Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990rasc...25..865a&link_type=abstract
Radio Science (ISSN 0048-6604), vol. 25, Sept.-Oct. 1990, p. 865-881.
Physics
5
Planetary Meteorology, Titan, Wind Measurement, Wind Profiles, Zonal Flow (Meteorology), Cassini Mission, Doppler Effect, Iterative Solution
Scientific paper
A program, called the Cassini mission, intended to study the Saturn system by utilizing a Saturn orbiter and a probe descending to the surface of Titan, is discussed. Winds are expected to cause perturbations to the probe local horizontal velocity, resulting in an anomalous drift in the probe location and a shift in the frequency of the probe telemetry, due to the Doppler effect. By using an iterative algorithm, in which the time variation of the probe telemetry frequency is monitored throughout the descent, and the probe trajectory is updated to reflect the effect of wind on the probe location, a highly accurate relative wind profile can be recovered. By adding a single wind velocity, measured by independent means, an absolute wind profile can be obtained. However, the accuracy of the zonal winds recovery is limited by errors in trajectory, and frequency.
Atkinson David H.
Pollack James B.
Seiff Alvin
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