The basics
ADS-B is the first core technology within NextGen, the ongoing program to increase the efficiency, capacity and safety of the world?s airspace systems.
ADS-B is an Air Traffic Management (ATM) Surveillance system that will replace traditional radar-based systems. It provides greater accuracy and wider coverage to safely allow reduced separation, more efficient routing and other benefits.
ADS-B is like a large wireless network - the ground stations are Wireless Access Points and the aircraft are Clients.
Aircraft report their own position via the network and receive weather, traffic and other information from the ground network and other aircraft.
Computers on the ground integrate all the information for comprehensive views of the airspace for pilots and controllers.
Aircraft only need an approved WAAS GPS as the high-integrity ADS-B position source and an ADS-B Out datalink radio. Aircraft owners can choose to keep or replace their current transponder. ADS-B In receivers are optional but enable valuable weather and traffic data services.

ADS-B is part of NextGen
NextGen is the name for a multi-faceted program to increase the efficiency, capacity and safety of the world?s Air Traffic Management (ATM) systems. ADS-B, or Automatic Surveillance Surveillance-Broadcast, is the first core technology program within NextGen. It is one of several ATM Surveillance technologies that shift air traffic control from expensive 70-year-old radar technology to a sophisticated network of airborne-, ground- and satellite-based systems.*
ATM encompasses three main areas: Communications, Navigation and Surveillance. ADS-B is significantly more accurate than surveillance radar because aircraft positions are updated once - per-second vs. between 4 and 12 seconds for radar. Radar also is subject to range limitations and shadowing caused by natural and manmade obstructions. The 800 relatively low-cost ADS-B ground stations in the U.S. provide comprehensive national coverage.

Proven in Real-World Flying
ADS-B has been rigorously tested for over a decade in both ordinary and extraordinarily challenging real-world conditions. ADS-B makes flying more efficient, more economical, environmentally friendlier and safer.

FreeFlight Systems RANGR-G ADS-B systems are designed for high value ground vehicles to provide position reporting that is accurate down to meters in real time. The RANGR-G provides critical information that Air Traffic controllers require to increase safety in active movement areas. The 978 MHz datalink and integrated SBAS GPS differentiates the RANGR from the current low cost, intermittent reception, low integrity GPS tracking systems.

The RANGR-G's support and maintenance can be managed via the USB port and an easy to use PC application that can be hosted on a laptop. Utilizing an internally stored map of the airport control area, the system can be configured to transmit vehicle information when located in specified areas and to cease when in other specified areas.

FreeFlight's aviation-certified internal WAAS/GPS sensor provides the ability to collect position, velocity, and other vehicle state information. The FDL-978-GTX/E transmits the data from the airport ground vehicle to air traffic and ground control once per second, allowing positive identification of the vehicle. The system utilizes robust Universal Access Transceiver technology and is fully compatible with ASDE-X and multilateration systems, ensuring seamless integration with existing traffic control support systems.