Arid
DOI10.1016/j.icarus.2013.04.017
Modeling the SAR backscatter of linear dunes on Earth and Titan
Paillou, Ph.1; Bernard, D.1; Radebaugh, J.2; Lorenz, R.3; Le Gall, A.4; Farr, T.5
通讯作者Paillou, Ph.
会议名称3rd International Planetary Dunes Workshop
会议日期JUN 12-15, 2012
会议地点Flagstaff, AZ
英文摘要

We modeled the Synthetic Aperture Radar (SAR) response of linear dunes of the Great Sand Sea in Egypt using a single surface scattering term, based on Integral Equation and Physical Optics Models. Using multi-frequency SIR-C/X-SAR radar scenes and topography obtained from the Shuttle Radar Topography Mission (SRTM), we were able to estimate reasonable values for the parameters describing the surface roughness of the dunes. As the linear dunes of the Great Sand Sea are relevant analogs for the linear dunes observed on Titan by the Cassini Radar instrument, these results were thus used as a starting point to simulate the radar response of Titan's dunes, as imaged by the Radar instrument onboard the Cassini spacecraft during the T8 flyby in October 2005. We show that a single surface scattering term is not sufficient to simulate the radar signal backscattered by the dunes on Titan: one has to add a diffuse scattering term, indicating that Titan's dunes are likely to have somewhat inhomogeneous internal structures related to porosity and/or internal layering. Our results also indicate that the dunes on Titan should be close to perfectly smooth, possibly because of the formation of smaller ripples than on Earth, plus smoothing resulting from precipitation events. (C) 2013 Elsevier Inc. All rights reserved.


英文关键词Titan Titan surface Radar observations Earth
来源出版物ICARUS
ISSN0019-1035
EISSN1090-2643
出版年2014
卷号230
页码208-214
出版者ACADEMIC PRESS INC ELSEVIER SCIENCE
类型Article;Proceedings Paper
语种英语
国家France;USA
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000330333100018
WOS关键词CASSINI RADAR ; IMAGING RADAR ; SAND DUNES ; SURFACE ; SPACEBORNE ; SCATTEROMETRY ; DESERT ; SAHARA ; IMAGES ; MAPPER
WOS类目Astronomy & Astrophysics
WOS研究方向Astronomy & Astrophysics
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/302673
作者单位1.Univ Bordeaux, UMR 5804, LAB, F-33270 Floirac, France;
2.Brigham Young Univ, Dept Geol Sci, Provo, UT 84602 USA;
3.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA;
4.Univ Versailles, LATMOS, F-78280 Guyancourt, France;
5.CALTECH, Jet Prop Lab, Div Earth & Space Sci, Pasadena, CA 91109 USA
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Paillou, Ph.,Bernard, D.,Radebaugh, J.,et al. Modeling the SAR backscatter of linear dunes on Earth and Titan[C]:ACADEMIC PRESS INC ELSEVIER SCIENCE,2014:208-214.
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