Add a BPSK decoder script for frames transmitted in AX.25, using G3RUH
scrambling and without. Baudrate is set via parameter "baudrate", all
filters, taps, offsets, etc are calculated using this parameter. Decoder
tested with 1k2 bps and 9k6 bps.
* Set all decoders output to binary format
* Introduce the quadrature demodulation filter in all affected
flowgraphs, in order to reduce false alarms and increase performance
There are cases where in AFSK1200 mode, the transmit source uses the
G3RUH scrambling. Now the flowgraph implements both scrambled and
unscrambled decoders, so there is no need to descriminate between
scrambled and unscrambled satellites.
The CMake build system will first try to locate libfec in the system. if
it is not available, it will start building the libfec that is part of
the gr-satnogs source code. During the installation libfec is installed
in the system, thus future builds will make use of it and will not
rebuild from source.
Seems that there is a probleb with general blocks and the history, so
the filter cannot act as valve. However, it produces zeros, in the
presence of noise.
This is an attempt to cut the signal free period after the quadrature
demodulation block. The idea seems that works, but there still an issue
with the samples not passing correctly from the valve.
* Set the METEOR flowgraph in non-X mode
* Reduce the stored bandwidth by a factor of 2. Captures have shown that
twice the bandwidth of the METEOR is enough for RRC and clock recovery
This commit adds a inital METEOR flowgraph that can be used for
capturing raw IQ. The capturing is performed in a sampling rate of
320KSPS which is more than enough for actual decoding for both METEOR
modes (72K and 80K). Due to icnreased bandwidth no audio file is
generated.