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currently in the sector and those that
are predicted to enter it in the next 20
minutes.
For each, it shows information such as
the predicted alert status, call sign,
flight plan altitude, aircraft type, route
information, etc.
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© 2000 The MITRE Corporation
Overview of URET
Capabilities: Continuous Conflict Prediction
Typical Sequence (chart 1 of 3)...
URET continuously checks
current plans, based on flight
plan and track data, for conflicts.
Here, a Red conflict is predicted
to occur in ZME Sector 62
between MTE741 and AAL568.
Currently, MTE741 is controlled
by ZID Sector 81; AAL568 is
controlled by ZME Sector 26.
URET determines the sector to
be notified of the conflict based
on the initial point-of-violation.
Thus, ZME Sector 62 is notified
here.
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© 2000 The MITRE Corporation
Overview of URET
Capabilities: Trial Planning
Typical Sequence (chart 2 of 3)...
The ZME Sector 62 controller
builds a trial plan to descend
MTE741 from its current
altitude of FL330 to FL290.
URET codes this trial plan
green on the GPD, indicating
that no conflicts are
predicted for this plan for the
next 20 minutes.
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© 2000 The MITRE Corporation
Overview of URET
Capabilities: Auto-Coordination
Typical Sequence (chart 3 of 3)...
Since ZID Sector 81 currently controls MTR741, ZME Sector 62 sends the trial plan for the
descent to FL290 as an auto-coordination request to that sector.
URET uses another display, the Plans Display, for sectors to exchange auto-coordination
information. (The Plans Display can also be used to look at the details for trial plan conflicts.)
Here, the auto-coordination request for MTE741 is shown. The CLEARED text indicates that
ZID Sector 81 has cleared the aircraft on that trial plan. URET will automatically update the
Host with this information when the 2-way Host connection is operating and the amended
flight plan is accepted.
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© 2000 The MITRE Corporation
Overview of URET
Capabilities: Trajectory Modeling
URET’s trajectory model adapts itself to the observed behavior of the aircraft. A before and after shot
of a climb profile is shown below. The red markers are altitude reports; the blue line is the trajectory.
After a vertical reconformance, the trajectory more closely matches the actual profile flown by the
aircraft. This allows for operationally acceptable prediction accuracy in a highly variable environment.
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© 2000 The MITRE Corporation
Overview of URET
Context for these Capabilities
0
Sec
30
Sec
2
Min
5
Min
20
Min
Conflict Alert/
MSAW
Conflict Alert/
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FAA’s Free Flight Modernization Initiatives(10)
