Fix BPSK issue on low baudrates
This commit is contained in:
Manolis Surligas
parent
c77ca2fe98
commit
0d21c5942f
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@ -609,7 +609,8 @@
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</param>
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<param>
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<key>comment</key>
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<value>Add a frequency offset to move the audio
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<value>Add a frequency offset of 1200 Hz
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to move the audio
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a bit higher than 0.</value>
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</param>
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<param>
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@ -1302,7 +1303,7 @@ we shift the LO a little further</value>
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</param>
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<param>
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<key>cutoff_freq</key>
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<value>((1.0 + excess_bw) * baudrate/2.0) + max_cfo</value>
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<value>((1.0 + excess_bw) * baudrate/2.0) + min(baudrate, abs(max_cfo))</value>
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</param>
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<param>
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<key>decim</key>
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@ -1350,7 +1351,7 @@ we shift the LO a little further</value>
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</param>
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<param>
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<key>width</key>
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<value>baudrate / 16.0</value>
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<value>baudrate / 10.0</value>
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</param>
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<param>
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<key>win</key>
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@ -1377,7 +1378,7 @@ we shift the LO a little further</value>
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</param>
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<param>
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<key>cutoff_freq</key>
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<value>((1.0 + excess_bw) * baudrate/2.0) + max_cfo</value>
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<value>((1.0 + excess_bw) * baudrate/2.0) + min(baudrate, abs(max_cfo))</value>
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</param>
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<param>
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<key>decim</key>
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@ -1425,7 +1426,7 @@ we shift the LO a little further</value>
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</param>
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<param>
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<key>width</key>
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<value>baudrate / 16.0</value>
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<value>baudrate / 10.0</value>
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</param>
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<param>
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<key>win</key>
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@ -5,7 +5,7 @@
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# Title: satnogs_bpsk_ax25
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# Author: Manolis Surligas (surligas@gmail.com), Patrick Dohmen (DL4PD)
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# Description: BPSK AX.25 decoder
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# Generated: Tue Nov 27 16:45:38 2018
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# Generated: Fri Dec 21 16:45:19 2018
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##################################################
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from gnuradio import analog
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@ -26,7 +26,7 @@ import time
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class satnogs_bpsk_ax25(gr.top_block):
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def __init__(self, antenna=satnogs.not_set_antenna, baudrate=9600.0, bb_gain=satnogs.not_set_rx_bb_gain, decoded_data_file_path='/tmp/.satnogs/data/data', dev_args=satnogs.not_set_dev_args, doppler_correction_per_sec=1000, enable_iq_dump=0, file_path='test.wav', if_gain=satnogs.not_set_rx_if_gain, iq_file_path='/tmp/iq.dat', lo_offset=100e3, ppm=0, rf_gain=satnogs.not_set_rx_rf_gain, rigctl_port=4532, rx_freq=100e6, rx_sdr_device='usrpb200', samp_rate_rx=satnogs.not_set_samp_rate_rx, udp_IP='127.0.0.1', udp_port=16887, waterfall_file_path='/tmp/waterfall.dat', excess_bw=0.35, max_cfo=1000.0):
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def __init__(self, antenna=satnogs.not_set_antenna, baudrate=9600.0, bb_gain=satnogs.not_set_rx_bb_gain, decoded_data_file_path='/tmp/.satnogs/data/data', dev_args=satnogs.not_set_dev_args, doppler_correction_per_sec=1000, enable_iq_dump=0, excess_bw=0.35, file_path='test.wav', if_gain=satnogs.not_set_rx_if_gain, iq_file_path='/tmp/iq.dat', lo_offset=100e3, max_cfo=1000.0, ppm=0, rf_gain=satnogs.not_set_rx_rf_gain, rigctl_port=4532, rx_freq=100e6, rx_sdr_device='usrpb200', samp_rate_rx=satnogs.not_set_samp_rate_rx, udp_IP='127.0.0.1', udp_port=16887, waterfall_file_path='/tmp/waterfall.dat'):
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gr.top_block.__init__(self, "satnogs_bpsk_ax25")
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##################################################
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@ -39,10 +39,12 @@ class satnogs_bpsk_ax25(gr.top_block):
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self.dev_args = dev_args
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self.doppler_correction_per_sec = doppler_correction_per_sec
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self.enable_iq_dump = enable_iq_dump
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self.excess_bw = excess_bw
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self.file_path = file_path
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self.if_gain = if_gain
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self.iq_file_path = iq_file_path
