DF17 vs DF18

3 years 3 months ago #923 by schlapi
DF17 vs DF18 was created by schlapi
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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3 years 3 months ago #924 by schaefer
Replied by schaefer on topic DF17 vs DF18
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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3 years 3 months ago #925 by schlapi
Replied by schlapi on topic DF17 vs DF18
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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