9d41d8986c
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. |
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|---|---|---|
| .. | ||
| satellites | ||
| README.md | ||
| afsk1200_ax25.grc | ||
| apt_demod.grc | ||
| ax25_transceiver_qt.grc | ||
| bpsk_decoder.grc | ||
| bpsk_demod.grc | ||
| cw_decoder.grc | ||
| debug_afsk_transceiver_osmocom.py | ||
| device_args_handler.py | ||
| example_flowgraph.grc | ||
| fm_demod.grc | ||
| fsk9600_ax25.grc | ||
| fsk9600_g3ruh_ax25.grc | ||
| generic_iq_receiver.grc | ||
| satnogs_afsk1200_ax25.py | ||
| satnogs_apt_demod.py | ||
| satnogs_bpsk_decoder.py | ||
| satnogs_bpsk_demod.py | ||
| satnogs_cw_decoder.py | ||
| satnogs_example_flowgraph.py | ||
| satnogs_fm_demod.py | ||
| satnogs_fsk9600_ax25.py | ||
| satnogs_fsk9600_g3ruh_ax25.py | ||
| satnogs_generic_iq_receiver.py | ||
README.md
SatNOGS flowgraphs
This directory contains all the available flowgraphs that can be executed from
the satnogs-client.
Contribution guide
Flowgraphs are placed inside the apps/flowgraphs directory.
If a decoding flowgraph targets only specific satellite/mission, the
flowgraph should be placed inside the apps/flowgraphs/satellites directory.
Each flowgraph should have a representative name (eg voyager_decoder) and
both the GNU Radio file (.grc) and the generated pythons script should be available.
Python auto-generared flowgraph scripts should have the satnogs_ prefix.
This can be performed by setting properly the ID field of the Options block
of the flowgraph.
For example the voyager_decoder.grc should generate a python executable named
satnogs_voyager_decoder.py
NOTE:: Custom python GNU Radio scripts are not allowed.
Each flowgraph should be able to be generated from the corresponding .grc file.
All generated python scripts should be installed using the CMake build system.
To do so, edit properly the apps/CMakeLists.txt or apps/flowgraphs/satellites/CMakeLists.txt file.
In the apps/flowgraphs directory, the is an example flowgraph called example_flowgraph.grc
that can be used as a base.
Execution arguements interface
The stanogs-client and the gr-satnogs communicate through a set of
predefined command line arguments.
Depending the decoding flowgraph, additional arguments may exist or missing.
However, there is a set of mandatory arguments.
--antenna: The name of the antenna to use--dev-args: SDR device specific arguments--bb-gain: Baseband gain--if-gain: Intermediate frequency gain--rf-gain: RF gain--ppm: The PPM correction--rx-freq: RX frequency--rx-sdr-device: The RX SDR device identification name (e.g uhd, airspy, etc)--rigctl-port: Therigctldport--doppler-correction-per-sec: Number of Doppler corrections per second--lo-offset: Offset from the desired center frequency. The flowgraph should tune the SDR with this offset from the center frequency and digitally compensate it. This eliminate the problem of the DC leakage, expressed in the majority of the SDR devices.