Other
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aiaa.confy....t&link_type=abstract
American Astronautical Society and American Institute of Aeronautics and Astronautics, Astrodynamics Specialist Conference, Prov
Other
Automatic Flight Control, Mars Environment, Planetary Orbits, Rendezvous Trajectories, Space Rendezvous, Terminal Guidance, Equations Of Motion, Manned Space Flight, Orbital Velocity, Spacecraft Guidance, Spacecraft Motion, Trajectory Control
Scientific paper
The autonomous (or unmanned) Mars Orbit Rendezvous may be divided into four phases: approach, terminal, station-keeping, and docking. The paper outlines a feasible concept for the terminal rendezvous phase. A co-apsidal terminal rendezvous technique is described which utilizes the advantages of aligning the lines of apsides of two coplanar elliptic orbits of slightly different periods but of the same apoapsis distance. An initial maneuver nulling the inclination between the orbits is followed by another maneuver to align the two lines of apsides. A proper phasing maneuver is then executed at the coapsidal point, and the final rendezvous maneuver is performed at the same coapsidal point to complete the terminal rendezvous transfer. Cases are formulated in order of complexity with a view to illustrate the basic ideas of this technique. Pertinent calculations are also presented.
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