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Automatic dependent surveillance-broadcast (ADS-B). The principal source is a large number of ground based ADS-B receivers, which collect data from any aircraft in their local area that are equipped with an ADS-B transponder and feed this data to the internet in real time. The aircraft-based transponders use the GPS and other flight data input to transmit signals containing aircraft registration, position, altitude, velocity and other flight data. Currently, about 65% of aircraft in Europe are equipped with ADS-B but only 35% in the US. For example: all Airbus aircraft are ADS-B equipped but Boeing 707, 717, 727, 737-200, 747-100, 747-200, 747SP do not come equipped and are not generally visible unless retrofitted by their operators. Typical ADS-B receivers include Kinetic Avonics′s SBS-1 and AirNav-systems's AirNav and these receivers are run by volunteers, mostly aviation enthusiasts. ADS-B signals can also be received and uploaded by a low-cost Software-defined radio, such as those based on the $15 R820T tuner.[4]
Multilateration (MLAT). The second major source is multilateration using Flightradar24 (FR24) receivers. All aircraft types will be visible in areas covered by MLAT, even without ADS-B, but while 99% of Europe is covered, only parts of the US are. At least four receivers are needed to calculate the position of an aircraft.[3]
Federal Aviation Administration. The shortfall in the US is mostly made up from 5 minute delayed data from the Federal Aviation Administration (FAA) but this may not include aircraft registration and other information.
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