62304ff59e
This commit creates air_modes.rx_path, which is the common portion of the flowgraph once the sample source and possible resampler are created. It takes baseband I/Q and emits Mode-S packets into the supplied message queue.
238 lines
8.7 KiB
Python
Executable File
238 lines
8.7 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2010 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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my_position = None
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from gnuradio import gr, gru, optfir, eng_notation, blks2
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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import time, os, sys, threading
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from string import split, join
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import air_modes
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import gnuradio.gr.gr_threading as _threading
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import csv
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from air_modes.exceptions import *
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class top_block_runner(_threading.Thread):
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def __init__(self, tb):
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_threading.Thread.__init__(self)
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self.setDaemon(1)
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self.tb = tb
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self.done = False
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self.start()
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def run(self):
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self.tb.run()
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self.done = True
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class adsb_rx_block (gr.top_block):
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def __init__(self, options, args, queue):
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gr.top_block.__init__(self)
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self.options = options
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self.args = args
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rate = int(options.rate)
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use_resampler = False
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if options.filename is None and options.udp is None and not options.rtlsdr:
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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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time_spec = uhd.time_spec(0.0)
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self.u.set_time_now(time_spec)
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#if(options.rx_subdev_spec is None):
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# options.rx_subdev_spec = ""
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#self.u.set_subdev_spec(options.rx_subdev_spec)
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if not options.antenna is None:
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self.u.set_antenna(options.antenna)
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self.u.set_samp_rate(rate)
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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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if not(self.tune(options.freq)):
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print "Failed to set initial frequency"
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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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elif options.rtlsdr: #RTLSDR dongle
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import osmosdr
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self.u = osmosdr.source_c(options.args)
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self.u.set_sample_rate(3.2e6) #fixed for RTL dongles
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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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use_resampler = True
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else:
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if options.filename is not None:
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self.u = gr.file_source(gr.sizeof_gr_complex, options.filename)
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elif options.udp is not None:
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self.u = gr.udp_source(gr.sizeof_gr_complex, "localhost", options.udp)
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else:
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raise Exception("No valid source selected")
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print "Rate is %i" % (rate,)
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pass_all = 0
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if options.output_all :
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pass_all = 1
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self.rx_path = air_modes.rx_path(rate, options.threshold, queue)
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if use_resampler:
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self.lpfiltcoeffs = gr.firdes.low_pass(1, 5*3.2e6, 1.6e6, 300e3)
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self.resample = blks2.rational_resampler_ccf(interpolation=5, decimation=4, taps=self.lpfiltcoeffs)
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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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def tune(self, freq):
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result = self.u.set_center_freq(freq, 0)
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return result
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def printraw(msg):
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print msg
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if __name__ == '__main__':
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usage = "%prog: [options] output filename"
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parser = OptionParser(option_class=eng_option, usage=usage)
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parser.add_option("-R", "--rx-subdev-spec", type="string",
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help="select USRP Rx side A or B", metavar="SUBDEV")
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parser.add_option("-A", "--antenna", type="string",
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help="select which antenna to use on daughterboard")
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parser.add_option("-D", "--args", type="string",
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help="arguments to pass to UHD/RTL constructor", default="")
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parser.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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parser.add_option("-g", "--gain", type="int", default=None,
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help="set RF gain", metavar="dB")
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parser.add_option("-r", "--rate", type="eng_float", default=4000000,
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help="set ADC sample rate [default=%default]")
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parser.add_option("-T", "--threshold", type="eng_float", default=5.0,
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help="set pulse detection threshold above noise in dB [default=%default]")
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parser.add_option("-a","--output-all", action="store_true", default=False,
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help="output all frames")
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parser.add_option("-F","--filename", type="string", default=None,
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help="read data from file instead of USRP")
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parser.add_option("-K","--kml", type="string", default=None,
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help="filename for Google Earth KML output")
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parser.add_option("-P","--sbs1", action="store_true", default=False,
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help="open an SBS-1-compatible server on port 30003")
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parser.add_option("-w","--raw", action="store_true", default=False,
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help="open a server outputting raw timestamped data on port 9988")
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parser.add_option("-n","--no-print", action="store_true", default=False,
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help="disable printing decoded packets to stdout")
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parser.add_option("-l","--location", type="string", default=None,
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help="GPS coordinates of receiving station in format xx.xxxxx,xx.xxxxx")
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parser.add_option("-u","--udp", type="int", default=None,
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help="Use UDP source on specified port")
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parser.add_option("-m","--multiplayer", type="string", default=None,
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help="FlightGear server to send aircraft data, in format host:port")
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parser.add_option("-d","--rtlsdr", action="store_true", default=False,
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help="Use RTLSDR dongle instead of UHD source")
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(options, args) = parser.parse_args()
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if options.location is not None:
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reader = csv.reader([options.location], quoting=csv.QUOTE_NONNUMERIC)
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my_position = reader.next()
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queue = gr.msg_queue()
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outputs = [] #registry of plugin output functions
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updates = [] #registry of plugin update functions
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if options.raw is True:
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rawport = air_modes.raw_server(9988) #port
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outputs.append(rawport.output)
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outputs.append(printraw)
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updates.append(rawport.add_pending_conns)
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if options.kml is not None:
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#we spawn a thread to run every 30 seconds (or whatever) to generate KML
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dbname = 'adsb.db'
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lock = threading.Lock()
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sqldb = air_modes.output_sql(my_position, dbname, lock) #input into the db
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kmlgen = air_modes.output_kml(options.kml, dbname, my_position, lock) #create a KML generating thread to read from the db
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outputs.append(sqldb.output)
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if options.sbs1 is True:
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sbs1port = air_modes.output_sbs1(my_position, 30003)
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outputs.append(sbs1port.output)
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updates.append(sbs1port.add_pending_conns)
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if options.no_print is not True:
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outputs.append(air_modes.output_print(my_position).output)
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if options.multiplayer is not None:
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[fghost, fgport] = options.multiplayer.split(':')
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fgout = air_modes.output_flightgear(my_position, fghost, int(fgport))
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outputs.append(fgout.output)
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fg = adsb_rx_block(options, args, queue)
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runner = top_block_runner(fg)
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while 1:
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try:
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#the update registry is really for the SBS1 and raw server plugins -- we're looking for new TCP connections.
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#i think we have to do this here rather than in the output handler because otherwise connections will stack up
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#until the next output arrives
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for update in updates:
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update()
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#main message handler
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if not queue.empty_p() :
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while not queue.empty_p() :
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msg = queue.delete_head() #blocking read
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for out in outputs:
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try:
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out(msg.to_string())
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except air_modes.ADSBError:
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pass
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elif runner.done:
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raise KeyboardInterrupt
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else:
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time.sleep(0.1)
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except KeyboardInterrupt:
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fg.stop()
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runner = None
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if options.kml is not None:
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kmlgen.done = True
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break
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