Decoding the airspace above you with Java and $7 hardware - Bert Jan Schrijver

Nov 18, 20140 likes743 views

Software-defined radio (SDR) is een radio-communicatiesysteem waarbij een deel van de componenten niet als hardware maar als software geïmplementeerd zijn. Goedkope digitale TV-ontvangers werken vaak op die manier. Bepaalde chipsets die veel voor dat soort ontvangers gebruikt worden zijn zelfs dusdanig generiek dat je ze softwarematig op een frequentie naar keuze kunt afstemmen. En dat is waar het leuk begint te worden: met de juiste software kun je niet alleen TV ontvangen maar ook portofoons, scheepvaartverkeer, en.. signalen van ADS-B transponders van commercieel vliegverkeer. In deze sessie laat ik zien hoe je met een USB-stick van 7 dollar ADS-B berichten van vliegtuigen kunt ontvangen. Ik leg uit hoe je die data met een Java-applicatie kunt verwerken en kunt visualiseren via de Google maps API. Het eindresultaat is een webapplicatie die een actuele weergave van het vliegverkeer boven Nederland geeft.

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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Decoding the airspace above you with Java and $7 hardware - Bert Jan Schrijver

1. Decoding the airspace above you with Java and $7 hardware Bert Jan Schrijver [email protected] @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