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TOPIC: DF17 vs DF18

DF17 vs DF18 1 year 4 weeks ago #923

  • schlapi
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ADS-B OUT on 1090ES by aircraft are typically sent by a transponder in the DF17 message.

There is a separate by quite similar DF18 message used:
  • by airborne non-transponder ADS-B OUT devices (more and more of those coming into the market; don't yet know if they fulfil the US mandate)
  • by ground, to uplink SSR-traffic, as TIS-B
  • by ground, to uplink ADS-B traffic from other data links (mainly UAT), as ADS-R

  • Does OpenSky process also DF18?
    How do I know if DF17 or 18?
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DF17 vs DF18 1 year 4 weeks ago #924

  • schaefer
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We also process DF 18 messages:
github.com/openskynetwork/java-adsb/blob...odeSDecoder.java#L58
However, there is currently no way to distinguish whether the information came from a DF17 or 18 message from a user perspective.
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DF17 vs DF18 1 year 4 weeks ago #925

  • schlapi
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Thank you.

So this was committed by fixje on 21 Aug 2018, and since then should be in the data?

Suggest you introduce a distinction feature between the messages.
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