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self.lo_offset = lo_offset
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self.max_cfo = max_cfo
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self.ppm = ppm
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self.rf_gain = rf_gain
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self.rigctl_port = rigctl_port
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@ -52,8 +54,6 @@ class satnogs_bpsk_ax25(gr.top_block):
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self.udp_IP = udp_IP
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self.udp_port = udp_port
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self.waterfall_file_path = waterfall_file_path
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self.excess_bw = excess_bw
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self.max_cfo = max_cfo
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##################################################
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# Variables
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@ -104,9 +104,9 @@ class satnogs_bpsk_ax25(gr.top_block):
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self.osmosdr_source_0.set_bandwidth(satnogs.handle_samp_rate_rx(rx_sdr_device, samp_rate_rx), 0)
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self.low_pass_filter_0_0 = filter.fir_filter_ccf(1, firdes.low_pass(
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1, audio_samp_rate, ((1.0 + excess_bw) * baudrate/2.0) + max_cfo, baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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1, audio_samp_rate, ((1.0 + excess_bw) * baudrate/2.0) + min(baudrate, abs(max_cfo)), baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0 = filter.fir_filter_ccf(1, firdes.low_pass(
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1, sps*baudrate, ((1.0 + excess_bw) * baudrate/2.0) + max_cfo, baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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1, sps*baudrate, ((1.0 + excess_bw) * baudrate/2.0) + min(baudrate, abs(max_cfo)), baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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self.digital_pfb_clock_sync_xxx_0 = digital.pfb_clock_sync_ccf(sps, 2.0 * math.pi/100.0, (rrc_taps), nfilts, nfilts/2, 1.5, 1)
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self.digital_costas_loop_cc_0_0 = digital.costas_loop_cc(2.0 * math.pi / 100.0, 2, True)
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self.digital_constellation_receiver_cb_0 = digital.constellation_receiver_cb(bpsk_constellation, 2.0 * math.pi/100.0, -0.25, 0.25)
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@ -160,8 +160,8 @@ class satnogs_bpsk_ax25(gr.top_block):
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def set_baudrate(self, baudrate):
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self.baudrate = baudrate
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self.pfb_arb_resampler_xxx_0_0.set_rate((1.0 * self.sps*self.baudrate)/satnogs.handle_samp_rate_rx(self.rx_sdr_device, self.samp_rate_rx))
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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def get_bb_gain(self):
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return self.bb_gain
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@ -194,6 +194,15 @@ class satnogs_bpsk_ax25(gr.top_block):
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def set_enable_iq_dump(self, enable_iq_dump):
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self.enable_iq_dump = enable_iq_dump
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def get_excess_bw(self):
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return self.excess_bw
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def set_excess_bw(self, excess_bw):
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self.excess_bw = excess_bw
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self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), self.excess_bw, 11*self.sps*self.nfilts))
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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def get_file_path(self):
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return self.file_path
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@ -221,6 +230,14 @@ class satnogs_bpsk_ax25(gr.top_block):
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self.osmosdr_source_0.set_center_freq(self.rx_freq - self.lo_offset, 0)
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self.blocks_rotator_cc_0.set_phase_inc(-2.0 * math.pi * (self.lo_offset / satnogs.handle_samp_rate_rx(self.rx_sdr_device, self.samp_rate_rx)))
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def get_max_cfo(self):
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return self.max_cfo
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def set_max_cfo(self, max_cfo):
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self.max_cfo = max_cfo
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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def get_ppm(self):
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return self.ppm
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@ -293,23 +310,6 @@ class satnogs_bpsk_ax25(gr.top_block):
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def set_waterfall_file_path(self, waterfall_file_path):
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self.waterfall_file_path = waterfall_file_path
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def get_excess_bw(self):
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return self.excess_bw
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def set_excess_bw(self, excess_bw):
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self.excess_bw = excess_bw
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self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), self.excess_bw, 11*self.sps*self.nfilts))
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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def get_max_cfo(self):
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return self.max_cfo
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def set_max_cfo(self, max_cfo):
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self.max_cfo = max_cfo
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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def get_sps(self):
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return self.sps
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@ -317,7 +317,7 @@ class satnogs_bpsk_ax25(gr.top_block):
