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gr-satnogs
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Code Issues Releases Wiki Activity

Change NOAA filtering for reduced CPU utilization

This commit is contained in:
Manolis Surligas 2017-06-23 02:34:57 +03:00
parent 37b69933c0
commit e9f7051985
2 changed files with 15 additions and 15 deletions
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2
apps/flowgraphs/satellites/noaa_apt_decoder.grc
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@ -177,7 +177,7 @@ the quadrature demodulation</value>
</param>
<param>
<key>width</key>
<value>0.01</value>
<value>0.02</value>
</param>
<param>
<key>win</key>

28
apps/flowgraphs/satellites/satnogs_noaa_apt_decoder.py
View File

@ -5,7 +5,7 @@
# Title: NOAA APT Decoder
# Author: Manolis Surligas, George Vardakis
# Description: A NOAA APT Decoder with automatic image synchronization
# Generated: Tue Apr 11 00:15:28 2017
# Generated: Fri Jun 23 02:28:46 2017
##################################################
from gnuradio import analog
@ -23,26 +23,26 @@ import time
class satnogs_noaa_apt_decoder(gr.top_block):
def __init__(self, doppler_correction_per_sec=1000, lo_offset=100e3, ppm=0, rigctl_port=4532, rx_freq=90.4e6, rx_sdr_device='usrpb200', image_file_path='/tmp/noaa.png'):
def __init__(self, doppler_correction_per_sec=1000, image_file_path='/tmp/noaa.png', lo_offset=100e3, ppm=0, rigctl_port=4532, rx_freq=90.4e6, rx_sdr_device='usrpb200'):
gr.top_block.__init__(self, "NOAA APT Decoder")
##################################################
# Parameters
##################################################
self.doppler_correction_per_sec = doppler_correction_per_sec
self.image_file_path = image_file_path
self.lo_offset = lo_offset
self.ppm = ppm
self.rigctl_port = rigctl_port
self.rx_freq = rx_freq
self.rx_sdr_device = rx_sdr_device
self.image_file_path = image_file_path
##################################################
# Variables
##################################################
self.samp_rate_rx = samp_rate_rx = satnogs.hw_rx_settings[rx_sdr_device]['samp_rate']
self.noaa_filter_taps = noaa_filter_taps = firdes.low_pass(1.0, 1.0, 0.17, 0.01, firdes.WIN_HAMMING, 6.76)
self.noaa_filter_taps = noaa_filter_taps = firdes.low_pass(1.0, 1.0, 0.17, 0.02, firdes.WIN_HAMMING, 6.76)
self.initial_bandwidth = initial_bandwidth = 100e3
self.audio_decimation = audio_decimation = 2
@ -112,6 +112,12 @@ class satnogs_noaa_apt_decoder(gr.top_block):
def set_doppler_correction_per_sec(self, doppler_correction_per_sec):
self.doppler_correction_per_sec = doppler_correction_per_sec
def get_image_file_path(self):
return self.image_file_path
def set_image_file_path(self, image_file_path):
self.image_file_path = image_file_path
def get_lo_offset(self):
return self.lo_offset
@ -151,12 +157,6 @@ class satnogs_noaa_apt_decoder(gr.top_block):
self.osmosdr_source_0.set_bb_gain(satnogs.hw_rx_settings[self.rx_sdr_device]['bb_gain'], 0)
self.osmosdr_source_0.set_antenna(satnogs.hw_rx_settings[self.rx_sdr_device]['antenna'], 0)
def get_image_file_path(self):
return self.image_file_path
def set_image_file_path(self, image_file_path):
self.image_file_path = image_file_path
def get_samp_rate_rx(self):
return self.samp_rate_rx
@ -194,6 +194,9 @@ def argument_parser():
parser.add_option(
"", "--doppler-correction-per-sec", dest="doppler_correction_per_sec", type="intx", default=1000,
help="Set doppler_correction_per_sec [default=%default]")
parser.add_option(
"", "--image-file-path", dest="image_file_path", type="string", default='/tmp/noaa.png',
help="Set image_file_path [default=%default]")
parser.add_option(
"", "--lo-offset", dest="lo_offset", type="eng_float", default=eng_notation.num_to_str(100e3),
help="Set lo_offset [default=%default]")
@ -209,9 +212,6 @@ def argument_parser():
parser.add_option(
"", "--rx-sdr-device", dest="rx_sdr_device", type="string", default='usrpb200',
help="Set rx_sdr_device [default=%default]")
parser.add_option(
"", "--image-file-path", dest="image_file_path", type="string", default='/tmp/noaa.png',
help="Set image_file_path [default=%default]")
return parser
@ -219,7 +219,7 @@ def main(top_block_cls=satnogs_noaa_apt_decoder, options=None):
if options is None:
options, _ = argument_parser().parse_args()
tb = top_block_cls(doppler_correction_per_sec=options.doppler_correction_per_sec, lo_offset=options.lo_offset, ppm=options.ppm, rigctl_port=options.rigctl_port, rx_freq=options.rx_freq, rx_sdr_device=options.rx_sdr_device, image_file_path=options.image_file_path)
tb = top_block_cls(doppler_correction_per_sec=options.doppler_correction_per_sec, image_file_path=options.image_file_path, lo_offset=options.lo_offset, ppm=options.ppm, rigctl_port=options.rigctl_port, rx_freq=options.rx_freq, rx_sdr_device=options.rx_sdr_device)
tb.start()
tb.wait()