1.2 DAG-TM Activities under AATT
In order to develop this DAG-TM Concept Definition and a companion DAG-TM Research Plan (presented in Ref. 2), the AATT Project formed a DAG-TM Team, composed of personnel with expertise in the following disciplines:
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Aircraft systems and operations
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En route ATM systems and operations
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Terminal & surface ATM systems and operations
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Human factors
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Benefits and safety
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Advanced ATM communications.
From January through September of 1999, the DAG-TM Team conducted a series of five 3-day workshops and numerous weekly telecons to develop the DAG-TM concept and research plan, using a consensus-building process. Following AATT management and external reviews, DAG-TM research activities will be conducted at NASA Research Centers, contractor facilities and other organizations.
1.3 DAG-TM Vision Statement
The premise of the Distributed Air/Ground Traffic Management (DAG-TM) concept is that distributing real-time decision-making between users and Air Traffic Service Providers (ATSP) will maximize the users’ flexibility to optimize their operations while increasing ATSP productivity, thereby increasing the efficiency and capacity of the system as a whole. The fundamental characteristics of DAG-TM have been defined in the following vision statement developed by the DAG-TM Team.
“Distributed Air/Ground Traffic Management is a National Airspace System concept in which flight deck (FD) crews, air traffic service providers (ATSP) and aeronautical operational control (AOC) facilities use distributed decision-making to enable user preferences and increase system capacity, while meeting air traffic management requirements. DAG-TM will be accomplished with a human-centered operational paradigm enabled by procedural and technological innovations. These innovations include automation aids, information sharing and Communication, Navigation, and Surveillance (CNS) / Air Traffic Management (ATM) technologies.”
1.4 Scope of DAG-TM Concept
DAG-TM is a proposed concept for gate-to-gate NAS operations beyond the year 2015. It will address dynamic NAS constraints such as bad weather, Special Use Airspace (SUA) and arrival metering/spacing. The goal of DAG-TM is to enhance user flexibility/efficiency and increase system capacity, without adversely affecting system safety or restricting user accessibility to the NAS.
The DAG-TM concept is intended to address all user classes (commercial carriers, general aviation, etc.) with an emphasis towards ensuring access to airspace resources for the entire user community. It covers all flight phases (Pre-Flight Planning, Departure, Cruise and Arrival) and operational domains in the NAS (Surface, Terminal Airspace and En route Airspace). Although other operational domains (e.g., European, oceanic, and under-developed airspace) are outside the scope of the current DAG-TM concept, research activities will give due consideration to global interoperability issues.
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