Determining Minimum Separation Boundary for UAM Tactical Deconfliction

Junsoo Kim, Gihun Nam, Dongchan Min, Noah Minchan Kim, and Jiyun Lee

Peer Reviewed

Abstract: Urban air mobility (UAM) is an emerging paradigm in future mobility that utilizes the airspace above urban areas and incorporates innovative technologies to provide safe and efficient transportation. However, as UAM reaches maturity, the increased density in constrained airspace will raise safety concerns, particularly the risk of mid-air collisions (MAC). This emphasizes the importance of deconfliction in ensuring safe separations from other aircraft and static obstacles. Deconfliction includes strategic and tactical parts, which refer to pre-flight and in-flight deconfliction, respectively. Conventional aircraft perform deconfliction using sufficiently spaced-out separation in wide airspace. Applying these extensive separation boundaries to UAM, however, could significantly compromise airspace efficiency. Therefore, it is necessary to determine a tightened separation boundary that enhances airspace efficiency while still meeting the safety requirement. Building on our previous research, which introduced a concept for a minimum separation boundary focusing on the strategic deconfliction, this study extends the scope to include the tactical deconfliction. The tactical deconfliction utilizes the detect-and-avoid (DAA) system to mitigate collisions when the strategic deconfliction fails. This study proposes a methodology for determining the minimum separation boundary for the tactical deconfliction, focusing on two key parameters representing the performance of the DAA system. Additionally, a case study was conducted by applying the proposed methodology to an airborne collision avoidance system X (ACAS X), a promising DAA system suitable for UAM. The results demonstrate that implementing the tactical deconfliction could reduce the separation boundary by 12% compared to scenarios without it.
Published in: Proceedings of the ION 2024 Pacific PNT Meeting
April 15 - 18, 2024
Hilton Waikiki Beach
Honolulu, Hawaii
Pages: 502 - 513
Cite this article: Kim, Junsoo, Nam, Gihun, Min, Dongchan, Kim, Noah Minchan, Lee, Jiyun, "Determining Minimum Separation Boundary for UAM Tactical Deconfliction," Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024, pp. 502-513.
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