The air transportation system of the United States is acknowledged to be under increasing stress. Without urgent action, it will continue to degrade, with increasingly costly aircraft flight delays and increasing concerns over flight safety. NextGen is a wide-ranging transformation of the entire National Airspace System (NAS) of the United States, not just pieces of it, to meet future demands and avoid gridlock. It moves away from legacy ground based technologies to new and more dynamic satellite-based technology. The new capabilities and the highly interdependent technologies aim to change the way that the system operates, reduce congestion, and improve passengers' experiences.
NextGen consists of five elements:
- Automatic dependent surveillance-broadcast (ADS-B). ADS-B will use the Global Positioning System (GPS) satellite signals to provide air traffic controllers and pilots with much more accurate information that will help to keep aircraft safely separated in the sky and on runways. Aircraft transponders receive GPS signals and use them to determine the aircraft precise position in the sky. This and other data is then broadcast to other aircraft and air traffic control. Once fully established, both pilots and air traffic controllers will, for the first time, see the same real-time display of air traffic, substantially improving safety. The FAA will mandate the avionics necessary for implementing ADS-B.
- System Wide Information Management (SWIM). SWIM will provide a single infrastructure and information management system to deliver high quality, timely data to many users and applications. By reducing the number and types of interfaces and systems, SWIM will reduce data redundancy and better facilitate multi-user information sharing. SWIM will also enable new modes of decision making as information is more easily accessed.
- Next Generation Data Communications. Current communications between aircrew and air traffic control, and between air traffic controllers, are largely realised through voice communications. Initially, the introduction of data communications will provide an additional means of two-way communication for air traffic control clearances, instructions, advisories, flight crew requests and reports. With the majority of aircraft data link equipped, the exchange of routine controller-pilot messages and clearances via data link will enable controllers to handle more traffic. This will improve air traffic controller productivity, enhancing capacity and safety.
- Next Generation Network Enabled Weather (NNEW). Seventy percent of NAS delays are attributed to weather every year. The goal of NNEW is to cut weather-related delays at least in half. Tens of thousands of global weather observations and sensor reports from ground-, airborne- and space-based sources will fuse into a single national weather information system, updated in real time. NNEW will provide a common weather picture across the national airspace system, and enable better air transportation decision making.
- NAS Voice Switch (NVS). There are currently seventeen different voice switching systems in the NAS, some in use for more than twenty years. NVS will replace these systems with a single air/ground and ground/ground voice communications system.
