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Thread: Can anyone help decode these messages?

  1. #21
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    Join Date
    Sep 2017
    Posts
    4
    Quote Originally Posted by szpajder View Post
    If you have some FANS logs at hand, then you don't need to read about, compile nor use dumpvdl2. Just get the sources, type "make decpdlc" and in a few minutes you should have a decpdlc binary ready in the current directory.

    Then type, for example:

    Code:
    ./decpdlc u /SMACAYA.AT1.A6-EQCE4A4845914C9625C241A5362C4C9640E4B00E8C3
    and it will spit out the decoded message.

    The first parameter "u" indicates that the following string should be decoded as an uplink message - so you have to know in which direction it has been sent (ground to aircraft or vice versa). Usually it should be pretty straightforward to figure this out from the ACARS log. Or just try "u" and then "d" blindly - it should work this way or another
    Thanks very much for your guidance I will get that one going , really appreciated and look forward to hear or see you back in any software ! thanks for the good work.

  2. #22
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    Join Date
    Jun 2015
    Posts
    4
    dumpvdl2 also decodes ADS-C.

    Downlinks:

    Code:
    A75F15 (Aircraft, Airborne) -> 2B86F7 (Ground station): Command
    AVLC type: I sseq: 3 rseq: 3 poll: 0
    ACARS:
    Reg: .N574UP Flight: UP0001
    Mode: 2 Label: H1 Blk id: 3 Ack: ! Msg no.: F24A
    Message:
    #M1B/B6 CTUE1YA.ADS.N574UP0725DE985D6A89472E1D9F0D24B3C0316CC5F749642476902FB70457800E5A40E1C000B67A
    ADS-C message:
     Basic report:
      Lat: 53.2539940
      Lon: 16.4207840
      Alt: 38000 ft
      Time: 2951.375 sec past hour (:49:11.375)
      Position accuracy: <0.05 nm
      NAV unit redundancy: OK
      TCAS: OK
     Predicted route:
      Next waypoint:
       Lat: 51.6123962
       Lon: 8.6879539
       Alt: 24436 ft
       ETA: 2404 sec
      Next+1 waypoint:
       Lat: 51.2762833
       Lon: 8.3873749
       Alt: 17784 ft
     Earth reference data:
      True track: 253.8 deg
      Ground speed: 451.5 kt
      Vertical speed: 0 ft/min
    and uplinks:

    Code:
    10920A (Ground station, On ground) -> 8963D9 (Aircraft): Command
    AVLC type: I sseq: 2 rseq: 4 poll: 0
    ACARS:
    Reg: .A6-EPJ Flight:
    Mode: 2 Label: A6 Blk id: B Ack: 2 Msg no.:
    Message:
    /DXBEGEK.ADS.A6-EPJ07550BCE5212
    
    ADS-C message:
     Periodic contract request:
      Contract number: 85
      Reporting interval: 896 seconds
    but there is no standalone decoder for ADS-C included. Only ADS-C payloads carried over VDL-2 are decoded.

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