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self.sps = sps
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self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), self.excess_bw, 11*self.sps*self.nfilts))
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self.pfb_arb_resampler_xxx_0_0.set_rate((1.0 * self.sps*self.baudrate)/satnogs.handle_samp_rate_rx(self.rx_sdr_device, self.samp_rate_rx))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.sps*self.baudrate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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def get_nfilts(self):
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return self.nfilts
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@ -345,7 +345,7 @@ class satnogs_bpsk_ax25(gr.top_block):
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def set_audio_samp_rate(self, audio_samp_rate):
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self.audio_samp_rate = audio_samp_rate
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self.pfb_arb_resampler_xxx_0.set_rate(self.audio_samp_rate/satnogs.handle_samp_rate_rx(self.rx_sdr_device, self.samp_rate_rx))
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + self.max_cfo, self.baudrate / 16.0, firdes.WIN_HAMMING, 6.76))
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self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, ((1.0 + self.excess_bw) * self.baudrate/2.0) + min(self.baudrate, abs(self.max_cfo)), self.baudrate / 10.0, firdes.WIN_HAMMING, 6.76))
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self.blocks_rotator_cc_0_0.set_phase_inc(2.0 * math.pi * (1200.0 / self.audio_samp_rate))
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@ -373,6 +373,9 @@ def argument_parser():
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parser.add_option(
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"", "--enable-iq-dump", dest="enable_iq_dump", type="intx", default=0,
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help="Set enable_iq_dump [default=%default]")
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parser.add_option(
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"", "--excess-bw", dest="excess_bw", type="eng_float", default=eng_notation.num_to_str(0.35),
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help="Set excess_bw [default=%default]")
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parser.add_option(
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"", "--file-path", dest="file_path", type="string", default='test.wav',
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help="Set file_path [default=%default]")
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@ -385,6 +388,9 @@ def argument_parser():
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parser.add_option(
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"", "--lo-offset", dest="lo_offset", type="eng_float", default=eng_notation.num_to_str(100e3),
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help="Set lo_offset [default=%default]")
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parser.add_option(
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"", "--max-cfo", dest="max_cfo", type="eng_float", default=eng_notation.num_to_str(1000.0),
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help="Set max_cfo [default=%default]")
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parser.add_option(
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"", "--ppm", dest="ppm", type="intx", default=0,
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help="Set ppm [default=%default]")
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@ -412,12 +418,6 @@ def argument_parser():
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parser.add_option(
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"", "--waterfall-file-path", dest="waterfall_file_path", type="string", default='/tmp/waterfall.dat',
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help="Set waterfall_file_path [default=%default]")
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parser.add_option(
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"", "--excess-bw", dest="excess_bw", type="eng_float", default=eng_notation.num_to_str(0.35),
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help="Set excess_bw [default=%default]")
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parser.add_option(
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"", "--max-cfo", dest="max_cfo", type="eng_float", default=eng_notation.num_to_str(1000.0),
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help="Set max_cfo [default=%default]")
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return parser
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@ -425,7 +425,7 @@ def main(top_block_cls=satnogs_bpsk_ax25, options=None):
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if options is None:
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options, _ = argument_parser().parse_args()
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tb = top_block_cls(antenna=options.antenna, baudrate=options.baudrate, bb_gain=options.bb_gain, decoded_data_file_path=options.decoded_data_file_path, dev_args=options.dev_args, doppler_correction_per_sec=options.doppler_correction_per_sec, enable_iq_dump=options.enable_iq_dump, file_path=options.file_path, if_gain=options.if_gain, iq_file_path=options.iq_file_path, lo_offset=options.lo_offset, ppm=options.ppm, rf_gain=options.rf_gain, rigctl_port=options.rigctl_port, rx_freq=options.rx_freq, rx_sdr_device=options.rx_sdr_device, samp_rate_rx=options.samp_rate_rx, udp_IP=options.udp_IP, udp_port=options.udp_port, waterfall_file_path=options.waterfall_file_path, excess_bw=options.excess_bw, max_cfo=options.max_cfo)
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tb = top_block_cls(antenna=options.antenna, baudrate=options.baudrate, bb_gain=options.bb_gain, decoded_data_file_path=options.decoded_data_file_path, dev_args=options.dev_args, doppler_correction_per_sec=options.doppler_correction_per_sec, enable_iq_dump=options.enable_iq_dump, excess_bw=options.excess_bw, file_path=options.file_path, if_gain=options.if_gain, iq_file_path=options.iq_file_path, lo_offset=options.lo_offset, max_cfo=options.max_cfo, ppm=options.ppm, rf_gain=options.rf_gain, rigctl_port=options.rigctl_port, rx_freq=options.rx_freq, rx_sdr_device=options.rx_sdr_device, samp_rate_rx=options.samp_rate_rx, udp_IP=options.udp_IP, udp_port=options.udp_port, waterfall_file_path=options.waterfall_file_path)
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tb.start()
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tb.wait()
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