Difference between revisions of "Decode Telemetry and Packets"
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There are several tools available to decode telemetry and packets. SatNOGS provides some built-in demodulators for various data formats. There are also additional tools that allow you the decoding of telemetry. | There are several tools available to decode telemetry and packets. SatNOGS provides some built-in demodulators for various data formats. There are also additional tools that allow you the decoding of telemetry. | ||
| − | == Built-in demodulators == | + | ==Built-in demodulators== |
<p>[[File:SatNOGS-Observation-Data.png]]</p> | <p>[[File:SatNOGS-Observation-Data.png]]</p> | ||
Although the SatNOGS servers support many satellites with many modes, only the following modes are supported with built-in demodulators: | Although the SatNOGS servers support many satellites with many modes, only the following modes are supported with built-in demodulators: | ||
| − | * [[APT]] (Automatic Picture Transmission) | + | *[[APT]] (Automatic Picture Transmission) |
| − | * [[AFSK]] 1k2 (Audio Frequency Shift Keying) | + | *[[AFSK]] 1k2 (Audio Frequency Shift Keying) |
| − | * AX.25 (Amateur Radio adaptation of X.25 packet protocol) | + | *AX.25 (Amateur Radio adaptation of X.25 packet protocol) |
| − | * [[CW]] (Continuous Wave, Morse Code) | + | *[[CW]] (Continuous Wave, Morse Code) |
| − | * [[DUV]] (Data Under Voice) | + | *[[DUV]] (Data Under Voice) |
| − | * [[GFSK]] 9k6 (Gaussian Frequency Shift Keying) | + | *[[GFSK]] 9k6 (Gaussian Frequency Shift Keying) |
| − | * [[FSK]] 9k6 (Frequency Shift Keying) | + | *[[FSK]] 9k6 (Frequency Shift Keying) |
| − | * [[LRPT]] (Low Resolution Picture Transmission) | + | *[[LRPT]] (Low Resolution Picture Transmission) |
| − | == External demodulator/decoders == | + | ==External demodulator/decoders== |
If for some reason, the above built-in decoders are not doing enough, there are many [[Satellite specific telemetry decoders]]. Also, there are more generic decoders listed below. | If for some reason, the above built-in decoders are not doing enough, there are many [[Satellite specific telemetry decoders]]. Also, there are more generic decoders listed below. | ||
| − | == SoX - Sound eXchange == | + | ==SoX - Sound eXchange== |
SoX is the Swiss Army knife of sound processing programs. SoX is cross-platform and is available for many operating systems (Windows, Linux, MacOS X, etc.). | SoX is the Swiss Army knife of sound processing programs. SoX is cross-platform and is available for many operating systems (Windows, Linux, MacOS X, etc.). | ||
SoX supports demodulating the following modes: | SoX supports demodulating the following modes: | ||
| − | |||
| − | === References === | + | *[[SoX_CW|CW]] (Continuous Wave, Morse Code) |
| − | * Chris Bagwell SoX − Sound eXchange http://sox.sourceforge.net/sox.html | + | |
| + | ===References=== | ||
| + | |||
| + | *Chris Bagwell SoX − Sound eXchange http://sox.sourceforge.net/sox.html | ||
| − | == Fldigi in audio playback mode == | + | ==Fldigi in audio playback mode== |
Fldigi can be used to decode a variety of data modes. | Fldigi can be used to decode a variety of data modes. | ||
| − | * [[Fldigi_CW|CW]] (Continuous Wave, Morse Code) | + | *[[Fldigi_CW|CW]] (Continuous Wave, Morse Code) |
| − | == FoxTelem for FOX1 series satellites == | + | ==FoxTelem for FOX1 series satellites== |
[[FoxTelem]] currently supports decoding DUV telemetry the following satellites: | [[FoxTelem]] currently supports decoding DUV telemetry the following satellites: | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | === References === | + | *AO-85 (Fox-1A) |
| − | * AC2CZ FoxTelem - AMSAT Ground Station Software http://www.g0kla.com/foxtelem/ | + | *AO-91 (Radfxsat / Fox1-B) |
| + | *AO-92 (Fox1-D) | ||
| + | *Fox-1Cliff, and | ||
| + | *Fox-1E. | ||
| + | |||
| + | ===References=== | ||
| + | |||
| + | *AC2CZ FoxTelem - AMSAT Ground Station Software http://www.g0kla.com/foxtelem/ | ||
| − | == multimon-ng == | + | ==multimon-ng== |
Multimon-ng is a general purpose decoder. It can take wav or raw files and decode | Multimon-ng is a general purpose decoder. It can take wav or raw files and decode | ||
