FGFS-4.1/gr-air-modes
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Merge remote-tracking branch 'jcorgan/pmf2'

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This commit is contained in:
Nick Foster
2012-10-29 17:56:25 -07:00
parent 4c986a70a4 7ad09f5b14
commit 3cfeb5d705
4 changed files with 35 additions and 9 deletions
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18
python/rx_path.py
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@@ -24,7 +24,7 @@ import air_modes_swig
class rx_path(gr.hier_block2):
def __init__(self, rate, threshold, queue):
def __init__(self, rate, threshold, queue, use_pmf=False):
gr.hier_block2.__init__(self, "modes_rx_path",
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(0,0,0))
@@ -32,12 +32,20 @@ class rx_path(gr.hier_block2):
self._rate = int(rate)
self._threshold = threshold
self._queue = queue
self._spc = int(rate/2e6)
# Convert incoming I/Q baseband to amplitude
self._demod = gr.complex_to_mag()
self._bb = self._demod
# Pulse matched filter for 0.5us pulses
if use_pmf:
self._pmf = gr.moving_average_ff(self._spc, 1.0/self._spc, self._rate)
self.connect(self._demod, self._pmf)
self._bb = self._pmf
# Establish baseline amplitude (noise, interference)
self._avg = gr.moving_average_ff(100, 1.0/100, 400) # FIXME
self._avg = gr.moving_average_ff(48*self._spc, 1.0/(48*self._spc), self._rate) # 3 preambles
# Synchronize to Mode-S preamble
self._sync = air_modes_swig.modes_preamble(self._rate, self._threshold)
@@ -45,6 +53,8 @@ class rx_path(gr.hier_block2):
# Slice Mode-S bits and send to message queue
self._slicer = air_modes_swig.modes_slicer(self._rate, self._queue)
self.connect(self, self._demod, (self._sync, 0))
self.connect(self._demod, self._avg, (self._sync, 1))
# Wire up the flowgraph
self.connect(self, self._demod)
self.connect(self._bb, (self._sync, 0))
self.connect(self._bb, self._avg, (self._sync, 1))
self.connect(self._sync, self._slicer)