Computer Science
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992lpico.789q.112s&link_type=abstract
In Lunar and Planetary Inst., Papers Presented to the International Colloquium on Venus p 112 (SEE N93-14288 04-91)
Computer Science
Gravitational Fields, Pioneer Venus 1 Spacecraft, Planetary Gravitation, Spatial Resolution, Spherical Harmonics, Venus (Planet), Radio Signals, Superhigh Frequencies, Tracking Stations
Scientific paper
The first significant dataset to provide local measures of venusian gravity field variations was that acquired from the Pioneer Venus Orbiter (PVO) during the 1979-1981 period. These observations were S-band Doppler radio signals from the orbiting spacecraft received at Earth-based tracking stations. Early reductions of these data were performed using two quite different techniques. Estimates of the classical spherical harmonics were made to various degrees and orders up to 10. At that time, solutions of much higher degree and order were very difficult due to computer limitations. These reductions, because of low degree and order, revealed only the most prominent features with poor spatial resolution and very reduced peak amplitudes.
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