File(s) under permanent embargo

Reason: This item is currently closed access.

UAV conflict detection and resolution using probabilistic approach

conference contribution
posted on 15.06.2015, 12:34 by Hd Oh, Jung-Woo Park, Min-Jea Tahk
This paper presents a real-time conflict detection and resolution algorithm based on a probabilistic method. It is assumed that aircraft are linked by real time data link like ADS-B. The approach uses a set of probability density functions that describe uncertainties from ADS-B. To calculate the probability of conflict, we use probabilistic method by using Monte Carlo simulations. Monte Carlo simulations are often thought of as too slow for real-time usage. However, in this paper, we use geometric based Monte Carlo simulations which allow for reducing computation time considerably. From the probability of conflict obtained, ‘Threat Level’ is determined between two aircraft, then, one of possible resolution maneuver options is chosen to minimize the probability of conflict. Resolution maneuver chosen as three-axis acceleration commands is added to the current acceleration and transformed into the control inputs. While the probability of conflict is in threat level zero, own aircraft is guided to the way-point. For guidance to the waypoint, proportional navigation guidance law is used. The paper finishes with several multiple-aircraft encounter simulations, illustrating the performance and properties of the proposed algorithm.


This study has been supported by Ministry of Knowledge Economy under Smart UAV development project.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Aeronautical and Automotive Engineering

Published in

2008 KSAS-JSASS Joint Symposium on Aerospace Engineering


OH, H., PARK, J.-W. and TAHK, M.-J., 2008. UAV conflict detection and resolution using probabilistic approach. IN: Proceedings of KSAS-JSASS Joint International Symposium on Aerospace Engineering, 528-531.


The Korean Society for Aeronautical & Space Sciences


AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at:

Publication date



This conference paper is closed access.




Loughborough Publications