Air Traffic Management Concept Baseline Definition - The Boeing ...

Figure 3.7 illustrates how intervention rate, intervention and detection combine in an
overall separation assurance function, and lists the performance factors involved in each
component. Nakamura and Schwab (1996) propose a framework where the performance
of each of these fundamental factors is combined in an overall Required System
Performance parameter, which is then directly related to a minimum allowable separation
between aircraft. The navigation function performance has been formalized through the
definition of Required Navigation Performance, as described in the RTCA Special
Committee 181 document DO-236 (RTCA, 1997). RNP includes a definition of accuracy,
integrity and availability levels, which are functions of navigation sensors and their
sources, cockpit-crew interface design and pilot performance. To compose an overall
performance index (RSP) for the separation assurance function, consideration must be
given to Required Communication Performance (RCP) and Required Monitoring
Performance (RMP), along with an additional potential metric relating to the performance
of the traffic planning function that manages intervention rate.
Resource-Constrained
Effective
Theoretical Effective Resource-Constrained
Intervention Rate
Intervention Detection
RNP, RMP, RCP RMP, RCP RMP
Display
Weather
Medium-Term Intent
Data Controller
Comm: g/g
Pilot
Flow Rates
Airspace Complexity
Sensor
Display
Short-Term Intent
Controller
Comm: a/g
Pilot
Closure Rate
Sensor
Display
Controller
Pilot
Required Element Performance
RxP = f (sensors, decision support, human)
Required System Performance sets the Separation Standard
RSP = g ( RCP, RMP, RNP )
Figure 3.7 Separation Standard and Performance Factors
The operational concept presented in this report is centered on needed increases in NAS
capacity to accommodate the predicted growth in traffic demand through 2015. The
system operational enhancements that make up the concept are centered around changes
in the performance of the separation assurance and navigation functions depicted in Figure
3.7, since these are the primary influences on system capacity. The phasing that is
suggested in Section 3.3, and described in Section 6.2, is one where the intervention rate
performance is worked first, then the intervention performance, and finally the core
detection function. The rationale for this phasing is twofold:
• There is capacity to be gained by reducing the spacing buffers inserted in today’s
operation above the minimum separation standard, to account for uncertainty in sector
traffic planning.
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