Fixed-trim re-entry guidance analysisThe terminal guidance problem for a fixed-trim re-entry body is formulated with the objective of synthesizing a closed-loop steering law. A transformation of variables and subsequent linearization of the motion, with the sight-line to the target as a reference, reduces the order of the state system for the guidance problem. The reduced order system, although nonlinear and time-varying, is simple enough to lend itself to synthesis of a class of guidance laws. A generalization of the feedforward device of classical control theory is successfully employed for compensation of roll autopilot lags. The proposed steering law exhibits superior miss-distance performance in a computational comparison with existing fixed-trim guidance laws.
Document ID
19810059680
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Gracey, C. (NASA Langley Research Center Hampton, VA, United States)
Cliff, E. M. (NASA Langley Research Center Hampton, VA, United States)
Lutze, F. H. (NASA Langley Research Center Hampton, VA, United States)
Kelley, H. J. (Virginia Polytechnic Institute and State University Blacksburg, VA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking