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A simplified guidance algorithm for lifting aeroassist orbital transfer vehiclesThe derivation, logic, and performance of a simplified atmospheric guidance algorithm for aeroassist orbital-transfer vehicles (AOTVs) are presented. The algorithm was developed to meet the demands for an aerobraking trajectory guidance technique that was uncomplicated, easily integrated into existing trajectory programs, adaptable to a range of vehicle aerodynamic configurations, capable of performance equivalent to currently available guidance programs in compensating for dispersions in entry conditions, atmospheric conditions, and aerodynamic characteristics. The result was a hybrid lifting guidance algorithm combining the method of reference-profile generation with the method of predictor/corrector schemes. The resulting performance is good (less than 3 n.m. error from desired apogee despite uncertainties of + or - 50 percent atmospheric density, + or - 0.2 deg entry flight-path angle, or + or - 50 percent L/D. Combinations of these same dispersions with lesser magnitudes have also been successful, although performance with density 'pockets' within the atmosphere requires more analysis.
Document ID
19850037536
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cerimele, C. J.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Gamble, J. D.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Astrodynamics
Report/Patent Number
AIAA PAPER 85-0348
Accession Number
85A19687
Distribution Limits
Public
Copyright
Other

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