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Decoding the airspace 
above you 
with Java and $7 hardware 
Bert Jan Schrijver 
bertjan@jpoint.nl 
@bjschrijver
How it all started… 
@bjschrijver
Software Defined Radio 
• Radio communication system 
• Components implemented in software 
@bjschrijver
Software Defined Radio 
• Cheap DVB-T with RTL2832U chip ($7) 
• Hence: RTL-SDR 
• Details on www.rtl-sdr.com 
@bjschrijver
@bjschrijver 
Amateur radio
@bjschrijver 
Wireless mic
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 
@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
ADS-B 
@bjschrijver 
Source: simflight.nl
Java and ADS-B 
• Java connects to RTL_TCP socket 
• But now what? 
• No open source Java decoders 
available 
@bjschrijver
Java and ADS-B 
• So what are our options? 
• Use C implementation 
• Write own decoder 
• … 
@bjschrijver
How stuff works 
@bjschrijver
How stuff works 
@bjschrijver
Mini-demo 
@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
Getting serious 
@bjschrijver
Antenna range 
@bjschrijver
8 hours of flight data 
@bjschrijver
16 hours 
@bjschrijver
Liked it? 
Tweet it! 
@bjschrijver 
bertjan@jpoint.nl 
github.com/bertjan

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