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FEDERAL AVIATION ADMINISTRATIONFEDERAL AVIATION ADMINISTRATION
FLIGHT OPERATIONS, SIMULATION, andFLIGHT OPERATIONS, SIMULATION, andANALYSIS BRANCH, AFS-440ANALYSIS BRANCH, AFS-440
Oklahoma City, OK, USAOklahoma City, OK, USA
November 12, 2003
Dr. David N. Lankford (FAA/AFS-440)Shahar Ladecky (ATSI)
Airspace Simulation and Analysis for TERPS(Terminal Procedures)
Dr. David N. Lankford
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What is ASAT?
A multifaceted computer tool foraviation related simulations and
safety evaluations
Partnerships with Industry &Government (1)
● NASA (AILS, AVOSS, SATS)● Boeing (Aircraft models)● Bell, Sikorsky (and Eurocopter) (Helicopter
models)● Smiths (FMS software)● Air Traffic Simulation, Inc (simulation
software & automation tools)
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Partnerships with Industry &Government (2)
● University of Central Oklahoma(Research programs)
● University of Oklahoma (GPS flighttests)
● Airlines (American, Continental,United, Delta, etc.)
● Airports (SFO, DFW/DAL, ORD, etc.)● FAA (AVN, AT, AND, ASY, ASC, etc.)
What has ASAT been used for?
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ASAT Projects
● MPAP (PRM)● St. Louis● San Francisco● Philadelphia● DFW/Dallas● Juneau● John F. Kennedy● Denver● Newark● Boston● Detroit
● SOIA● 250 Kts Departures● Ghosting (CRDA)● FMS/MA● AILS (NASA)● Wake Vortex● GPS/WAAS/LAAS● RNP/RNAV● OFZ/NLA● LAHSO● Cleveland● …Others (many…)
ASAT technical presentation.
Shahar Ladecky, ATSI
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ASAT consists of various high fidelitymodels representing each component ofgiven real life scenarios such as:
● Aircraft■Flight Dynamics■Propulsion/Performance
■Wake Turbulence (AVOSS)
■On board Avionics
How does ASAT do it? (1)
● Geographical/Geodetic■Digital Terrain Elevation Data (DTED)
■Obstacles
● Environmental■Standard Atmosphere
■Non-Standard Atmosphere
■Measured Wind and Temperature GradientsData
How does ASAT do it? (2)
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● Navigation Ground Systems
● Surveillance■PRM
■ASR-9
■ARSR
■TCAS■ADS-B
How does ASAT do it? (3)
● Human Factors■Pilot
■ATC
How does ASAT do it? (4)
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How does ASAT do it? (5)
③ Sample Statistical Variables(only a few are listed!):" Human:
• Pilot• Controller
" Operational
" Procedural" Aircraft Performance" Environment
" …
● The high-fidelity models use high fidelitydata representing a wide range ofoperational aspects.
How does ASAT do it? (6)
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How does ASAT do it? (7)
Models interact with each other like in reallife...
Environment
ATCOn-BoardSystems
Pilot
SurveillanceEnvironment
Geog/Geod
Aircraft
GroundNavigationSystems
Geog/Geod
Tile # i @ T+∆T
Tile # i+1 @ T+∆T
AircraftTrajectory
Wake @ T+½∆T
Wake @ T
Wake @ T+∆T
WIND
AVOSS Implementation
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Typical AVOSS Temperature Data
0
500
1000
1500
2000
22 23 24 25 26 27
Am bient Tem perature [C ]
Alti
tud
e [F
T]
T yp ic a l A V O S S C ro ss W in d M o d e l
0
5 00
1 00 0
1 50 0
2 00 0
0 2 4 6 8 1 0 1 2 1 4
C ro ss-W in d In ten sity [K TS ]
Alt
itu
de
[FT
]
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…and to summarize…
How does ASAT do it? (7)
ASAT will give us an educated answer about:
What happensWhere does it happen
How Much happensHow Often it happens and
When does it happen
ASAT: The Bottom Line...
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INPUTS:
• Aircraft (and/or)
• Flight Simulators
• Pilots
• ATC
• Environment
• Obstacles
• Terrain
• Nav-aids
• Avionics
•Others . . .
ASAT ANSWER
or in a simple way...
Metrics (Whatto Measure?)
OperationalScenario
ASAT: Versatile Implementation
ASAT can provide answers in two waysnamely;
� Deterministic: does a particular event ofinterest occur?
� Statistical: what is the probability of anevent to occur or
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INPUTS:
• Aircraft (and/or)
• Flight Simulators
• Pilots
• ATC
• Environment
• Obstacles
• Terrain
• Nav-aids
• Avionics
•etc, etc, etc...
ASATLevel of Safety
10-?
Risk of Mid-Air Collision (NMAC)
Closest Point ofApproach (CPA)
BlunderScenario
INPUTS:
• Aircraft (and/or)
• Flight Simulators
• Pilots
• ATC
• Environment
• Obstacles
• Terrain
• Nav-aids
• Avionics
•etc, etc, etc...
ASAT
Risk of Wake Vortex Encounter
Did EncounterOccur?
Wake VortexScenario
Distance BetweenWake and TrailingA/C
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ASAT: A380 Study Case (1)
ASAT can determine wake vortexencounter geometry and wake vortexstrength (Γ).
ASAT’s output has been costomizedto facilitate easy data transfer toAirbus’ VESA analysis tool.
ASAT
ASAT: A380 Study Case (2)
Wake data andtrailing Aircraftrelative geometryWake Vortex
Scenario
Distance BetweenWake and TrailingA/C
VESA
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ASATAVIA
Demonstration
(ASAT-AVOSS-SOIA Tool)