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guidance, flight mechanics and trajectory optimization

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ABSTRACT<br />

This Monograph is intended to present a discussion of the principles <strong>and</strong><br />

techniques of accomplishing a rendezvous between two spacecraft. In the con-<br />

text here, rendezvous is considered as the interface between the midcourse<br />

corrections of an orbital transfer maneuver which establishes the two space-<br />

craft on nearly identical orbits <strong>and</strong> the docking maneuver which results in the<br />

physical contact of the two spacecraft. First consideration in the discussion<br />

is given to the development of the equations of relative motion of the two<br />

vehicles. To facilitate the use in <strong>guidance</strong> scheme, these equations are<br />

developed in various coordinate systems, with several choices for the inde-<br />

pendent variables, <strong>and</strong> with several simplifying assumptions. Next, <strong>guidance</strong><br />

schemes are developed based on these equations of motion. As each <strong>guidance</strong><br />

scheme is presented, its existence is in some way justified <strong>and</strong> the relative<br />

advantages <strong>and</strong> disadvantages as compared to the other schemes discussed. With<br />

this discussion enough information is available so that the elements of a<br />

rendezvous <strong>guidance</strong> scheme can be constructed for a particular set of condi-<br />

tions in which a rendezvous maneuver is required.<br />

NAA acknowledges the effort of the following persons in the preparation<br />

of this Monograph.<br />

Mr. H. A. McCarty, Program Manager<br />

Mr. G. E. Townsend, Project Engineer<br />

Mr. D. F. Bender, Author<br />

Mr. A. L. Blackford, Author<br />

Mrs. D. Ch<strong>and</strong>ler, MSFC Program Manager

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