Computer Science – Performance
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5604l&link_type=abstract
American Astronomical Society, DPS meeting #38, #56.04; Bulletin of the American Astronomical Society, Vol. 38, p.585
Computer Science
Performance
Scientific paper
The Huygens landing site on Titan was not expected to be observed with SAR imaging by the Cassini RADAR until late in the nominal tour. However, better-than-expected performance, permitting operation at higher altitudes and thus over longer times than originally anticipated, has permitted two observations of the landing site.
The first was an extension to the 5-beam SAR swath on T8 (October 2005) from altitudes of 4000km to 5000km ; the second was an experimental observation at an altitude range of 10,000km-13,000km using custom pointing and SAR-processing only the central high-gain beam. The latter 'experimental' observation opens a new capability (see also the abstract by West et al) for observing targets of interest with a resolution of approximately 1-2km.
Here we compare the two images, which have slightly different incidence angles and look azimuths, noting correlations and differences. These can also be compared with the optical image mosaic from the Huygens descent imager DISR. Some correlations exist (notably the two prominent dark lines - linear sand dunes) but there are many differences.
Additional information on the radar properties of the landing site can be derived from the Huygens radar altimeter, and the intensity of the probe's radio signal received as Cassini set on the horizon, a fortuitous bistatic scattering experiment.
Cassini RADAR Team
Lorenz Ralph
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