期刊
PLANETARY AND SPACE SCIENCE
卷 103, 期 -, 页码 191-204出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2014.07.018
关键词
Radar; Ice; Surface; Landing; Roughness; Planets
资金
- University of Texas Institute for Geophysics (UTIG) Postodoctoral Fellowship Program
- G. Unger Vetlesen Foundation
- NASA grant [13-ICEE13-00018]
The potential for a nadir-looking radar sounder to retrieve significant surface roughness/permittivity information valuable for planetary landing site selection is demonstrated using data from an airborne survey of the Thwaites Glacier Catchment, West Antarctica using the High Capability Airborne Radar Sounder (HiCARS). The statistical method introduced by Grima et al. (2012. Icarus 220, 84-99. http://dx.doLorg/10.1007/s11214-012-9916-y) for surface characterization is applied systematically along the survey flights. The coherent and incoherent components of the surface signal, along with an internally generated confidence factor, are extracted and mapped in order to show how a radar sounder can be used as both a reflectometer and a scatterometer to identify regions of low surface roughness compatible with a planetary lander. These signal components are used with a backscattering model to produce a landing risk assessment map by considering the following surface properties: Root mean square (RMS) heights, RMS slopes, roughness homogeneity/stationarity over the landing ellipse, and soil porosity. Comparing these radar-derived surface properties with simultaneously acquired nadir-looking imagery and laser-altimetry validates this method. The ability to assess all of these parameters with an ice penetrating radar expands the demonstrated capability of a principle instrument in icy planet satellite science to include statistical reconnaissance of the surface roughness to identify suitable sites for a follow-on lander mission. (C) 2014 The Authors. Published by Elsevier Ltd.
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