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Manolis Surligas 767e4e3d38 Redesign of the AX.25 decoder 
This commits introduces a significant redesign of the AX.25 decoding
block. Due to the poor AX.25 sync flag, the decoders exhibited too many
false alarms. To deal with this problem, we introduced the quadrature
demod filter block, that tried to measure the SNR based on the running
variance of the signal. The problem with that was that the user should
have to fine tune two parameters, the one related with the amplitude of
the incoming signal and the second one related with the window that the
calculations should take place. This solution worked until now, but we
can always increase the performance.

The new AX.25 decoder stores the bitstream in a queue and always tries
to exlpoit possible valid frames in the queue. If now sync flags have
been encountered, the queue is flushed. After a valid frame extraction,
bits corresponding to this frame are also deleted from the queue.

This technique requires more memory and CPU, but it increases a lot the
decoding performance.
 		2019-07-18 16:39:26 +03:00
..
CMakeLists.txt Remove unneeded link references to gnuradio libs 2018-12-03 02:14:58 +02:00
ax25_decoder_bm_impl.cc Redesign of the AX.25 decoder 2019-07-18 16:39:26 +03:00
ax25_decoder_bm_impl.h Redesign of the AX.25 decoder 2019-07-18 16:39:26 +03:00
ax25_encoder_mb_impl.cc Fix AX.25 encoder/decoder 2018-03-20 20:40:13 +02:00
ax25_encoder_mb_impl.h Fix AX.25 encoder/decoder 2018-03-20 20:40:13 +02:00
ccsds_rs_decoder_mm_impl.cc Fix 8b10b decoding process 2018-03-24 21:43:19 +02:00
ccsds_rs_decoder_mm_impl.h Improve 8b10b decoder performance and add the CCSDS RS decoder 2018-03-24 21:43:18 +02:00
coarse_doppler_correction_cc_impl.cc Fix Doppler shift direction (#43) 2016-11-22 11:49:42 +02:00
coarse_doppler_correction_cc_impl.h Add coarse doppler shift correction block 2016-05-11 21:17:58 +03:00
convolutional_deinterleaver.cc Add convolutional deinterleaver 2018-11-24 00:25:32 +02:00
cw_encoder_impl.cc Finish the CW encoder 2017-11-01 22:04:56 +02:00
cw_encoder_impl.h Finish the CW encoder 2017-11-01 22:04:56 +02:00
cw_to_symbol_impl.cc Improve CW decoding 2019-01-06 20:14:32 +02:00
cw_to_symbol_impl.h Improve CW decoding 2019-01-06 20:14:32 +02:00
debug_msg_source_impl.cc Add new debug message source that can accept raw bytes 2016-06-02 17:06:40 +03:00
debug_msg_source_impl.h Finish the AX.25 decoder and add a UDP message source block 2016-03-08 23:19:17 +02:00
debug_msg_source_raw_impl.cc Add new debug message source that can accept raw bytes 2016-06-02 17:06:40 +03:00
debug_msg_source_raw_impl.h Add new debug message source that can accept raw bytes 2016-06-02 17:06:40 +03:00
decoder_8b10b_impl.cc Improve DUV decoder sensitivity 2018-07-30 14:05:23 +03:00
decoder_8b10b_impl.h Improve DUV decoder sensitivity 2018-07-30 14:05:23 +03:00
doppler_correction_cc_impl.cc Fix Doppler shift direction (#43) 2016-11-22 11:49:42 +02:00
doppler_correction_cc_impl.h Continue working on the Doppler Correction block 2016-03-30 21:51:19 +03:00
doppler_fit.cc Continue working on the Doppler Correction block 2016-03-30 21:51:19 +03:00
fox_telem_mm_impl.cc Fix formatting 2018-10-27 20:44:41 +03:00
fox_telem_mm_impl.h Add block for parsing the FOX slow speed telemetry frames 2018-03-24 21:43:19 +02:00
frame_acquisition_impl.cc Improve the generic frame acquisition 2018-12-03 01:42:14 +02:00
frame_acquisition_impl.h Improve the generic frame acquisition 2018-12-03 01:42:14 +02:00
frame_encoder_impl.cc Merge branch 'next' of https://github.com/satnogs/gr-satnogs into next 2016-03-29 22:59:36 +03:00
