Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.u41c0830t&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #U41C-0830
Astronomy and Astrophysics
Astronomy
5422 Ices, 5464 Remote Sensing, 5494 Instruments And Techniques, 6250 Moon (1221), 6949 Radar Astronomy
Scientific paper
For lunar orbital synthetic aperture radars, such as the Chandrayaan Mini-RF operating at S-Band (13cm) wavelength and the Lunar Reconnaissance Orbiter Mini-RF operating at S-Band and X-Band (3-cm) wavelengths, it is important to understand and model the radar backscattering characteristics of the lunar surface. Lunar radar backscatter cross-section for the average surface was estimated from the lunar radar backscatter cross-sections at 3.8, 23, and 68-cm wavelength measured in the 1960's by MIT (Hagfors, 1970). In particular, an estimate for backscatter at 13 cm wavelength was generated by a weighted geometric mean of 3.8 and 23 cm data. This estimate in turn was modeled by a relatively simple function with components for low-angle quasi-specular scattering from flat-plates perpendicular to radar line-of- sight and high-angle diffuse scattering from wavelength-sized roughness elements (Evans and Hagfors, 1964). Our scattering model also provides a means for estimating scattering differences associated with slopes, surface roughness and patches of ices. Scattering differences associated with different slopes is modeled by simply computing the expected scattering for level and tilted terrains. Scattering differences associated with different roughnesses, which can be associated with enhanced diffuse scatters (wavelength-sized rocks and blocks located on the surface or buried in the near subsurface) is estimated from a 2-component model that assumes appropriate variation of quasi-specular and diffuse scattering. Scattering differences associated with patches or pockets of ice is estimated using a similar 2-component model assuming appropriate variations of the quasi-specular and diffuse elements. References: J.V. Evans and T. Hagfors (1964), On the interpretation of radar reflections from the Moon, Icarus, v.3, pp. 151 - 160. T. Hagfors (1970), Remote probing of the Moon by infrared and microwave emissions and by radar, Radio Science, v.5, pp. 189 - 227.
Thompson William T.
Ustinov Eugene A.
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