FGFS-4.1/gr-air-modes
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First stab at tagged timestamps using TR's tagging branch. Currently segfaults due to some oddness in the tag subsystem.

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This commit is contained in:
Nick Foster
2010-11-18 14:25:07 -08:00
parent d23530615f
commit eb18bdc308
4 changed files with 87 additions and 29 deletions
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52
src/python/uhd_modes.py
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@@ -54,11 +54,11 @@ class adsb_rx_block (gr.top_block):
self.args = args
if options.filename is None:
self.u = uhd.simple_source("", uhd.io_type_t.COMPLEX_FLOAT32)
self.u = uhd.single_usrp_source("", uhd.io_type_t.COMPLEX_FLOAT32)
if(options.rx_subdev_spec is None):
options.rx_subdev_spec = ""
self.u.set_subdev_spec(options.rx_subdev_spec)
#if(options.rx_subdev_spec is None):
# options.rx_subdev_spec = ""
#self.u.set_subdev_spec(options.rx_subdev_spec)
rate = options.rate
self.u.set_samp_rate(rate)
@@ -66,7 +66,7 @@ class adsb_rx_block (gr.top_block):
if options.gain is None: #set to halfway
g = self.u.get_gain_range()
options.gain = (g.min+g.max) / 2.0
options.gain = (g.start()+g.stop()) / 2.0
if not(self.tune(options.freq)):
print "Failed to set initial frequency"
@@ -89,34 +89,38 @@ class adsb_rx_block (gr.top_block):
#the DBSRX especially tends to be spur-prone; the LPF keeps out the
#spur multiple that shows up at 2MHz
self.filtcoeffs = gr.firdes.low_pass(1, rate, 1.8e6, 200e3)
self.filter = gr.fir_filter_fff(1, self.filtcoeffs)
# self.filtcoeffs = gr.firdes.low_pass(1, rate, 1.8e6, 200e3)
# self.filter = gr.fir_filter_fff(1, self.filtcoeffs)
self.preamble = air.modes_preamble(rate, options.threshold)
self.framer = air.modes_framer(rate)
self.slicer = air.modes_slicer(rate, queue)
self.connect(self.u, self.demod, self.filter)
self.connect(self.filter, self.avg)
self.connect(self.filter, (self.preamble, 0))
self.connect(self.avg, (self.preamble, 1))
self.connect(self.filter, (self.framer, 0))
self.connect(self.preamble, (self.framer, 1))
self.connect(self.filter, (self.slicer, 0))
self.connect(self.framer, (self.slicer, 1))
#self.nullsink = gr.file_sink(gr.sizeof_gr_complex, "/dev/null")
#self.connect(self.u, self.nullsink)
# self.connect(self.u, self.demod, self.filter)
# self.connect(self.filter, self.avg)
# self.connect(self.filter, (self.preamble, 0))
# self.connect(self.avg, (self.preamble, 1))
# self.connect(self.filter, (self.framer, 0))
# self.connect(self.preamble, (self.framer, 1))
# self.connect(self.filter, (self.slicer, 0))
# self.connect(self.framer, (self.slicer, 1))
#use this flowgraph instead to omit the filter
# self.connect(self.u, self.demod)
# self.connect(self.demod, self.avg)
# self.connect(self.demod, (self.preamble, 0))
# self.connect(self.avg, (self.preamble, 1))
# self.connect(self.demod, (self.framer, 0))
# self.connect(self.preamble, (self.framer, 1))
# self.connect(self.demod, (self.slicer, 0))
# self.connect(self.framer, (self.slicer, 1))
self.connect(self.u, self.demod)
self.connect(self.demod, self.avg)
self.connect(self.demod, (self.preamble, 0))
self.connect(self.avg, (self.preamble, 1))
self.connect(self.demod, (self.framer, 0))
self.connect(self.preamble, (self.framer, 1))
self.connect(self.demod, (self.slicer, 0))
self.connect(self.framer, (self.slicer, 1))
def tune(self, freq):
result = self.u.set_center_freq(freq)
result = self.u.set_center_freq(freq, 0)
return result
if __name__ == '__main__':