frame_encoder_impl.h Merge branch 'next' of https://github.com/satnogs/gr-satnogs into next 2016-03-29 22:59:36 +03:00
frame_file_sink_impl.cc Make consistent the format of the message sink 2018-03-20 20:44:36 +02:00
frame_file_sink_impl.h Fix bug with gcc<5 and minor changes to filenames 2017-08-02 18:06:21 +03:00
freq_drift.cc Merge branch 'next' of https://github.com/satnogs/gr-satnogs into next 2016-03-29 22:59:36 +03:00
golay24.cc Implement Golay (24, 12, 8) encoder/decoder 2018-11-30 15:08:17 +02:00
iq_sink_impl.cc Improve DUV decoder sensitivity 2018-07-30 14:05:23 +03:00
iq_sink_impl.h Improve DUV decoder sensitivity 2018-07-30 14:05:23 +03:00
lrpt_decoder_impl.cc Add LRPT decoding flowgraph 2018-11-24 00:25:32 +02:00
lrpt_decoder_impl.h Add LRPT decoding flowgraph 2018-11-24 00:25:32 +02:00
lrpt_sync_impl.cc Add LRPT decoding flowgraph 2018-11-24 00:25:32 +02:00
lrpt_sync_impl.h Add LRPT decoding flowgraph 2018-11-24 00:25:32 +02:00
morse_debug_source_impl.cc Window number to dot duration should be sufficient enough 2017-11-01 22:04:56 +02:00
morse_debug_source_impl.h Window number to dot duration should be sufficient enough 2017-11-01 22:04:56 +02:00
morse_decoder_impl.cc Improve CW decoding 2019-01-06 20:14:32 +02:00
morse_decoder_impl.h Improve CW decoding 2019-01-06 20:14:32 +02:00
morse_tree.cc Improve CW decoding process 2017-11-01 22:04:56 +02:00
multi_format_msg_sink_impl.cc Make consistent the format of the message sink 2018-03-20 20:44:36 +02:00
multi_format_msg_sink_impl.h Output messages in text files 2017-11-01 22:04:56 +02:00
noaa_apt_sink_impl.cc Fixed slating issues caused by NaN samples 2018-07-18 12:25:53 +03:00
noaa_apt_sink_impl.h Reinstate stop function 2018-02-02 18:44:32 +02:00
ogg_encoder_impl.cc Fix OGG encoder issues 2017-02-03 01:24:10 +02:00
ogg_encoder_impl.h Fix OGG encoder issues 2017-02-03 01:24:10 +02:00
ogg_source_impl.cc Several minor improvements 2018-01-21 22:23:22 +02:00
ogg_source_impl.h Several minor improvements 2018-01-21 22:23:22 +02:00
qb50_deframer_impl.cc Add the QB50 deframer block 2016-07-27 17:38:49 +03:00
qb50_deframer_impl.h Add the QB50 deframer block 2016-07-27 17:38:49 +03:00
quad_demod_filter_ff_impl.cc Change the quadrature demod filter to sync block 2018-03-24 21:43:18 +02:00
quad_demod_filter_ff_impl.h Change the quadrature demod filter to sync block 2018-03-24 21:43:18 +02:00
shift_reg.cc Improve the generic frame acquisition 2018-12-03 01:42:14 +02:00
tcp_rigctl_msg_source_impl.cc Fix compiler warning when printing uint64_t 2018-12-03 02:14:58 +02:00
tcp_rigctl_msg_source_impl.h Add supoort to the rigctl message source to work as client 2016-10-22 19:34:09 +03:00
udp_msg_sink_impl.cc Add UDP PMT message sink block 2016-04-29 02:21:00 +03:00
udp_msg_sink_impl.h Add UDP PMT message sink block 2016-04-29 02:21:00 +03:00
udp_msg_source_impl.cc Fix missing break statement 2017-02-03 19:25:53 +02:00
udp_msg_source_impl.h Dev (#53) 2017-01-22 19:33:36 +02:00
upsat_fsk_frame_acquisition_impl.cc Support fixed packet length frames on the FSK decoder 2017-04-15 02:41:47 +03:00
upsat_fsk_frame_acquisition_impl.h Support fixed packet length frames on the FSK decoder 2017-04-15 02:41:47 +03:00
upsat_fsk_frame_encoder_impl.cc Merge branch 'next' of https://github.com/satnogs/gr-satnogs into next 2016-06-30 23:44:05 +03:00
upsat_fsk_frame_encoder_impl.h AX.25 support at the UPSAT FSK encoder/decoder 2016-04-29 21:43:09 +03:00
waterfall_sink_impl.cc Dev (#53) 2017-01-22 19:33:36 +02:00
waterfall_sink_impl.h Dev (#53) 2017-01-22 19:33:36 +02:00
whitening.cc Improve the generic frame acquisition 2018-12-03 01:42:14 +02:00