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a modeling and analysis capability to examine airspace concepts associated with future
advances to the United States’ National Airspace System (NAS). The system is also being
developed to provide a NAS perspective to the research and investment allocation
process. In providing this perspective, NARIM will include the modeling and analysis of
current and potential operations, the engineering impacts of future systems, and the ability
to trade requirements across system and procedural investment alternatives.
NARIM consists of a collection of operational models, architecture/infrastructure models,
NAS infrastructure data, demand data, and analysis tools. These functional elements are
used in a coordinated manner to perform a wide variety of analyses, including but not
limited, to investment alternative analysis, operational analysis, system-wide performance
assessment, concept exploration, and benefit/cost analysis of proposed NAS architecture
SEPARATION SAFETY MODELING
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enhancements. These tools provide a means of assessing how the system will perform
under new concepts of operation.
The NARIM system consists of three interrelated components:
· Operational modeling
· Architectural/Technical modeling
· Investment analysis modeling
The first two of these components will provide invaluable information to the
separation/collision Risk modeling effort.
The top level design of NARIM can be decomposed into the seven major components
illustrated in Figure 6-5: environmental data, demand data, preprocessors, operational
models, architecture/infrastructure models, investment analysis models, and analysis tools.
Environmental data includes data pertaining to the NAS infrastructure (such as sector
boundaries and subsystem performance characteristics), aircraft performance data (such as
climb rates and fuel flow), and weather data. Demand data is used within the NARIM
architecture to model the resultant load placed on the system for the input scenario.
Preprocessors are used to convert raw demand data into a common file format that can be
used by other models and analysis tools. Operational and architecture/infrastructure
models are used to compute specific performance metrics and typically have a set of
required inputs files, optional input files, and output files. Investment analysis models are
used to compare various investment alternatives and the interaction between the
associated system performance parameters. The analysis tools are usually more limited in
scope and provide a detailed computation or visualization of a specific performance metric
such as a proximity event.
The Models and Tools
Find Crossings (FC) is a tool used to identify the times and locations that aircraft enter
and leave sectors as well as other data elements such as instantaneous sector load and
average sector load. The first step in performing these computations is to generate the
structured sector database which is performed by the FC Setup preprocessor. This step
decomposes the three-dimensional airspace sectors into two-dimensional convex
polygons, mapped back to the original sector, and structured to expedite the performance
of FC Run. The structured sector database is then used in conjunction with a set of
demand data (i.e., 4-D trajectories) to compute the times and locations of sector entries as
well as sector utilization information. FC Run uses a highly optimized quad-tree algorithm
to perform these computations. The output of FC Run includes crossings, entry points,
sector statistics, and SUA activity data which are all used by other tools under the
NARIM analysis framework.
EXISTING MODELS AND MODELING TOOLS
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OAG
Environmental Data Operational Models Analysis Tools
NAS Infrastructure
Preprocessors
Aircraft Performance
Weather
Demand Data
ETMS (V4.2)
CDR
SAR Convert
FC Setup
Architecture/
Infrastructure
Models
RT Parser
NASSIM
RAMS
Total Traffic Tool
OPGEN
Find Crossings
Count Proximities
Display Load
Load Compare
Point Proximity
Dot Display
Leg Comparison
Insight5D
Investment
Analysis Models
Figure 6-5. NARIM Functional Elements
The Total Traffic Tool (T3) is typically used in conjunction with other NARIM analysis
tools to generate aircraft proximity events. Proximity events are used in NARIM analyses
as an indicator of the relative complexity or controller taskloading associated with a
demand scenario. T3 requires as input a set of 4-D trajectories and, optionally, the
structured sector database. T3 output (such as identification of the first proximity event
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a concept paper for separation safety modeling(42)
