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HFDL


(Overview)
(Overview)
Line 6: Line 6:
The HFDL service is operated by ARINC as GLOBALink service through a worldwide network of HF stations.
The HFDL service is operated by ARINC as GLOBALink service through a worldwide network of HF stations.
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The [http://www.chbrain.dircon.co.uk/pchfdl.html PC-HFDL] program is a Windows software to decode HF=DL data traffic and has been written by Charles Brain. Besides the commercial version there is an unsupported free version to download. Just feed the HF receiver speaker's output into the soundcard of a Windows PC running PC-HFDL.
+
The [http://www.chbrain.dircon.co.uk/pchfdl.html PC-HFDL] program is a Windows software to decode HFDL data traffic and has been written by Charles Brain. Besides the commercial version there is an unsupported free version to download. Just feed the HF receiver speaker's output into the soundcard of a Windows PC running PC-HFDL.
-
The best monitoring results will be achieved with the following PC-HFDL settings:
+
The best monitoring results will be achieved with the following PC-HFDL settings:<br>
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PREAM ON - to control the audio offset of the receiver
+
* PREAM ON - to control the audio offset of the receiver
-
SPDU OFF - only needed temporarily ON to see the squitters of a new unknown ground station
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* SPDU OFF - only needed temporarily ON to see the squitters of a new unknown ground station
-
MPDU ON - see the MPDU packets
+
* MPDU ON - see the MPDU packets
-
LPDU ON - see the LPDUs within the MPDUs
+
* LPDU ON - see the LPDUs within the MPDUs
-
BDU ON - see the BDUs
+
* BDU ON - see the BDUs
-
VERB ON - see more details
+
* VERB ON - see more details
-
HFNPDU ON - see the routine position reports
+
* HFNPDU ON - see the routine position reports
-
HEX OFF - only needed for debugging purposes
+
* HEX OFF - only needed for debugging purposes
So in short, with all options ON except SPDU and HEX, the complete session can be seen: LOG-ON of the aircraft to the ground station giving its 24bit ICAO-ID, the assignment of the 1byte sequence ID number to the given ICAO-ID by the ground station referenced in all subsequent traffic, clear distinction of MPDU packets containing more than just one LPDU, and full traffic details.
So in short, with all options ON except SPDU and HEX, the complete session can be seen: LOG-ON of the aircraft to the ground station giving its 24bit ICAO-ID, the assignment of the 1byte sequence ID number to the given ICAO-ID by the ground station referenced in all subsequent traffic, clear distinction of MPDU packets containing more than just one LPDU, and full traffic details.

Revision as of 23:51, 3 January 2006

Overview

HFDL is a HF data link protocol, defined in ARINC spec 635-3. The name is somewhat misleading, as HFDL actually describes a class of data signals; it is also referred to as HF ACARS.
Transmissions on HF are in USB on a sub carrier of 1440 Hz with a symbol speed of 1800 baud. Modulation is 2-PSK, 4-PSK or 8-PSK with effective bit rates of 300, 600, 1200 or 1800 bits/sec. The HFDL service is operated by ARINC as GLOBALink service through a worldwide network of HF stations.

The PC-HFDL program is a Windows software to decode HFDL data traffic and has been written by Charles Brain. Besides the commercial version there is an unsupported free version to download. Just feed the HF receiver speaker's output into the soundcard of a Windows PC running PC-HFDL.

The best monitoring results will be achieved with the following PC-HFDL settings:

  • PREAM ON - to control the audio offset of the receiver
  • SPDU OFF - only needed temporarily ON to see the squitters of a new unknown ground station
  • MPDU ON - see the MPDU packets
  • LPDU ON - see the LPDUs within the MPDUs
  • BDU ON - see the BDUs
  • VERB ON - see more details
  • HFNPDU ON - see the routine position reports
  • HEX OFF - only needed for debugging purposes

So in short, with all options ON except SPDU and HEX, the complete session can be seen: LOG-ON of the aircraft to the ground station giving its 24bit ICAO-ID, the assignment of the 1byte sequence ID number to the given ICAO-ID by the ground station referenced in all subsequent traffic, clear distinction of MPDU packets containing more than just one LPDU, and full traffic details.

Frequencies

Ground StationFrequencies in kHz
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
01 San Francisco CA, USA 21934 17919 13276 (11327)(10081) 8927 6559 5508 4672 (2947)                   
02 Molokai, HI, HWA 21937 21928 17934 (17919)(13276) 11348 11312 10081 8936 8912 6559 (5538) (5529) (5508) (5463) (3434) (3019) (3001) (2947) (2878)
03 Reykjavik, ISL 17985 15025 11184 8977 6712 5720 (3900) (3116)                       
04 Riverhead, NY, USA (21934) 21931 17934 (17919) 13276 11315 8912 (6652) (5523) 3428                    
05 Auckland, NZL (21949)(17916) 13351 (11327) 10084 (8921) 6535 5583 (3404) (3016)                   
06 Hat Yai, THA 21949 17928 13270 10066 8825 6535 (5655) (4687) (3470)                     
07 Shannon, IRL 11384 10081 8942 (8843) 6532 5547 (3455) (2998)                       
08 Johannesburg, AFS 21949 13321 8834 4681 3016                              
09 Barrow, AK, ALS (21937)(21928)(17934)(17919) 11354 (10093)(10027) 8936 (8928) 6646 5544 (5529) (4687) (4654) (3497) (3007) (2992) (2944)   
13 Santa Cruz, BOL 21997 (21988)(21973)(21946)(17916) 13315 11318 8957 (6628) (4660) (3467) (2983)               
14 Krasnoyarsk, RUS 13321 10087 (2905) (2878)                              
15 Al Muharraq, BHR 21982 17967 13354 11312 10075 8885 5544 (2986)                       
16 Agana, GUM (17934) 17919 13339 (13312)(13276) 11306 (11288) (8936) 8927 (8912) (6661) (6652) (6634) (6550)           
17 Telde, Gran Canaria, CNR 21955 17928 (13303) 11348 8948 6529 5589 2905                        

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