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ENRI -Pub-2003-10
Study on International Air Traffic Flow Management
Yutaka Fukuda
Presented at: ENRI seminar
Abstract:
This paper describes design and evaluation of an assisting system for air traffic controllers in keeping a
separation between aircraft in the oceanic airspace.
In order to keep the separation in the oceanic airspace, air traffic controllers check a longitudinal separation
between leading aircraft and trailing aircraft on the same route and the same altitude before the aircraft enter into
the oceanic airspace.Departing aircraft from major international airports in Japan request their air traffic control
clearances for the route, speed and cruising altitude before departure. Air
traffic controllers check their requests
whether they would result in conflicts with other aircraft.If they find conflicts, they issue some modified plan to
the aircraft such as altitude change and departure time change to resolve conflicts.
An experimental model is developed to assist the present air traffic controllers' work
for merging oceanic flights.
It predicts time of arrival at the entry fix in the oceanic airspace.It searches conflicts based on a time- based
longitudinal separation defined with margin to absorb prediction errors.If it finds conflicts, it advises modified
departure time on requested altitude and alternative altitude to resolve conflicts based on resolution rules.Air
traffic controllers select one of the advisories to modify the plan.Modifying the plan is also executed with drag
and drop operation of graphical user interface.It is important to adjust the margin of separation and the resolution
rule to the operational environment.
Air traffic controllers participated in simulation experiments.They found it useful to detect conflicts and to
advise modified departure time on requested altitude and alternative altitude.
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