a variety of modes among which: CW, AFSK, FSK... | a variety of modes among which: CW, AFSK, FSK... | ||
| − | === How to CW === | + | ===How to CW=== |
First you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file: <br> | First you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file: <br> | ||
sox file.ogg -r 22050 file.raw gain 6 <br> | sox file.ogg -r 22050 file.raw gain 6 <br> | ||
| Line 57: | Line 61: | ||
multimon-ng -a MORSE_CW -t raw file.raw | multimon-ng -a MORSE_CW -t raw file.raw | ||
| − | === How to AFSK === | + | ===How to AFSK=== |
First convert to raw sound file (sampling frequency 22050Hz) using sox <br> | First convert to raw sound file (sampling frequency 22050Hz) using sox <br> | ||
| Line 67: | Line 71: | ||
You can add more decoders if needed with additionnal "-a" options | You can add more decoders if needed with additionnal "-a" options | ||
| − | === References === | + | ===References=== |
| − | * Elia Oenal Multimon-ng https://github.com/EliasOenal/multimon-ng | + | |
| + | *Elia Oenal Multimon-ng https://github.com/EliasOenal/multimon-ng | ||
| − | == Direwolf == | + | ==Direwolf== |
Direwolf is a software encoder/decoder for APRS (AX.25). It can take raw files and decode APRS. | Direwolf is a software encoder/decoder for APRS (AX.25). It can take raw files and decode APRS. | ||
| − | === How to === | + | ===How to=== |
First you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file <br> | First you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file <br> | ||
sox file.ogg -esigned-integer -b 16 -r 48000 file.raw <br> | sox file.ogg -esigned-integer -b 16 -r 48000 file.raw <br> | ||
| Line 86: | Line 91: | ||
([https://community.libre.space/t/observation-386252-x-cubesat-42707/3093/2 source]) | ([https://community.libre.space/t/observation-386252-x-cubesat-42707/3093/2 source]) | ||
| − | == QSSTV == | + | ==QSSTV== |
[http://users.telenet.be/on4qz/qsstv/index.html QSSTV] is a modem software to send and receive SSTV | [http://users.telenet.be/on4qz/qsstv/index.html QSSTV] is a modem software to send and receive SSTV | ||
([https://en.wikipedia.org/wiki/Slow-scan_television Slow Scan Television]). | ([https://en.wikipedia.org/wiki/Slow-scan_television Slow Scan Television]). | ||
| + | |||
| + | ===Usage=== | ||
| + | |||
| + | *Download the ogg file and convert it to wav with: <br /> <nowiki>sox satnogs_154162_2018-06-06T12-46-40.ogg output154162.wav rate 48000</nowiki> | ||
| + | |||
| + | *Open QSSTV and specify "Sound>Sound Input: from file" | ||
| + | *Press the play button and you will be asked to select the previously generated wav file. The decoding should start now. | ||
| + | |||
| + | ===References=== | ||
| + | Direwolf WB2OSZ https://github.com/wb2osz/direwolf | ||
| + | |||
| + | <br /> | ||
| + | |||
| + | == WXtoImg == | ||
| + | |||
| + | |||
| + | WXtoImg is a program used to produce neat weather pictures from APT format receptions of NOAA satellites. | ||
| + | |||
| + | It uses a wav file and produces weather picture with possible nice overlays (frontiers, colors...). | ||
=== Usage === | === Usage === | ||
| − | |||
| − | * | + | * Download for example the ogg file from observation #1193773 and convert it to wav with: |
| − | * | + | |
| + | sox satnogs/satnogs_1193773_2019-11-12T07-13-50.ogg -r 11025 satnogs/satnogs_1193773_2019-11-12T07-13-50.wav | ||
| + | |||
| + | * Then invoke command line interface of WXtoIMG with: | ||
| + | |||
| + | wxtoimg -t n -e HVC -N satnogs/satnogs_1193773_2019-11-12T07-13-50.wav > satnogs/satnogs_1193773_2019-11-12T07-13-50.png | ||
| + | <br /> | ||
=== References === | === References === | ||
| − | + | WXtoImg restored: https://wxtoimgrestored.xyz/ | |
| − | + | <br /> | |
| − | == Scholarly Articles == | + | ==Scholarly Articles== |
[[Category:Telemetry]] | [[Category:Telemetry]] | ||
__NOEDITSECTION__ | __NOEDITSECTION__ | ||
Revision as of 10:59, 12 November 2019
There are several tools available to decode telemetry and packets. SatNOGS provides some built-in demodulators for various data formats. There are also additional tools that allow you the decoding of telemetry.
