Abstract
The relative speeds of aircraft in possible conflict encounterare soaring up to or even above 0.5km/s, meaning that the periodof time which includes conflict detection, reaction, andstrategical resolution of conflict, etc., before initiation of conflictavoidance maneuvering is short. Therefore, and since currentground based systems for managing, controlling and handlingaircraft movements is near its maximum capacity, the existingground based control has to be enhanced by the autonomousanti-collision and anti-conflict airborne system. Avoidanceprocedures with descent in front of the intruder are demonstratedas a continuation of autonomous airborne separationresearch begun with conflict avoidance involving descentbehind the intruder. The following continuation is necessQ/ybecause descending behind the intruder is a safe avoidanceonly when initial vertical separation exceeds the defined verticalseparation minimum.References
Duong, V. N., Hoffman, E., Floc hie, L., Nicolaon, J. P.,
and Bossu, A. 'Extended Rules-of-the-Air to Apply to
the Resolution of Encounters in Autonomous Airborne
Separation.' Eurocontrol Experimental Cent er Report,
EEC, Paris, 1996.
Geisinger, K. E. 'Airspace Conflict Equations.' Transportation
Science, 19(2), 1985.
Hager, G. 'European ACAS Operational Evaluation -
Final Report.' Eurocontrol EEC Report No. 316, 1997.
Hoekstra, J., van Gent, R., and Groeneweg. 'Airborne
SeparationAssurance Validation With Multiple Humans-
in-the-Loop.' 5'11 USA/Europe Air Traffic Management
R&D Seminar, Budapest, Hungary, 2003.
(5] Krozel, J., Mueller, T., and Hunter, G. 'Free Flight
Conflict Detection and Resolution Analysis.' Proc.
AIAA Guidance, Navigation and Control Conf., San
Diego, CA, 1996.
Kuchar, J. K., and Yang, L. C. 'Swvey of Conflict
Detection and Resolution Modeling Methods.' 1' USN
/Europe Air Traffic Management R&D Seminar,
Saclay, France, 1997.
(7] Mackintosh, M-A., Dun bar, M., Lozito, S., Cashion, P.,
McGann, A., and Dulchinos, V., Ruigrok, R., Hoekstra,
J., and Van Gent, R. 'Self-Separation from the Air and
Ground Perspective.' NASA Ames Research Cent er.
'd USA/Europe Air Traffic Management R&D Seminar,
Orlando, Fl., 1998.
Magister, T. 'Conflict Detection and Resolution in the
Vicinity of the Top of Descent Point.' Promet-Traffic-
Traffico, 14(6), 2002.
Magister, T. 'Conflict Avoidance by Descent Behind the
Intruder.' Promet-Traffic-Traffico, 16(2), 2004.
Ratcliffe, S. 'Free Flight for Air Traffic in Europe.' The
Journal of Navigation, 52(2), 1999.