Task Modeling for Lunar Landing Redesignation
Author(s)
Chua, Zarrin K.
Major, Laura M.
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Abstract
Man's return to the Moon requires advancement in landing technology to achieve safe
and precise landing. The Autonomous Landing and Hazard Avoidance Technology project is
developing an autonomous flight manager (AFM) to provide the capability of assisting the
crew during critical landing phases, beyond the standard guidance, navigation, and control.
One such phase is landing point redesignation (LPR), where the crew must select a safe
landing aim point. A task model is created to analyze the functions required for the LPR
task, the allocation of functions between crew and automation, and the information needed
by the crew. Three bottlenecks are found in the LPR task: the inability to rapidly compare
alternative aim points, the time penalty associated with changing internal mission objectives,
and the hindrance of communicating such a change to the AFM. The LPR task model
predicts a task execution time of 25 seconds for the best scenario, but implies design changes
are necessary to improve a task execution of 5 minutes in the worst scenario.
Implementation of the changes suggested in this paper will reduce crew workload and stress
during lunar landing, and increase overall system risk and reliability.
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Date
2009-04
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