An improved Venus gravity field from Doppler tracking of the PioneerVenus Orbiter and Magellan spacecraft
| Autor: | G. R. Kronschnabl, M. S. Ryne, J. B. Mcnamee |
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| Rok vydání: | 1992 |
| Předmět: |
Physics
Spacecraft biology business.industry Astronomy Venus Orbital mechanics biology.organism_classification Aerobraking law.invention Orbiter symbols.namesake Gravitational field law Physics::Space Physics symbols Astrophysics::Earth and Planetary Astrophysics Spacecraft magnetometer business Doppler effect |
| Zdroj: | Astrodynamics Conference. |
| DOI: | 10.2514/6.1992-4666 |
| Popis: | A total of 365,000 Pioneer Venus Orbiter (PVO) S-band Doppler data points were fit in arcs ranging from one to four revolutions in length by estimating the spacecraft position and velocity, atmospheric density, and a solar pressure parameter at each arc epoch. The resultant converged PVO orbits were used to produce 194 information arrays for the Venus spherical harmonic coefficients complete to degree and order 21. A similar procedure was used to produce a second set of 72 information arrays for a 21 x 21 gravitational field from a limited, but global, sampling of Magellan S- and X-band data from cycles 1 and 2. The PVO and Magellan information arrays were combined and solved to obtain the 21 x 21 spherical harmonic expansion designated JPL-Venus Gravity Model 6A (VGM6A). The VGM6A harmonic field field produced significant improvements in the Doppler residual statistics obtained from field validation fits to both PVO and Magellan tracking data in comparison with alternative representations of Venus gravity. |
| Databáze: | OpenAIRE |
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