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  • Oblivian
    replied
    Probably different types.

    Need to decode the start to find the message format. Some are replies to ground interrogation, some are Mode-S only, some then send ES (more data)

    http://bibliotheek.knmi.nl/knmipubTR/TR336.pdf

    Message type
    Downlink Format
    Content
    ADS-B (56 bits)
    DF0 Short air to air ACAS (BDS 0.E)
    DF4 Surveillance altitude
    DF5 Surveillance identity
    DF11 Mode-S only all call reply
    ADS-B ES (112 bits)
    DF17 Airborne position (BDS 0.5)
    Surface position (BDS 0.6)
    Extended squitter status (BDS 0.7)
    Aircraft type and ID (BDS 0.8)
    Airborne velocity (BDS 0.9)

    Leave a comment:


  • citylayer
    replied
    Why are there 2 different Lenght of messages?
    I can now understand the longer messages, but the shorter does not make any sense for me.
    Which data are send within the shorter message?

    Leave a comment:


  • citylayer
    replied
    Thanks for the link.

    Leave a comment:


  • Oblivian
    replied
    https://www.google.co.nz/url?sa=t&so...cM2fhXYj8LdQWB

    Page 6. You can break it up and enter into windows calculator in decimal mode and change it to binary.

    It's how we can decode us hex into expected registration

    Sent from my XT1092 using Tapatalk

    Leave a comment:


  • citylayer
    started a topic Raw Data Format

    Raw Data Format

    I would like to decode the Raw data format on port 30002 (dump1090) for private use.

    @022908C312908F4BB84CEA4A5864011C088A741D;
    @022908C87FFC5D4B1882016F50;
    @022908CABF9C8D06A1019911F39230042E3210D7;

    Is there any format description for this format?
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