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An Alternative Time Metric to Modified Tau for Unmanned Aircraft System Detect And AvoidA new horizontal time metric, Time to Protected Zone, is proposed for use in the Detect and Avoid (DAA) Systems equipped by unmanned aircraft systems (UAS). This time metric has three advantages over the currently adopted time metric, modified tau: it corresponds to a physical event, it is linear with time, and it can be directly used to prioritize intruding aircraft. The protected zone defines an area around the UAS that can be a function of each intruding aircraft's surveillance measurement errors. Even with its advantages, the Time to Protected Zone depends explicitly on encounter geometry and may be more sensitive to surveillance sensor errors than modified tau. To quantify its sensitivity, simulation of 972 encounters using realistic sensor models and a proprietary fusion tracker is performed. Two sensitivity metrics, the probability of time reversal and the average absolute time error, are computed for both the Time to Protected Zone and modified tau. Results show that the sensitivity of the Time to Protected Zone is comparable to that of modified tau if the dimensions of the protected zone are adequately defined.
Document ID
20170006093
Acquisition Source
Ames Research Center
Document Type
Conference Paper
External Source(s)
Authors
Wu, Minghong G.
(NASA Ames Research Center Moffett Field, CA United States)
Bageshwar, Vibhor L.
(Honeywell Aerospace Golden Valley, MN, United States)
Euteneuer, Eric A.
(Honeywell Aerospace Golden Valley, MN, United States)
Date Acquired
July 6, 2017
Publication Date
June 5, 2017
Subject Category
Air Transportation And Safety
Report/Patent Number
ARC-E-DAA-TN42604
AIAA Paper 2017-4383
Meeting Information
Meeting: AIAA Aviation Technology, Integration, and Operations Conference
Location: Denver, CO
Country: United States
Start Date: June 5, 2017
End Date: June 9, 2017
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
UAS
time metric
alert
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