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Paper 17 -- Airborne Conflict Management Within Confined Airspace In A Piloted Simulation Of Dag-Tm Autonomous Aircraft Operations

A human-in-the-loop experiment was performed at the NASA Langley Research Center to study the feasibility of Distributed Air/Ground Traffic Management (DAG-TM) autonomous aircraft operations in highly constrained air-space. The airspace was constrained by a pair of special use airspace (SUA) regions on either side of the pilots planned route. The available airspace was further varied by changing the separation standard for lateral separation between 3 nm and 5 nm. The pilot had to maneuver through the corridor between the SUAs, avoid other traf-fic and meet flow management constraints. Traffic flow management (TFM) constraints were imposed as a re-quired time of arrival and crossing altitude at an en route fix. This is a follow-up study to work presented at the 4th USA/Europe Air Traffic Management RSeminar in December 2001[1].Nearly all of the pilots were able to meet their TFM constraints while maintaining adequate separation from other traffic. In only 3 out of 59 runs were the pilots un-able to meet their required time of arrival. Two loss of separation cases are studied and it is found that the pilots need conflict prevention information presented in a clearer manner. No degradation of performance or safety was seen between the wide and narrow corridors. Although this was not a thorough study of the consequences of re-ducing the en route lateral separation, nothing was found that would refute the feasibility of reducing the separation requirement from 5 nm to 3 nm. The creation of addi-tional, second-generation conflicts was also investigated. Two resolution methods were offered to the pilots: strate-gic and tactical. The strategic method was a closed-loop alteration to the Flight Management System (FMS) active route that considered other traffic as well as TFM con-straints. The tactical resolutions were short-term resolu-tions that left avoiding other traffic conflicts and meeting the TFM constraints to the pilot. Those that made use of the strategic tools avoided additional conflicts, whereas, those making tactical maneuvers often caused additional conflicts. Many of these second-generation conflicts could be avoided by improved conflict prevention tools that clearly present to the pilot which maneuver choices will result in a conflict-free path.These results, together with previously reported stud-ies, continue to support the feasibility of autonomous air-craft operations.
Theme: Air Ground Cooperation
Posted by: Bryan Barmore / Other authors: Edward Johnson, David Wing, Richard Barhydt
Note: Unset Received On Dec 20, 2005

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