Improving lunar return entry footprints using enhanced skip trajectory guidance

Z. R. Putnam, R. D. Braun, S. H. Bairstow, G. H. Barton

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The impending development of NASA's Crew Exploration Vehicle (CEV) will require a new entry guidance algorithm that provides sufficient performance to meet all requirements. This study examined the effects on entry footprints of enhancing the skip trajectory entry guidance used in the Apollo program. The skip trajectory entry guidance was modified to include a numerical predictor-corrector phase during atmospheric skip portion of the entry trajectory. Four degree-of-freedom simulation was used to determine the footprint of the entry vehicle for the baseline Apollo entry guidance and predictor-corrector enhanced guidance with both high and low lofting at several lunar return entry conditions. The results show that the predictor-corrector guidance modification significantly improves the entry footprint of the CEV for the lunar return mission. The performance provided by the enhanced algorithm is likely to meet the entry range requirements for the CEV.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - Space 2006 Conference
Number of pages15
StatePublished - Dec 1 2006
Externally publishedYes
EventSpace 2006 Conference - San Jose, CA, United States
Duration: Sep 19 2006Sep 21 2006

Publication series

NameCollection of Technical Papers - Space 2006 Conference


OtherSpace 2006 Conference
Country/TerritoryUnited States
CitySan Jose, CA

ASJC Scopus subject areas

  • Engineering(all)


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