Accession Number : ADA306573

Title :   Optimality of Aeroassisted Orbital Plane Changes.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Parish II, Michael S.

PDF Url : ADA306573

Report Date : DEC 1995

Pagination or Media Count : 110

Abstract : Future spacecraft designs and in particular military spacecraft may incorporate the use of synergetic orbital change maneuvers. The analysis of these maneuvers and their optimality is an area in which much work has been done but only a few questions have been answered. This thesis discusses the theoretical background for solving the optimal control problem. A framework is set forth for the formulation of the overall problem which must be solved. Pontryagin's Maximum Principle is applied to obtain the necessary conditions for maximizing the inclination change for a given amount of propellant. Effects of a heating rate constraint imposed by the thermal protection system are considered. The Program to Optimize Simulated Trajectories (POST) is used to obtain results for the Maneuverable Reentry Research Vehicle (MRRV) to illustrate certain points. Two characterizations of the atmospheric pass are analyzed and compared to previous work, namely Aerobang and Aerocruise. A discussion on the limited use of POST as a direct method of analysis is also included.

Descriptors :   *MILITARY SATELLITES, *TRANSFER TRAJECTORIES, CONTROL, SIMULATION, ORBITS, OPTIMIZATION, THEORY, THESES, SYNERGISM, HEAT RESISTANT MATERIALS, MANEUVERABLE REENTRY VEHICLES.

Subject Categories : Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE