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Manolis Surligas 5501c237cf Adapt FSK AX.25 flowgraph to gr-soapy 
* Adapt FSK AX.25 flowgraph to gr-soapy
* Drop the MSK flowgraph. From now on, for both MSK
and FSK the satnogs_fsk_ax25.py should be used
 		2019-12-20 13:00:58 +02:00
..
satellites Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
README.md Add example flowgraph and documentation 2018-04-27 11:32:07 +03:00
afsk1200_ax25.grc Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
bpsk_ax25.grc Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
cw_decoder.grc Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
example_flowgraph.grc Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
fm_demod.grc Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
fsk_ax25.grc Adapt FSK AX.25 flowgraph to gr-soapy 2019-12-20 13:00:58 +02:00
satnogs_afsk1200_ax25.py Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
satnogs_bpsk_ax25.py Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
satnogs_cw_decoder.py Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
satnogs_example_flowgraph.py Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
satnogs_fm_demod.py Remove obsolete flowgraphs 2019-09-30 19:32:21 +03:00
satnogs_fsk_ax25.py Adapt FSK AX.25 flowgraph to gr-soapy 2019-12-20 13:00:58 +02:00

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: The rigctld port
  • --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.