(options.rate)
if not self._u.set_center_freq(options.freq):
print("Failed to set initial frequency")
# self._u.set_gain_mode(0) #manual gain mode
if options.gain is None:
options.gain = 34
self._u.set_gain(options.gain)
print("Gain is %i" % self._u.get_gain())
#Note: this should only come into play if using an RTLSDR.
# lpfiltcoeffs = gr.firdes.low_pass(1, 5*3.2e6, 1.6e6, 300e3)
# self._resample = filter.rational_resampler_ccf(interpolation=5, decimation=4, taps=lpfiltcoeffs)
else:
#semantically detect whether it's ip.ip.ip.ip:port or filename
if ':' in options.source:
try:
ip, port = re.search("(.*)\:(\d{1,5})", options.source).groups()
except:
raise Exception("Please input UDP source e.g. 192.168.10.1:12345")
self._u = blocks.udp_source(gr.sizeof_gr_complex, ip, int(port))
print("Using UDP source %s:%s" % (ip, port))
else:
self._u = blocks.file_source(gr.sizeof_gr_complex, options.source)
print("Using file source %s" % options.source)
print("Rate is %i" % (options.rate,))
def close(self):
self.stop()
self.wait()
self._sender.close()
self._u = None
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