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HIGHLIGHTS ARCHIVE
06.12.07 Division Highlights

Contents
Prototype FACET/ACES Integration Demonstrated: Researchers from Optimal Synthesis Incorporated visited the Aerospace Operations Research (AFM) branch on Thursday, June 7, to demonstrate their software, which integrates the Future ATM Concepts Evaluation Tool (FACET) and the Airspace Concept Evaluation System (ACES). When combined together, the two tools form a system that can be used to model and simulate future concepts for managing traffic in the national airspace system. In this system, FACET serves as the tool used to devise strategies for regulating traffic flows, and ACES serves as the simulation of the national airspace system. The innovative feature is that environmental information and mathematical models used in the strategy formulation process are separate from those used in the national airspace system simulation process. Keeping the information and models distinct allows researchers to model uncertainties in the strategy formulation process and see the effects of those uncertainties in the results of the simulation process.

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Integration of Trajectory Automation and FMS/Datalink Extended: The real-time integration of the trajectory-based automation in the Center/TRACON Automation System (CTAS) and the full-fidelity integrated FMS/datalink capabilities in the Crew Vehicle Systems Research Facility (CVSRF) 747-400 simulator has been extended to enable piloted simulations where nearly all aircraft in a traffic scenario are equipped for FMS/datalink trajectory exchange. Using the new functionality, the 747-400 simulator is dynamically initialized to the flight conditions of any aircraft in a traffic scenario. By reinitializing the simulator at numerous conditions over the course of a simulation, the ground-based trajectory automation system may datalink a wide variety of trajectory changes to a large number of equipped aircraft while a single 747 flight crew is exposed to the same variety trajectory changes via full-fidelity integrated FMS/datalink. An experiment is being planned to study the interaction between trajectory-based automation for separation assurance and the integrated FMS/datalink capabilities in the cockpit.

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Departure Scheduling Algorithm: Scheduling of aircraft at a departure queue has been formulated as an assignment problem with precedence and timing constraints. We have developed a simple algorithm for this problem based on linear programming techniques. Though the problem is NP-complete, the developed algorithm produces solutions whose costs are on an average 10% away from the optimal cost. We have also developed a node-link model of the entire DFW airport. In the future, the developed algorithms will be implemented with the surface traffic data for the DFW airport.

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Pilot Models in Severe Weather: An analysis of Atlanta ARTCC (ZTL) flights was conducted to correlate flight tracks obtained in CTAS with CIWS (Corridor Integrated Weather System) weather data (echo-tops/cloud height and precipitation value) and evaluate aircraft trajectories in the presence of convective weather. Initial results corroborate knowledge about pilot behavior in practice and previous studies on pilot behavior with data taken from other Centers. This initial finding will be used to continue collaborative investigations with MIT - Lincoln Laboratory of pilot behavior in convective weather.

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Completed CTAS software to send ATC advisories to simulators: Software has been completed that sends aircraft information and advisories from the Center-TRACON Automation System (CTAS) to simulators that adhere to the industry recognized Controller-Pilot Datalink Communication (CPDLC) data protocol. There were significant technical challenges to overcome in sending the data using the CPDLC format. Recently, this software was used in the demonstration to Dr. Porter to describe a joint experiment between the Airspace Systems Program (ASP) and the Aviation Safety Program (AvSP) using the Boeing B747-400 simulator.

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Augmented Reality Tower Tool and ATM System Data Infrastructure: In preparation for the upcoming Augmented Reality Tower Tool (ARTT) studies in support of the ASDO technical element, a new method has been developed for securely distributing aircraft state information from real-time ADS-B data. The current ARTT prototype can securely access this data via cellular wireless connection. This method may also be used in the future to securely serve systems at remote locations with the Aviation Systems Division's other real-time ATC system data (e.g., all 20 ARTCCs, or the eight TRACONs currently in the Aviation System Division inventory).

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Last Updated: November 7, 2018

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