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Ensuring Interoperability Between Unmanned Aircraft Detect-and-Avoid and Manned Aircraft Collision AvoidanceThe Unmanned Aircraft Systems (UAS) community in the United States has identified the need for a collision avoidance region in which UAS Detect-and-Avoid (DAA) vertical guidance is restricted to preclude interoperability issues with manned aircraft collision avoidance system vertical resolution advisories (RAs). This paper documents the process by which the collision avoidance region was defined. Three candidate definitions were evaluated on 1.3 million simulated pairwise encounters between UAS and manned aircraft covering a wide range of horizontal and vertical closure rates, angles, and miss distances. Each definition was evaluated with regard to UAS DAA interoperability with manned aircraft collision avoidance in terms of how well it achieved: 1) the primary objective of restricting DAA vertical guidance prior to RAs when the aircraft are close, and 2) the secondary objective of avoiding unnecessary restrictions of DAA vertical guidance at DAA alerts when the aircraft are further apart. The collision avoidance region definition that fully achieves the primary objective and best achieves the secondary objective was recommended to and accepted by the UAS community in the United States. By this definition, UAS and manned aircraft are in the collision avoidance region where DAA vertical guidance is restricted when the time to closest point of approach (CPA) is less than 50 seconds and either the time to co-altitude is less than 50 seconds or the current vertical separation is less than 800 feet.
Document ID
20180000588
Acquisition Source
Ames Research Center
Document Type
Presentation
Authors
Thipphavong, David
(NASA Ames Research Center Moffett Field, CA, United States)
Cone, Andrew
(NASA Ames Research Center Moffett Field, CA, United States)
Lee, Seungman
(Universities Space Research Association Moffett Field, CA, United States)
Date Acquired
January 17, 2018
Publication Date
June 26, 2017
Subject Category
Air Transportation And Safety
Computer Systems
Report/Patent Number
ARC-E-DAA-TN49879
Meeting Information
Meeting: Air Traffic Management Research and Development (ATM R&D) Seminar
Location: Seattle, WA
Country: United States
Start Date: June 26, 2017
End Date: June 30, 2017
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NNA16BD14C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
unmanned aircraft systems; collision avoidance; interoperabilit
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