The sys admin's daily grind – Air traffic control
Plane Spotting
When he sees vapor trails in the skies above the Lower Rhine area, sys admin Charly Kühnast doesn't just dream of faraway places. With a Linux system and a DVB-T stick, he grabs the signals from jets flying overhead and tracks their courses on a map.
Most commercial aircraft have an Automatic Dependent Surveillance--Broadcast system on board; this is known as ADS-B for short. It constantly transmits the heading, altitude, speed, GPS position, and flight number on a frequency of 1,090MHz.
If you want to track the position of the jets yourself, you do not necessarily require an airport tower full of technology. All I needed was a Linux computer and a receiver for digital terrestrial television (a.k.a. a DVB-T stick for less than EUR 20, or about US$ 25); the stick uses the Realtek RTL 2832U chipset in conjunction with an E4000 or R820T tuner. In addition to this, I had two software components waiting on the runway: RTL-SDR and Dump1090.
RTL-SDR [1] supports communication with the DVB-T receiver, and Dump1090 [2] decodes the data obtained in this way using a mini-web server to display a map of the machines in the vicinity. Even if you do find the two components on your Linux system, the version is likely to be outdated. It thus makes sense to build the current versions yourself. The tools required for this are shown in the command in the first line of Listing 1. The following lines then fetch RTL-SDR and compile the RTL-2832U driver.
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