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Tom Swartz 2016-10-17 11:17:02 -04:00
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@ -1,9 +1,9 @@
# ACARSDEC # ACARSDEC
Acarsdec is an open source, realtime ACARS demodulator and position decoder for Linux.
Aircraft Communication Addressing and Reporting System (or ACARS) is a digital datalink system for transmission of small messages between aircraft and ground stations via VHF radio. Aircraft Communication Addressing and Reporting System (or ACARS) is a digital datalink system for transmission of small messages between aircraft and ground stations via VHF radio.
Acarsdec is an open source, realtime ACARS demodulator and position decoder for Linux.
## HOW DOES IT WORK ? ## HOW DOES IT WORK ?
To receive ACARS you need at least an AM VHF air band receiver tuned to one of these frequencies: To receive ACARS you need at least an AM VHF air band receiver tuned to one of these frequencies:
@ -17,10 +17,10 @@ To receive ACARS you need at least an AM VHF air band receiver tuned to one of t
(These frequencies are the most common, Google is your friend for other frequencies) (These frequencies are the most common, Google is your friend for other frequencies)
Audio output from this receiver is send to the soundcard input of your PC under Linux. Audio output from this receiver is send to the soundcard input of your PC under Linux.
Then, acarsdec will demodulate the signals sent by aircrafts and print the received messages on its standart output in airnav log text format. Then, acarsdec will demodulate the signals sent by aircraft and print the received messages on its standard output in airnav log text format.
## BUILDING IT ## BUILDING IT
On a Linux system, you will need libsnd librairy, alsa audio system and gcc/make installed. On a Linux system, you will need libsnd library, alsa audio system and gcc/make installed.
Then just type: Then just type:
`make` `make`
@ -36,7 +36,7 @@ acarsdec [-LR][-s noport] -d alsapcmdevice | -f sndfile
``` ```
Input could be mono or stereo but with 48Khz sampling frequency. Input could be mono or stereo but with 48Khz sampling frequency.
If stereo, acarsdec will demod the 2 channels independantly (if no L ou R options specified) If stereo, acarsdec will demod the 2 channels independently (if no L or R options specified)
Typical usage for realtime decoding is : Typical usage for realtime decoding is :
`acarsdec -d hw:0` `acarsdec -d hw:0`
@ -49,19 +49,20 @@ Save as wav file, then decode it by:
## USING IT WITH XASTIR ## USING IT WITH XASTIR
acarsdec have a special output mode to use it with APRS position reporting plotting program : [xastir](www.xastir.org). acarsdec have a special output mode to use it with APRS position reporting plotting program: [xastir](www.xastir.org).
In this mode, acarsdec acts as a very basic local aprsd server. In this mode, acarsdec acts as a very basic local aprsd server.
ACARS messages, and in particular, position report messages are converted to APRS format, so you can plot aircraft positions on a map. ACARS messages, and in particular, position report messages are converted to APRS format, so you can plot aircraft positions on a map.
PS: position decoding is in experimental stage. Mail me if you find errors or lack of position reporting. PS: position decoding is in experimental stage. Mail me if you find errors or lack of position reporting.
start acarsdec with the following option : Start acarsdec with the following option:
`acarsdec -d hw:0 -s 14000` `acarsdec -d hw:0 -s 14000`
Then in xastir, choose: Then in xastir, choose:
- Interface → Interface Control → Add - Interface → Interface Control → Add
- Select: Internet Server, then Add - Select: Internet Server, then Add
- Set Host at 127.0.0.1, Port 14000, Don't allow transmitting, then Ok. - Set Host at 127.0.0.1, Port 14000, Don't allow transmitting, then OK.
This will add an interface in the Interface Control dialog. This will add an interface in the Interface Control dialog.