Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988tdar.nasa....1l&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 1-12 (SEE N88-18774 11-32)
Astronomy and Astrophysics
Astronomy
Calibrating, Errors, Radio Astronomy, Radio Transmission, Rangefinding, Very Long Base Interferometry, Earth Orbits, Mars (Planet), Phobos, Planetary Orbits, Radio Interferometers, Soviet Spacecraft
Scientific paper
The Soviet Phobos Lander mission will place two spacecraft on the Martian moon Phobos in 1989. Measurements of the range from Earth-based stations to the landers will allow an accurate determination of the ephemerides of Phobos and Mars. Delta Very Long Base Interferometry (VLBI) between the landers and compact radio sources nearby on the sky will be used to obtain precise estimates of the angular offset between the radio and planetary reference frames. The accuracy of this frame-tie estimate is expected to be in the vicinity of 10 mrad, depending on how well several error sources can be controlled (calibrated or reduced). Many candidate radio sources for VLBI measurements were identified, but additional work is necessary to select those sources which have characteristics appropriate to the present application. Strategies for performing the source selection are described.
Linfield Roger
Ulvestad Jim
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