51 lines
1.8 KiB
Python
51 lines
1.8 KiB
Python
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#
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# Copyright 2012 Corgan Labs
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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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from gnuradio import gr
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import air_modes_swig
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class rx_path(gr.hier_block2):
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def __init__(self, rate, threshold, queue):
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gr.hier_block2.__init__(self, "modes_rx_path",
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gr.io_signature(1, 1, gr.sizeof_gr_complex),
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gr.io_signature(0,0,0))
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self._rate = int(rate)
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self._threshold = threshold
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self._queue = queue
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# Convert incoming I/Q baseband to amplitude
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self._demod = gr.complex_to_mag()
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# Establish baseline amplitude (noise, interference)
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self._avg = gr.moving_average_ff(100, 1.0/100, 400) # FIXME
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# Synchronize to Mode-S preamble
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self._sync = air_modes_swig.modes_preamble(self._rate, self._threshold)
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# Slice Mode-S bits and send to message queue
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self._slicer = air_modes_swig.modes_slicer(self._rate, self._queue)
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self.connect(self, self._demod, (self._sync, 0))
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self.connect(self._demod, self._avg, (self._sync, 1))
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self.connect(self._sync, self._slicer)
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