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EUROCONTROL > Research & Development > PHARE > PHARE Demonstrations > PHARE Demonstration 1++ 

PHARE Demonstration 1++
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The National Air Traffic Services Ltd. (NATS) PHARE Demonstration 1++ project was a continuation of the previously conducted PHARE Demonstration 1 and PHARE Demonstration 1+ trials, and was designed to explore the use of the PHARE tools and operational concept within alternative en-route airspace structures and controller practices.
  Further details of PHARE Demonstration 1
  Further details of PHARE Demonstration 1+
The following concepts were explored, initially through the use of fast-time simulations and subsequently by means of a real-time simulation conducted on the NATS Research Facility:
  • the introduction of aircraft flying direct routes within an airspace containing aircraft flying on traditional, structured routes;
  • the use of larger sectors compared to those typically used in current day airspace designs;
  • the introduction of alternative controller operating practices.
 PHARE Demonstration 1++ facility
  PHARE Demonstration 1++ facility (Click for larger image)
The baseline scenario against which these concepts were compared included the introduction of Reduced Vertical Separation Minima (RVSM) and the availability of the PHARE Advanced Tools (PATs) to the controllers.

The PHARE Demonstration 1++ real-time trial took place in late August 1998. The airspace simulated was based on the two UK New En-Route Centre sectors 10 and 11, each sector being staffed by one planning controller and one tactical controller. Eight controllers participated in the trial.

The major conclusions from PHARE Demonstration 1++ were that, within the very specific scenarios investigated:
  • the PHARE Demonstration 1++ operational concept enabled the controllers to handle the increased traffic that resulted from the introduction of larger sectors and direct routes;
  • the increase in traffic resulted in an increase in controller workload that was within the controllers’ acceptable working limits.
PHARE Demonstration 1++ organisations 
PHARE Demonstration 1++ organisations (Click for larger image)  
However, it cannot be stated which elements of the operational concept under investigation – i.e. Reduced Vertical Separation Minima, PHARE Advanced Tools, direct routes or larger sectors – led to the controller’s ability to successfully manage the traffic.

Within the limits described above, it may be stated that the PHARE Demonstration 1++ trial successfully achieved that part of the PHARE objective designed to “demonstrate the feasibility and merits of an air-ground system” for the en-route phase of flight.

The main recommendations from the PHARE Demonstration 1++ trial were that further work should be carried out in the following areas:
  • understand the effect on controller workload and sector capacity of the introduction of either direct routes or larger sectors;
  • understand the relationship between controller workload and both sector capacity and total airspace capacity (i.e. groups of sectors) before conclusions can be drawn from the PHARE programme with respect to either;
  • establish appropriate controller roles for a PHARE type environment;
  • refine the method by which aircraft without datalink are controlled within a PHARE type concept.

For further information

PHARE Demonstration 1++ is documented in the following:
  Acrobat 98-70-16 PD/1++ Trial Report651 Kb
  Acrobat 98-70-16 PD/1++ Trial Report Appendix A Fast-Time Study78 Kb
  Acrobat 98-70-16 PD/1++ Trial Report Appendix B Temporary Operating Instructions36 Kb
  Acrobat 98-70-16 PD/1++ Trial Report Appendix C Trial Design, Data Collection and Analysis Plan107 Kb
  Acrobat 98-70-16 PD/1++ Trial Report Appendix D Results of the PD/1++ Trial154 Kb
  Acrobat 98-70-16 PD/1++ Trial Report Appendix E Usability Results of the PD/1++ Trial595 Kb