Page 10 - InterPilot Vol2 No2
P. 10


New Air Traffic


Photo courtesy of Boeing Images

Air traffic service providers and regulators are moving toward airspace and flight
operations to enable greater flexibility and adaptability, and assure improved
traffic flow, capacity, efficiency, and safety. A key part is the transition from

radar surveillance to Automatic Dependent Surveillance-Broadcast (ADS-B) to track
ADS-B is intended
to transform air traffc
airplanes in flight and on the ground more accurately and reliably. William R. Richards,
control by providing more
Kathleen O’Brien, and Dean C. Miller explore what these changes mean for Boeing aircraft.
accurate and reliable
tracking of airplanes in
fight and on the ground.
DS-B is a new surveillance technology For NextGen and SESAR, ADS-B is one of with very specific information about the
Adesigned to help modernize the air the most important underlying technologies location and speed of airplanes in the area
transportation system. It provides founda- in the plan to transform ATC from the cur- (see Figure 1).
tional technology for improvements related rent radar-based surveillance to satellite- From the airplane perspective, there are
to the next generation Air Transportation based global positioning system (GPS) sur- two aspects to ADS-B. ADS-B Out signals are
System (or NextGen) and Single European veillance. In addition, the FAA states that sent from the transmitting airplanes to
Sky Air Traffic Management (ATM) Research ADS-B will serve as the cornerstone for this receivers located on the ground or in other
Programme (or SESAR). NextGen refers to transformation, bringing the precision and airplanes. The ADS-B Out signals travel line-
the effort of the U.S. Federal Aviation reliability of satellite-based surveillance to of-sight from transmitter to receiver. ADS-B
Administration (FAA) to transform the air the nation’s skies. Out signals are received by ATC ground sta-
traffic control (ATC) system to support a This article explains the new ADS-B tech- tions for display of traffic to air traffic con-
larger volume of airplanes more efficiently. nology, how it works in the airplane, how it trollers. ADS-B Out signals are also received
SESAR is a similar effort in Europe. is used in ATC, and how this technology by other airplanes in the vicinity of the
Developed and certified as a viable low- benefits ATC surveillance on the ground. It transmitting airplanes. After reception of
cost replacement for conventional radar, will also explain how ADS-B will increase the ADS-B signals by the receiving airplane,
ADS-B allows ATC to monitor and control flight crew awareness of other airplanes in the lateral position (latitude and longitude),
airplanes with greater precision and over a the air and on the ground, highlight poten- altitude, velocity, and flight number of the
far larger percentage of the earth’s surface tial operator benefits, and outline the transmitting airplane are presented to the
than has ever been possible before. For upcoming equipage mandates. receiving airplane pilot on a Cockpit Display
example, large expanses of Australia and of Traffic Information (CDTI). The received
Hudson Bay in Canada, currently without HOW ADS-B WORKS ADS-B signal is called ADS-B In. The maxi-
any radar coverage, are now visible on ATC ADS-B uses a combination of satellites, mum range between the transmitting and
screens after strategic placement of low- transmitters, and receivers to provide both receiving airplanes is greater than 100 nau-
cost ADS-B receiving stations. flight crews and ground control personnel tical miles (nmi), allowing the CDTI to dis-
Vol 2 | No 2 | July 2014 InterPilot | The Safety and Technical Journal of IFALPA
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