3.3.1 AIRSPACE MODELLING ADVANTAGES ........................................................................................D-3-3

3.3.2 AIRSPACE MODELLING DISADVANTAGES ..................................................................................D-3-3

3.4 SETTING SIMULATION OBJECTIVES ........................................................................... D-3-3

3.5 PREPARATION................................................................................................................ D-3-4

3.5.1 PREPARING SCENARIOS...............................................................................................................D-3-4

3.6 DATA ANALYSIS............................................................................................................. D-3-4

3.7 SUMMARY OVERVIEW................................................................................................... D-3-5

ATTACHMENTS
D.3-1: Sample Scenario Identification Sheet: Airspace Modelling
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This chapter discusses Airspace Modelling as a Validation method. As with all other validation methods, it is seldom used in isolation to validate a Terminal Airspace design, but tends to be one of several validation methods used to validate a design.
The extensive development of simulation tools has meant that it is quite unusual to find a 'stand-alone' airspace modeller i.e. one whose functionalities are 'limited' to those described below. Most often, airspace modeller functionality is likely to be included amongst those of a fast-time simulator. This means that calculation of basic sector loads and the visualisation of these are part of the FTS package. Nevertheless, it is useful to provide a general overview of Airspace Modellers, and for designers to be aware that the material in this chapter should be considered complementary to that contained in the chapter discussing Fast-Time Simulation (see Chapter 4).
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Airspace modelling tools can be considered as "scaled down" version of Fast Time Simulators. Their main usage is to create a crude representation of the routes and airspace structures (sectors) together and their interaction with a selected traffic sample. The tool generate simplified 4D trajectories (position + time) for the aircraft according with the flights plans described in the Traffic Sample (with its Rules) in a particular Airspace Organisation (with its Rules). This process is called traffic assignment. These trajectories are used together with the airspace blocks to calculate a series of statistical data as: sector loading, route segment loading, conflicts, etc. Some more advanced airspace modelling tools can derive more refined data with regard to the workload and sector capacity.

Figure 3 - 1: Simplified Airspace Organisation on an Airspace Modeller
Usually the airspace modelling tool consists of a series of software modules which are used according to the designer need:
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graphical tools - used to define the Airspace Organisation for visualisation in 2D or 3D;

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trajectory manipulation tools -used to process the traffic sample (route assignment, time distribution, 4D trajectory generation, etc);

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data analysing & processing tools (traffic distribution queries, sector loading, conflicts evaluation, etc);
　
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