Methodology for prototyping increased levels of automation for spacecraft rendezvous functions

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Title: Methodology for prototyping increased levels of automation for spacecraft rendezvous functions
Author: Hart, Jeremy Jay
Abstract: The Crew Exploration Vehicle (CEV ) necessitates higher levels of automation than previous NASA vehicles due to program requirements for automation , including Automated Rendezvous and Docking (AR &D ) . Studies of spacecraft development often point to the locus of decision -making authority between humans and computers (i .e . automation ) as a prime driver for cost , safety , and mission success . Therefore , a critical component in the CEV development is the determination of the correct level of automation . To identify the appropriate levels of automation and autonomy to design into a human space flight vehicle , NASA has created the Function -specific Level of Autonomy and Automation Tool (FLOAAT ) . This research develops a methodology for prototyping increased levels of automation for spacecraft rendezvous functions . This methodology was used to evaluate the accuracy of the FLOAAT -specified levels of automation , via prototyping . Two spacecraft rendezvous planning tasks were selected and then prototyped in Matlab using Fuzzy Logic (FL ) techniques and existing Shuttle rendezvous trajectory algorithms . The prototyped functions are the determination of the maximum allowable Timeof - IGnition (TIG ) slip for a rendezvous phasing burn and the evaluation of vehicle position relative to Transition initiation (Ti ) position constraints . The methodology for prototyping rendezvous functions at higher levels of automation is judged to be a promising technique . The results of the prototype indicate that the FLOAAT recommended level of automation is reasonably accurate and that FL can be effectively used to model human decision -making used in spacecraft rendezvous . FL has many desirable attributes for modeling human decision -making , which makes it an excellent candidate for additional spaceflight automation applications . These conclusions are described in detail as well as recommendations for future improvements to the FLOAAT method and prototyped rendezvous functions .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1220
Date: 2009-05-15

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Methodology for prototyping increased levels of automation for spacecraft rendezvous functions. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1220 .

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