Also known as: FAA, Federal Aviation Administration
FAA (the Federal Aviation Administration) is the United States Department of Transportation agency that regulates civil aviation and operates the National Airspace System, including air traffic control. Its NextGen modernisation drove the US ADS-B mandate, carried on Mode S at 1090 MHz and on the UAT 978 link.1
Overview
The FAA was created in 1958 and is responsible for the safety and regulation of US civil aviation: it certifies aircraft and airmen, writes the Federal Aviation Regulations, and runs the air traffic control system that keeps the National Airspace System orderly. Over the past two decades its defining programme has been NextGen, a shift from ground radar to satellite-based surveillance, of which ADS-B (Automatic Dependent Surveillance – Broadcast) is the centrepiece. A rule effective January 2020 mandated ADS-B Out in most controlled US airspace.
The FAA specifies two physical links. Air carriers and most turbine aircraft use 1090 MHz Extended Squitter, riding on the Mode S transponder, while general aviation may instead use the UAT 978 (Universal Access Transceiver) data link at 978 MHz. Because UAT is a two-way link, the FAA’s ground infrastructure also broadcasts two free services to equipped aircraft: TIS-B (Traffic Information Service – Broadcast), which relays nearby traffic including non-ADS-B targets seen by radar, and FIS-B (Flight Information Service – Broadcast), which sends weather, NOTAMs, and other advisories. The FAA sets US operational requirements but does not write the detailed signal standards alone: it works with RTCA, whose DO-260 series defines the ADS-B message performance, while the global framework above the FAA is set by ICAO.
Relevance to SDR
The FAA’s mandates are why the airwaves over the United States are full of decodable aircraft
data. Because ADS-B, UAT, TIS-B, and FIS-B are open, unencrypted broadcasts designed for
interoperability, an inexpensive SDR and a dedicated decoder can receive them: 1090 MHz for
airliners with tools like dump1090, and 978 MHz to pull in the traffic and weather pictures
that TIS-B and FIS-B paint for general aviation. The FAA effectively turned a regulatory
requirement into one of the most popular SDR hobbies, and crowdsourced feeder networks now
depend on thousands of these receivers.
Aircraft surveillance sits outside GopherTrunk’s land-mobile trunking focus, so GopherTrunk does not itself decode these links; dedicated 978/1090 MHz tools handle them. The reference stands as context for the wider RF landscape an SDR user explores, and it explains why US aviation signals are so uniform and abundant: a single national authority mandated them.
Sources
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Federal Aviation Administration — Wikipedia, for the FAA’s history, structure, and role in US aviation. ↩