SAR - An instrument for planetary geodesy and navigation

Details SAR - An instrument for planetary geodesy and navigation SAR - An instrument for planetary geodesy and navigation

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aiaa.confv....m&link_type=abstract

American Astronautical Society and American Institute of Aeronautics and Astronautics, Astrodynamics Specialist Conference, Prov

Astronomy and Astrophysics

Astronomy

Geodesy, Planetary Surfaces, Planetocentric Coordinates, Radar Imagery, Radar Navigation, Synthetic Aperture Radar, Venus Probes, Accuracy, Altimeters, Atmospheric Refraction, Circular Orbits, Data Reduction, Error Analysis, Imaging Techniques, Spacecraft Orbits

Scientific paper

Analysis to define an optimal data plan and to define achievable accuracy levels in determination of the physical parameters, global topography of the planet, and refined orbital element estimates of a spacecraft borne synthetic aperture radar (SAR) placed in a near polar circular orbit of 300 km altitude around the planet Venus is presented. It is shown that radar surface images can be used to improve knowledge of physical parameters of Venus, and the improvement in orbit accuracy can reduce navigational uncertainties derivable from conventional Doppler ratio tracking data, yielding a more precise history of the orbits for sensing the low order gravity field of the planet. Data plan strategies in terms of selection of ground points and their spatial distribution are related to achievable accuracy of the solution parameters, and the influence of spacecraft orbit errors on the solution accuracy was discussed.

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