Guidance and control during direct-descent parabolic reentry

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National Aeronautics and Space Administration, 1961 - Technology & Engineering - 24 pages
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"The results of studies of four reentry guidance and control techniques for the energy management of vehicles returning to the earth at escape speeds are compared in this paper. The reentry trajectories are constrained to those of direct descent, that is, where the vehicle does not leave that portion of the atmosphere where useful aerodynamic forces are available after its initial entry. The guidance techniques compared are (1) a piloted simulator study reference trajectory techniques (2) An automatic controller using reference trajectory techniques (3) A predictor system employing linear prediction (perturbation) techniques and (4) A repetitive prediction system employing rapid-time computer techniques."--P. 1.

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