ABBREVIATIONS
AATT Advanced Air Transportation Technologies ADL/DSSS Aeronautical Data Link/Decision Support System Services ADS-B Automatic Dependent Surveillance – Broadcast AOC Aeronautical Operational Control ARTCC Air Route Traffic Control Center ATC Air Traffic Control ATM Air Traffic Management ATSP Air Traffic Service Provider CD&R Conflict Detection and Resolution CDTI Cockpit Display of Traffic Information CE Concept Element (of DAG-TM) CNS Communications, Navigation and Surveillance CPDLC Controller/Pilot Data Link Communications CTA Controlled Time of Arrival DAG-TM Distributed Air/Ground Traffic Management DST Decision Support Tool ETA Estimated Time of Arrival FAA Federal Aviation Administration FCFS First Come First Served FD Flight Deck GPS Global Positioning System HUD Head-Up Display IFR Instrument Flight Rules IGS Intelligent Ground System IMC Instrument Meteorological Conditions NAS National Airspace System NASA National Aeronautics and Space Administration R&D Research and Development RTA Required Time of Arrival SUA Special Use Airspace TFM Traffic Flow Management TMU Traffic Management Unit TRACON Terminal Radar Approach Control VFR Visual Flight Rules VMC Visual Meteorological Conditions
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1. INTRODUCTION TO DAG-TM
The Distributed Air/Ground Traffic Management (DAG-TM) concept is a coherent set of conceptual elements that describe possible modes of operation within the outlines of the Free Flight concept defined by the RTCA Task Force 3 in Ref. 1. It may be viewed as one possible approach to the potential implementation of Free Flight, progressing along the path started by the Free Flight Phase 1 activities. This DAG-TM concept was developed by the Advanced Air Transportation Technologies (AATT) Project.
1.1 Advanced Air Transportation Technologies Project
The National Aeronautics and Space Administration (NASA) Office of Aerospace Technologies has identified a technology objective stating:
“While maintaining safety, triple the aviation system throughput, in all weather conditions, within 10 years.”
To respond to this technology objective, NASA has created the Aviation System Capacity Program which has developed a roadmap describing how NASA will meet this objective (see http://www.aero-space.nasa.gov/goals/fg/index4/goal4.htm for details).
One step on this roadmap is the Advanced Air Transportation Technologies (AATT) Project. By the year 2004, AATT will have contributed to this technology objective by developing technologies that will increase flexibility, predictability and efficiency, thereby leading to increases in system capacity. AATT’s objective is to improve the overall performance of the National Airspace System (NAS) as a whole. A stronger, more efficient, and less expensive aviation-transportation system will benefit the nation in two ways. First, the flying public and private sector will directly benefit from reduced transportation costs and increased schedule/connectivity. Second, the general public will indirectly benefit from the resulting economic growth (national productivity and gross national product) enabled by a more productive and efficient transportation system. The mechanism for improving the NAS as a whole is to improve the operations of both the system users (e.g., airlines, general aviation) and the Air Traffic Service Providers (ATSP).
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