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REPORT DATE (DD-MM-YY)
February 2004
REPORT TYPE
Conference Paper Preprint
DATES COVERED (From ■ To)
TITLE AND SUBTITLE
FLIGHT TEST RESULTS OF AN ADAPTIVE GUIDANCE SYSTEM FOR REUSABLE LAUNCH VEHICLES
AUTHOR(S)John D. Schierman, Neha Gandhi, Jason R. Hull, and David G. Ward
PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Barron Associates, Inc. 1160 Pepsi Place, Suite 300 Charlottesville, VA 22901-0807
SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air
DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited.
SUPPLEMENTARY NOTESConference paper to be presented at the AIAA Guidance, Navigation and Control Conference, Providence, RI, August 4, 2004. This paper was produced under a SBIR contract. © 2004 Barron Associates, Inc. This work is copyrighted. The United States has for itself and others acting on its behalf an unlimited, paid-up, nonexclusive, irrevocable worldwide license. Any other form of use is subject to copyright restrictions.
ABSTRACTTo enable autonomous operations in future Reusable Launch Vehicles (RLVs), reconfigurable control and adaptive guidance will often be required to facilitate recovery of the mission following a major anomalous event such as an effector failure. An adaptive guidance system that works in conjunction with a reconfigurable controller and an autonomous trajectory command reshaping algorithm is presented. The guidance law utilizes a backstepping architecture to generate pitch rate commands that drive the inner-loop control system. Under extreme failure conditions the control surfaces can saturate in an attempt to meet commanded moments. In these cases, the guidance feedback gains are reduced to preserve stability margins in the guidance loops. A case study is presented that shows the benefits of the guidance gain adaptation. Without adjusting the gains, the guidance loops go unstable, whereas stability is maintained with gain reduction.
SUBJECT TERMSAdaptive Guidance, Reconfigurable Control
ABSTRACTTo enable autonomous operations in future Reusable Launch Vehicles (RLVs), reconfigurable control and adaptiv...