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Controller—pilot data link communications CPDLC , also referred to as controller pilot data link CPDL , is a method by which air traffic controllers can communicate with pilots over a datalink system. The standard method of communication between an air traffic controller and a pilot is voice radio, using either VHF bands for line-of-sight communication or HF bands for long-distance communication such as that provided by Shanwick Oceanic Control.

One of the major problems with voice radio communications used in this manner is that all pilots being handled by a particular controller are tuned to the same frequency. This increases the chances that one pilot will accidentally override another, thus requiring the transmission to be repeated. In addition, each exchange between a controller and pilot requires a certain amount of time to complete; eventually, as the number of flights being controlled reaches a saturation point, the controller will not be able to handle any further aircraft.

Traditionally, this problem has been countered by dividing a saturated air traffic control sector into two smaller sectors, each with its own controller and each using a different voice communications channel. However, this strategy suffers from two problems:. A new strategy is needed to cope with increased demands on air traffic control, and data link based communications offers a possible strategy by increasing the effective capacity of the communications channel.

At the highest level, the concept is simple, with the emphasis on the continued involvement of the human at either end and the flexibility of use.

The controller is provided with the capability to issue level assignments, crossing constraints, lateral deviations, route changes and clearances, speed assignments, radio frequency assignments, and various requests for information.

The pilot is, in addition, provided with the capability to request conditional clearances downstream and information from a downstream air traffic service unit ATSU. An auxiliary capability is provided to allow a ground system to use data link to forward a CPDLC message to another ground system. There can be several sequences of messages in the dialogue, each of which is closed by means of appropriate messages, usually of acknowledgement or acceptance.

Closure of the dialogue does not necessarily terminate the link, since there can be several dialogues between controller and pilot while an aircraft transits the ATSU airspace. Hughes Technical Center have shown that the use of CPDLC meant that "the voice channel occupancy was decreased by 75 percent during realistic operations in busy en route airspace. The net result of this decrease in voice channel occupancy is increased flight safety and efficiency through more effective communications.

CPDLC will probably be a major enabler for following on projects as monitor message, route clearance uplink, D trajectories, continuous descent approaches, and constraint coordination also. All CPDLC deployments must be supported by an approved safety case demonstrating that all safety objectives for the applicable airspace have been met. It then derives the safety objectives for such systems and the safety requirements with which they must comply.

Equally important is the need for accurate timestamping and the rejection of out-of-date messages. For aircraft, this is typically provided by GPS. From Wikipedia, the free encyclopedia.

Air traffic controlling method. Archived from the original on Retrieved Deutsche Flugsicherung GmbH. Coaxial cable Fiber-optic communication optical fiber Free-space optical communication Molecular communication Radio waves wireless Transmission line data transmission circuit telecommunication circuit. Space-division Frequency-division Time-division Polarization-division Orbital angular-momentum Code-division. Communication protocols Computer network Data transmission Store and forward Telecommunications equipment.

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EUROCAE Open Consultation ED-120 Ch. 3

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