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Identifying Contingency Requirements using Obstacle Analysis on an Unpiloted Aerial VehicleThis paper describes experience using Obstacle Analysis to identify contingency requirements on an unpiloted aerial vehicle. A contingency is an operational anomaly, and may or may not involve component failure. The challenges to this effort were: ( I ) rapid evolution of the system while operational, (2) incremental autonomy as capabilities were transferred from ground control to software control and (3) the eventual safety-criticality of such systems as they begin to fly over populated areas. The results reported here are preliminary but show that Obstacle Analysis helped (1) identify new contingencies that appeared as autonomy increased; (2) identify new alternatives for handling both previously known and new contingencies; and (3) investigate the continued validity of existing software requirements for contingency handling. Since many mobile, intelligent systems are built using a development process that poses the same challenges, the results appear to have applicability to other similar systems.
Document ID
20090026393
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Lutz, Robyn R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Nelson, Stacy
Patterson-Hine, Ann
(NASA Ames Research Center Moffett Field, CA, United States)
Frost, Chad R.
(NASA Ames Research Center Moffett Field, CA, United States)
Tal, Doron
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 24, 2013
Publication Date
May 21, 2005
Subject Category
Avionics And Aircraft Instrumentation
Meeting Information
Meeting: International Conference on Software Engineering
Location: Missouri
Country: United States
Start Date: May 15, 2005
End Date: May 21, 2005
Sponsors: Institute of Electrical and Electronics Engineers
Funding Number(s)
CONTRACT_GRANT: NSF-0204139
CONTRACT_GRANT: NSF-0205588
Distribution Limits
Public
Copyright
Other
Keywords
fault protection
requirements
rotorcraft
contingency

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