CALLAHAN, P. S.; HENSLEY, S.; GIM, Y.; JOHNSON, W. T.; LORENZ, R. D.; ALBERTI, Giovanni; OROSEI, R.; SEU, R.; FRANCESCHETTI, G.; PAILLOU, Philippe; PAGANELLI, F.; WALL, S.; WEST, R. D.

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CALLAHAN, P. S.
Jet Propulsion Laboratory [JPL]

HENSLEY, S.
Jet Propulsion Laboratory [JPL]

GIM, Y.
Jet Propulsion Laboratory [JPL]

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Ce document a été publié dans

2006AGUFM.P13A0165C - American Geophysical Union, Fall Meeting 2006, abstract #P13A-0165, 2006.

Résumé en anglais

We have examined range-compressed waveforms from the Cassini Radar operating in altimeter mode (Ku band, bandwidth 4.25 MHz, nadir pointing) during observations of Titan. We find that leading edge detection provides a straight forward determination of a maximum surface height. The heights from the set of observations give a mean radius of Titan about 0.5 km larger than the nominal 2575+/-0.5 km determined from Voyager. The altimeter footprint diameter is about 25 km on the surface and thus represents an average over the terrain. The waveforms are complex beyond the leading edge. We have performed simulations over various sized dunes and other terrain and find reasonable agreement with the signal observed from several regions, consistent with the published report of dunes. We have developed several measures of waveform width and complexity to characterize the surface. We display the consistency among these measures and compare them to other characterizations of the surface.< Réduire

Mots clés en anglais

5464 Remote sensing

5470 Surface materials and properties

5494 Instruments and techniques

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Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804