Guidance and control during direct-descent parabolic reentry
Edwin C. Foudriat, Rodney C. Wingrove, Langley Research Center, Ames Research Center, United States. National Aeronautics and Space Administration
National Aeronautics and Space Administration, 1961 - Technology & Engineering - 24 pages
"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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acceleration addition aerodynamic altitude rate analog computer avoid skip bank angle block diagram control inputs CONTROL IS STARTED control of range control procedure control the vehicle corridor width cross ranges available density altitude design maximum deceleration desired destination DIRECT-DESCENT TRAJECTORY DOWN-RANGE CAPABILITY Earth's Atmosphere entrance-angle limits entry angles escape speeds feedback control feedback loop flight path Foudriat ft/sec g UNITS gain factor Guidance and Control guidance system indicated in figure inertial reference instrument display landing point lift-drag ratio linear prediction technique long ranges maximum range method minimum NASA TN nondimensional oscilloscope parabolic orbit parabolic reentry PILOT-CONTROLLED piloted procedure piloted simulator study prediction system predictor presented range capability range error RANGE EXTENSION reentry conditions refs reentry from parabolic reentry guidance reentry procedures reference 13 reference trajectory techniques Rodney satellite velocity shown in figure STORED TRAJECTORIES superorbital target TRAJECTORY CONTROL Vehicle Entering vehicle's velocity and flight Wingrove