CSSI, Inc. Headquarters 400 Virginia Avenue, SW

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Advances in NASPAC Innovations in NAS-wide
Simulation Workshop George Mason
University January 27th - 28th 2010 Lakshmi
Vempati
CSSI, Inc. Headquarters400 Virginia Avenue, SW
Suite 210 Washington, DC 20024 202.863.2175
202.863.7400 fax [phone] toll-free
www.cssiinc.com
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Outline

• Introduction
• NASPAC Current Architecture
• Recent Enhancements
• Oceanic Operations
• Terminal Area Modeling
• Closing comments

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Introduction

• National Airspace System Performance Analysis
  Capability (NASPAC)
• System-wide model developed in the 1980s
• Discrete event simulation representing the NAS as
  a network of interconnected queues
• Used for cost-benefit analysis
• Technical and software support provided by CSSI
  and Metron for the FAA (Joe Post)

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NASPAC Current Architecture
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Oceanic Operations

• Model separation of aircraft in US oceanic
  airspace through the use of restrictions
• Oceanic regions modeled (with updated find
  crossings module)
• Oakland oceanic (ZOA),
• New York oceanic (ZNY) and
• Anchorage oceanic (ZAN) sectors 10 and 11.
• Challenges
• No geometry information in the simulation engine
• Limitation of existing find crossings module to
  NW quadrant of the globe only
• Pre processing and data requirements
• Process and merge ATOP FPL with FZ where
  necessary and cleanse data
• Compile international waypoint data into NASPAC
  readable format
• Sector definitions for New York, Oakland and
  Anchorage
• Oceanic separation standards lookup based on
• Equipage
• Oceanic Region

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Gate Finder

• Gate Finder to generate restrictions
• Un-capacitated US oceanic sectors for Oakland
  (ZOA), New York (ZNY), and Anchorage (ZAN) fully
  functional with newer sector crossings module
• Restriction generated at any "filed waypoint
  filed cruise altitude" in the schedule used by 2
  or more flights

Input schedule
Sector definitions
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Oceanic Operations Example restrictions

• Restrictions created for one NASPAC schedule
• Vertically-oriented lines represent restrictions
  created on oceanic network waypoints
• Horizontally-oriented lines represent
  restrictions on all other waypoints

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Terminal Area Modeling

• Incorporate SID/STAR/IAP routes into flight
  schedules and integrate into trajectory modeler
  to support modeling altitude restrictions
  (level-offs)
• Challenges
• SID/STAR/IAP definitions are updated every 56
  days.
• Not all procedure definitions are included in the
  National Flight Database. Example SIDs with
  non-structured routing
• SID/STAR/IAP charts contain extensive information
  in free text as well as graphically. Not all
  information is captured in the database.
• Special cases
• Altitude restrictions based on direction of
  arrival e.g. KORD Janesville 5 Arrival
• Procedures applicable to Aircraft type (e.g.
  Turboprop, Turbojet), Equipage (e.g. DME, GPS),
  Speed restrictions (e.g. 250K, 280K), Time of
  day, Runway use (e.g. R12L fly at 10000)
• Expect to cross at lowest available altitude
  (e.g. KEWR Williamsport 5Arrival)
• Combination of multiple aircraft type, multiple
  runway altitude restrictions (e.g. KBOS Gardner 3
  Arrival)
• Existing schedule filed waypoint inconsistencies
• Field 10 parsing issues
• Issues with merging existing routes with
  SID/STAR/IAP

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SID/STAR Implementation

• Pre-processing and data requirements
• Field 10 (Route of flight information)
• SID/STAR/IAP definitions
• Supplemental information from aeronautical charts
• Parse field10, lookup SID/STAR when specified and
  merge into waypoints list
• Assignment and Merging Algorithm

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SID/STAR Assignment Examples
ATL Departures
IAD Arrivals
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Closing comments

• Initial oceanic restrictions and in trail
  separations (distance and time-based) implemented
• Initial SID/STAR routing, assignment and merging
• Ongoing efforts
• Oceanic in-trail climb/descent
• IAP assignment
• Full integration into NASPAC

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Questions?
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Backup Slides
CSSI, Inc. Headquarters400 Virginia Avenue, SW
Suite 210 Washington, DC 20024 202.863.2175
202.863.7400 fax [phone] toll-free
www.cssiinc.com
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Oceanic Separation Standards