Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979vina.nasa..109h&link_type=abstract
In its Viking Navigation p 109-152 (SEE N80-21397 12-15)
Physics
Orbit Calculation, Spacecraft Orbits, Viking 1 Spacecraft, Viking 2 Spacecraft, Gravitational Effects, Interplanetary Navigation, Mars (Planet), Planet Ephemerides, Spacecraft Maneuvers
Scientific paper
The determination of the Mars-centered ephemerides of the Viking Orbiters and positions of the Landers from two way Doppler and range data is described. An overview of mission satellite orbit determination functions and methods is given. Topics covered include: postmaneuver orbit convergence, local orbit knowledge accuracies, the effects of interplanetary media, use of constrained solutions, and solving through trim burns. Procedure and results relevant to the determination of the planet gravity field are included. Results relative to sensing Mars' gravity field during the extended mission are presented along with a discussion of the Phobos Flyby Experiment conducted during February 1977.
Boggs Dale H.
Born George H.
Christensen David H.
Hildebrand C. E.
Shippony Z.
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