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NASA Controller Acceptability Study 1(CAS-1) Experiment Description and Initial ObservationsThis paper describes the Controller Acceptability Study 1 (CAS-1) experiment that was conducted by NASA Langley Research Center personnel from January through March 2014 and presents partial CAS-1 results. CAS-1 employed 14 air traffic controller volunteers as research subjects to assess the viability of simulated future unmanned aircraft systems (UAS) operating alongside manned aircraft in moderate-density, moderate-complexity Class E airspace. These simulated UAS were equipped with a prototype pilot-in-the-loop (PITL) Detect and Avoid (DAA) system, specifically the Self-Separation (SS) function of such a system based on Stratway+ software to replace the see-and-avoid capabilities of manned aircraft pilots. A quantitative CAS-1 objective was to determine horizontal miss distance (HMD) values for SS encounters that were most acceptable to air traffic controllers, specifically HMD values that were assessed as neither unsafely small nor disruptively large. HMD values between 0.5 and 3.0 nautical miles (nmi) were assessed for a wide array of encounter geometries between UAS and manned aircraft. The paper includes brief introductory material about DAA systems and their SS functions, followed by descriptions of the CAS-1 simulation environment, prototype PITL SS capability, and experiment design, and concludes with presentation and discussion of partial CAS-1 data and results.
Document ID
Document Type
Technical Memorandum (TM)
Chamberlain, James P.
(NASA Langley Research Center Hampton, VA, United States)
Consiglio, Maria C.
(NASA Langley Research Center Hampton, VA, United States)
Comstock, James R., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Ghatas, Rania W.
(NASA Langley Research Center Hampton, VA, United States)
Munoz, Cesar
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
June 17, 2015
Publication Date
May 1, 2015
Subject Category
Air Transportation And Safety
Report/Patent Number
Funding Number(s)
WBS: WBS 475122.
Distribution Limits
Work of the US Gov. Public Use Permitted.
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