FGFS-4.1/gr-air-modes
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first stab at converting front end to use integrate & dump instead of cheesy "bit_energy" thing

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This commit is contained in:
Nick Foster
2011-05-30 20:26:58 -07:00
parent 46573db399
commit f86635430e
3 changed files with 17 additions and 6 deletions
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10
src/python/uhd_modes.py
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@@ -34,6 +34,7 @@ from modes_sql import modes_output_sql
from modes_sbs1 import modes_output_sbs1
from modes_kml import modes_kml
import gnuradio.gr.gr_threading as _threading
import numpy
class top_block_runner(_threading.Thread):
def __init__(self, tb):
@@ -87,13 +88,20 @@ class adsb_rx_block (gr.top_block):
pass_all = 1
self.demod = gr.complex_to_mag()
self.avg = gr.moving_average_ff(100, 1.0/100, 400);
self.avg = gr.moving_average_ff(100, 1.0/100, 400)
#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)
#this is an integrate-and-dump filter to act as a matched filter
self.filtcoeffs = list(numpy.ones(int(rate/2e6)))
#i think downstream blocks can therefore process at 2Msps -- try this
#self.filter = gr.fir_filter_fff(int(rate/2e6), self.filtcoeffs)
self.filter = gr.fir_filter_fff(1, self.filtcoeffs)
#rate = 2e6
self.preamble = air.modes_preamble(rate, options.threshold)
self.framer = air.modes_framer(rate)
self.slicer = air.modes_slicer(rate, queue)