Computer Science – Performance
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980fmet.symp.....w&link_type=abstract
In NASA. Goddard Space Flight Center Fifth Ann. Flight Mech./Estimation Theory Symp. 28 p (SEE N81-11070 02-13)
Computer Science
Performance
Earth-Mars Trajectories, Flyby Missions, Galileo Project, Space Navigation, Covariance, Doppler Navigation, Planet Ephemerides, Position Errors, Very Long Base Interferometry, Viking Lander 1
Scientific paper
A summary and evaluation of the Galileo-Mars flyby navigation techniques is presented. The navigational requirements of Galileo as it swings by Mars are going to be met with interferometric angular measurements (VLBI) and range and range-rate measurements. Like VLBI, dual spacecraft differenced range is less sensitive to Mars ephemeris errors and tracking station location errors than conventional range and Doppler. Similarly, differenced range provides angular information about the separation between the Mars Viking Lander I and the Galileo spacecraft. In covariance studies, dual spacecraft range coupled with conventional range and Doppler is shown to estimate the Galileo-Mars flyby distance to better than 10 km which is comparable to the VLBI performance. For the Galileo-Mars flyby, dual spacecraft differenced range promise to be an excellent backup to VLBI if the Mars Viking Lander remains operational.
Ananda M. P.
Nicholson F. T.
Walsh W. E.
Winn F. B.
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