lib1090

This is a Mode S, ADS-B, TIS-B and ADS-R decoding library for Java. It was forked from the OpenSky Network's (http://www.opensky-network.org) java-adsb library and refactored entirely to accommodate TIS-B and ADS-R.

It is based on these two references:

• ICAO Aeronautical Telecommunications Annex 10 Volume 4 (Surveillance Radar and Collision Avoidance Systems)
• RTCA DO-260B "Minimum Operational Performance Standards (MOPS) for 1090ES"

It supports the following Mode S downlink formats:

• DF 0: Short air-air ACAS
• DF 4: Short altitude reply
• DF 5: Short identify reply
• DF 11: All-call reply
• DF 16: Long air-air ACAS
• DF 17/18: Extended Squitter (see ADS-B formats below)
• DF 19: Military Extended Squitter
• DF 20: Comm-B altitude reply
• DF 21: Comm-B identify reply
• DF >24: Comm-D Extended Length Message

The following ADS-B formats are supported:

• BDS 0,5: Airborne position messages (including global and local CPR)
• BDS 0,6: Surface position messages (including global and local CPR)
• BDS 0,8: Identification messages
• BDS 0,9: Airborne velocity messages
• BDS 6,1: Aircraft status reports (emergency/priority, TCAS RA)
• BDS 6,2: Target state and status messages
• BDS 6,5: Operational status reports (airborne and surface)

The formats are implemented according to RTCA DO-260B, i.e. ADS-B Version 2. The decoder properly takes care of older versions.

Basic support for the following Comm-B registers is implemented:

• BDS 1,0: Data link capability
• BDS 1,7: Common usage GICB capability
• BDS 2,0: Identification
• BDS 3,0: ACAS resolution advisory
• BDS 4,0: Selected vertical intention
• BDS 5,0: Track and turn report
• BDS 6,0: Heading and speed report

The type of the Comm-B register cannot be inferred from the message itself. As a passive observer, who does not know the interrogation, some rule-based (or more sophisticated) approach needs to be applied to derive the type and instantiate the correct decoder class. This has not yet been implemented in the StatefulModeSDecoder. If required, users of this library need to explicitly call the correct Comm-B message decoder.

The Comm-D data link and military ES are not parsed.

Packaging

This is a Maven project. You can simply generate a jar file with mvn package. All the output can afterwards be found in the target directory. There will be two jar files

• lib1090-VERSION.jar contains lib1090, only.
• lib1090-VERSION-fat.jar includes lib1090 and all its dependencies.

Maven Central

We have also published this project on Maven Central. Just include the following dependency in your project:

<dependency>
  <groupId>de.sero-systems</groupId>
  <artifactId>lib1090</artifactId>
  <version>VERSION</version>
</dependency>

Get the latest version number here.