Computer Science – Sound
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p23a1623h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P23A-1623
Computer Science
Sound
[0694] Electromagnetics / Instruments And Techniques, [5422] Planetary Sciences: Solid Surface Planets / Ices, [6225] Planetary Sciences: Solar System Objects / Mars, [6297] Planetary Sciences: Solar System Objects / Instruments And Techniques
Scientific paper
The advent of orbital radar sounding has literally added a new dimension to studies in planetary science. The ability to probe the subsurface of Mars has resulted in new constraints on the composition and history of the polar deposits and the detection of buried mid-latitude ice, among other discoveries. These findings have primarily been accomplished through the 1-d or 2-d analysis of orbital-track-based observations. Considerably more information can be obtained from the 3-d gridding of subsurface interfaces derived from multiple, intersecting orbital tracks. This is especially important in the polar layered deposits where complex structures in the shallow subsurface are evident, resulting from depositional and erosional processes intimately linked to climate. However, most studies to date have assumed that primary surface and subsurface echoes arise from within the first Fresnel zone, centered at the sub-nadir point, with secondary surface returns arising from more distant cross-track features (i.e., surface clutter). As an extension of our clutter analysis for Shallow Radar (SHARAD) data from Mars Reconnaissance Orbiter, we analyzed surface slope effects on primary echo locations, with Mars Orbiter Laser Altimetry (MOLA) data as our source of topography. We have found that the sub-nadir assumption for primary surface echo locations is invalid for much of Mars. Long-wavelength, cross-track surface slopes often result in primary echo locations that are more than a few first-Fresnel-zone diameters (i.e., >10 km) from the sub-nadir point. Without compensating for this effect, resulting subsurface interface geometries are inaccurate and can lead to significant misinterpretation. We have therefore developed the means to properly locate the primary surface echo for any orbital radar observation and have implemented an algorithm to correct for the location of subsurface interfaces. This algorithm results in accurate, 3-d subsurface interface geometries (within the uncertainties inherent to the radar and topographic model) and allows for a new generation of studies linking subsurface structure to geologic processes. Recognizing and quantifying this effect is also critical when interpreting track-based, 2-d data over small features such as lobate debris aprons and pedestal craters, and will be important when considering future radar sounding missions where the surface topography may not be well known.
Choudhary Prateek
Christian S.
Holt Jeremy William
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