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HIGHLIGHTS ARCHIVE
06.08.11
Division Highlights

Contents
Development of new Scheduling Simulation Tool
A new dynamic fast-time scheduling simulation tool has been developed for the ADS-B Enabled Green Operations Using Integrated Scheduling and Spacing (AEGIS) project to enable investigation of scheduling concepts. Building conceptually on the Stochastic Terminal Area Scheduling Simulation (STASS) software used for prior human-in-the-loop simulations, this new tool provides two main improvements: generalized airspace topologies and dynamic scheduling. Generalized terminal airspace topologies allows scheduling to all intermediary merge points between the meter fixes and runways giving a more accurate representation of terminal airspace. The dynamic scheduling capability iteratively schedules and simulates through time to allow built-up delays to feed back through the system. With database storage of all simulation parameters and metrics, expansive trade space studies can be facilitated. (POC: Daniel Mulfinger)

Screenshot of ACES showing levels of air traffic density over the United States.
The Airspace Concept Evaluation System (ACES) is used to model the flow of traffic across the U.S. This snapshot shows all of the flights over the U.S. at a given time.

Researchers Get Tips on Modeling Airspace Concepts using ACES at Ames Workshop
The Systems Modeling and Optimization Branch hosted a 2-day workshop May 18-19, 2011 at Ames Research Center to share NASA's research experience using the Airspace Concept Evaluation System (ACES). Forty-nine researchers and software developers attended the workshop, representing the William J. Hughes (FAA) Technical Center, NASA Ames Research Center, NASA Langley Research Center, Aerospace Computing Inc., Intelligent Automation Inc., Mosaic ATM Inc., Raytheon, and the University Affiliated Research Center. Researchers from the FAA Technical Center used ACES in their benefit assessment studies and were interested in using ACES to study the effects of trajectory uncertainty. Researchers at Ames gave presentations on how to set up and use ACES to assess benefits and interactions of several ATM concepts, including separation assurance, interaction between traffic flow management and dynamic airspace configuration, and precision departure release capability. Researchers from NASA Langley Research Center explored using ACES as a system cost and benefit analysis tool in particular to study terminal area merging and spacing. Representatives from the Joint Planning and Development Office presented their work on system-wide portfolio assessment and Unmanned Aerial System integration in the National Airspace System. The latter focuses on communication bandwidth using the Communication Navigation and Surveillance component of ACES. (POC: Kee Palopo)

ACES Users Group Grows by Three
Three external organizations have recently requested ACES to support their research. The first organization, the U.S. Department of Transportation/Volpe National Transportation Systems Center/Traffic Flow Management Division (RVT-73), is evaluating a Dynamic Meter Point concept for consideration as a future functional enhancement to the FAA's Time Based Flow Management so that meter points can be placed at any location in the airspace, not necessarily tied to existing fixes. The second organization, the Human Performance Modeling group of the National Information and Communication Technology Australia (NICTA)'s Queensland Research Lab, is developing an air traffic management model in partnership with Air Services Australia. Their main goal is to analyze Australian air traffic management and find solutions that would reduce the workload of air traffic controllers. The third organization, Czech Technical University, is considering using ACES in their Unmanned Aerial Vehicle research. (POC: Kee Palopo)

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