Contents
Built-in demodulators
Although the SatNOGS servers support many satellites with many modes, only the following modes are supported with built-in demodulators:
- APT (Automatic Picture Transmission)
- AFSK 1k2 (Audio Frequency Shift Keying)
- AX.25 (Amateur Radio adaptation of X.25 packet protocol)
- CW (Continuous Wave, Morse Code)
- DUV (Data Under Voice)
- GFSK 9k6 (Gaussian Frequency Shift Keying)
- FSK 9k6 (Frequency Shift Keying)
- LRPT (Low Resolution Picture Transmission)
External demodulator/decoders
If for some reason, the above built-in decoders are not doing enough, there are many Satellite specific telemetry decoders. Also, there are more generic decoders listed below.
SoX - Sound eXchange
SoX is the Swiss Army knife of sound processing programs. SoX is cross-platform and is available for many operating systems (Windows, Linux, MacOS X, etc.).
SoX supports demodulating the following modes:
- CW (Continuous Wave, Morse Code)
References
- Chris Bagwell SoX − Sound eXchange http://sox.sourceforge.net/sox.html
Fldigi in audio playback mode
Fldigi can be used to decode a variety of data modes.
- CW (Continuous Wave, Morse Code)
FoxTelem for FOX1 series satellites
FoxTelem currently supports decoding DUV telemetry the following satellites:
- AO-85 (Fox-1A)
- AO-91 (Radfxsat / Fox1-B)
- AO-92 (Fox1-D)
- Fox-1Cliff, and
- Fox-1E.
References
- AC2CZ FoxTelem - AMSAT Ground Station Software http://www.g0kla.com/foxtelem/
multimon-ng
Multimon-ng is a general purpose decoder. It can take wav or raw files and decode a variety of modes among which: CW, AFSK, FSK...
How to CW
First you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file:
sox file.ogg -r 22050 file.raw gain 6
The gain is in dB and has a considerable impact on the decoding
in the special case of CW. You have to adjust gain to get proper decoding.
Then you must apply on the raw file the proper decoder:
multimon-ng -a MORSE_CW -t raw file.raw
How to AFSK
First convert to raw sound file (sampling frequency 22050Hz) using sox
sox -t ogg $file -r 22050 -t raw file.raw $soxopts
Then use multimon-ng with AFSK1200 decoder
multimon-ng -t raw -a AFSK1200 $file.raw
You can add more decoders if needed with additionnal "-a" options
References
- Elia Oenal Multimon-ng https://github.com/EliasOenal/multimon-ng
Direwolf
Direwolf is a software encoder/decoder for APRS (AX.25). It can take raw files and decode APRS.
How to
First you have to use sox to convert ogg files from SatNOGS download to 22050Hz raw file
sox file.ogg -esigned-integer -b 16 -r 48000 file.raw
then launch direwolf
direwolf -B 1200 -b 16 -n 1 -r 48000 -q hd -t 0 -q h -q d -d p -d t -a 0 - < file.raw
Both commands can be combined with a pipe:
sox -t ogg satnogs_386252_2018-12-29T02-54-45.ogg -esigned-integer -b 16 -r 48000 -t raw - | direwolf -B 1200 -b 16 -n 1 -r 48000 -q hd -t 0 -q h -q d -d p -d t -a 0 -
(source)
QSSTV
QSSTV is a modem software to send and receive SSTV (Slow Scan Television).
Usage
- Download the ogg file and convert it to wav with:
sox satnogs_154162_2018-06-06T12-46-40.ogg output154162.wav rate 48000
- Open QSSTV and specify "Sound>Sound Input: from file"
- Press the play button and you will be asked to select the previously generated wav file. The decoding should start now.
References
Direwolf WB2OSZ https://github.com/wb2osz/direwolf
WXtoImg
WXtoImg is a program used to produce neat weather pictures from APT format receptions of NOAA satellites.
It uses a wav file and produces weather picture with possible nice overlays (frontiers, colors...).
Usage
- Download for example the ogg file from observation #1193773 and convert it to wav with:
sox satnogs/satnogs_1193773_2019-11-12T07-13-50.ogg -r 11025 satnogs/satnogs_1193773_2019-11-12T07-13-50.wav
- Then invoke command line interface of WXtoIMG with:
wxtoimg -t n -e HVC -N satnogs/satnogs_1193773_2019-11-12T07-13-50.wav > satnogs/satnogs_1193773_2019-11-12T07-13-50.png
References
WXtoImg restored: https://wxtoimgrestored.xyz/
