J-Fall 2014: Decoding the airspace above you with Java and $7 hardware

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Bert Jan Schrijver

Github repository with example code: http://github.com/bertjan/java-adsb-receiver

Internet

Decoding the airspace
above you
with Java and $7 hardware
Bert Jan Schrijver
bertjan@jpoint.nl
@bjschrijver

Outline
• Background
• Software Defined Radio
• About ADS-B
• Decoding ADS-B
• Demo
@bjschrijver

TL;DR
• Now -> planes & Java
• Afterwards -> free beer (at the bar)
@bjschrijver

Software Defined Radio
• Radio communication system
• Components implemented in software
• Cheap DVB-T with RTL2832U chip ($7)
• Hence: RTL-SDR
• Details on www.rtl-sdr.com
@bjschrijver

Software Defined Radio
@bjschrijver
Demo

Java and RTL-SDR
• RTL_TCP: Provides socket for RTL-SDR
device
• Java can connect, set frequency and
stream data
• Decode data signal in Java
• First try: AIS (ship traffic)
• First tries never succeed…
@bjschrijver

ADS-B
• Automatic Dependent Surveillance
Broadcast
• Monitoring and collision avoidance
• Installed on all airliners
• Reports identity, position and more
• Part of US and EU regulation
@bjschrijver

Java and ADS-B
• Java connects to RTL_TCP socket
• But now what?
• No open source Java decoders
available
• No other option than to write own
decoder… or is there?
@bjschrijver

That’s cool, but…
• In-house reception is sub-optimal
• Always-on service would be nice
• Laptop needed for work now and then
@bjschrijver

We love data
• Keep system running for a while
• Nicely stocked MongoDB
• Now what?
• Visualize it!
@bjschrijver

Thanks for your time!
Please care about
conference quality.

Liked it?
Tweet it!
@bjschrijver
bertjan@jpoint.nl

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J-Fall 2014: Decoding the airspace above you with Java and $7 hardware

1. Decoding the airspace above you with Java and $7 hardware Bert Jan Schrijver bertjan@jpoint.nl @bjschrijver

2. Outline • Background • Software Defined Radio • About ADS-B • Decoding ADS-B • Demo @bjschrijver

3. TL;DR • Now -> planes & Java • Afterwards -> free beer (at the bar) @bjschrijver

4. How it all started… @bjschrijver

5. Software Defined Radio • Radio communication system • Components implemented in software • Cheap DVB-T with RTL2832U chip ($7) • Hence: RTL-SDR • Details on www.rtl-sdr.com @bjschrijver

6. Software Defined Radio @bjschrijver Demo

7. So how about Java? @bjschrijver

8. Java and RTL-SDR • RTL_TCP: Provides socket for RTL-SDR device • Java can connect, set frequency and stream data • Decode data signal in Java • First try: AIS (ship traffic) • First tries never succeed… @bjschrijver

9. ADS-B • Automatic Dependent Surveillance Broadcast • Monitoring and collision avoidance • Installed on all airliners • Reports identity, position and more • Part of US and EU regulation @bjschrijver

10. ADS-B @bjschrijver Source: simflight.nl

11. Java and ADS-B • Java connects to RTL_TCP socket • But now what? • No open source Java decoders available • No other option than to write own decoder… or is there? @bjschrijver

12. (insert legal notice here) @bjschrijver

13. How stuff works @bjschrijver

14. @bjschrijver Demo! o/

15. How stuff works @bjschrijver

16. That’s cool, but… • In-house reception is sub-optimal • Always-on service would be nice • Laptop needed for work now and then @bjschrijver

17. Getting serious @bjschrijver

18. We love data • Keep system running for a while • Nicely stocked MongoDB • Now what? • Visualize it! @bjschrijver

19. Antenna range @bjschrijver

20. 1 hour of data @bjschrijver

21. 2 hours @bjschrijver

22. 4 hours @bjschrijver

23. 8 hours @bjschrijver