Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p42a0570g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P42A-0570
Mathematics
Logic
0694 Instrumentation And Techniques, 0994 Instruments And Techniques, 5464 Remote Sensing, 5494 Instruments And Techniques
Scientific paper
Development of a miniaturized impulse ground penetrating radar (GPR) suitable for rover-deployment on Mars is well underway. The target operational depth for the GPR is 10-20 meters and is geared towards definition of stratigraphy, subsurface block distribution, and structure at the decimeter to meter scale needed for establishing geologic setting. Likely rover interface requirements influence target mass, power, and volume limits of 0.5 kg, 3W (peak), and 3400 cc, respectively. As an important step towards evaluating the potential of the GPR in geologic and operational settings analogous to Mars, data were collected at the site of the 2001 "blind" FIDO rover trials near Baker, CA. Rainfall occurring just prior to field work resulted in high moisture in the very conductive soils that limited radar performance. Nevertheless, data delineate local radar stratigraphy to several meters depth and provide critical context for interpretation of surface morphology as it relates to underlying pedogenic or lithologic stratigraphy and/or structure. Data were collected using a 400 MHz transducer and reveal that the blocky surface characterizing the site is created by a stone pavement that overlies a block-free horizon of eolian silt rather than bedrock. Moreover, data indicate that the underlying bedrock is variably weathered and is being incised and then thinly buried by a veneer of alluvium associated with an adjacent laterally migrating and aggrading wash. Field data from the FIDO site confirm that a rover-deployed GPR can directly measure the range and character of in situ radar properties, thereby helping constrain near-surface geology and structure. These GPR data can be used to infer the degree of post-depositional pedogenic alteration or weathering and enable assessment of pristine versus secondary morphology. Most importantly, GPR can provide geologic context for interpreting other rover instruments/data sets. Hence, rover-deployment of a GPR on Mars should permit 3-D mapping of local stratigraphy and guide subsurface sampling.
Arvidson Ray E.
Campbell Bruce A.
Grant Alex J.
Schutz Alan E.
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