Inference of Block Populations from Radar Backscatter: Application to Pathfinder Landing Site Characterization

Details Inference of Block Populations from Radar Backscatter: Application to Pathfinder Landing Site Characterization Inference of Block Populations from Radar Backscatter: Application to Pathfinder Landing Site Characterization

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1205s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1205

Computer Science

Mars Pathfinder, Radar, Scattering

Scientific paper

Historically, roughness estimates for planetary surfaces on scales of centimeters to meters have been derived from dispersion of quasi-specular radar echoes.Echo broadening in time and/or frequency can be related to distribution of tilts of surface facets properly oriented to give mirror-like reflection toward the radar receiver.It has long been recognized that this model is incomplete; in most cases the effects from discrete scattering objects (e.g., rocks) will be missed, while in the worst circumstances, such as on aa basalt flows where the concept of a "facet" has little meaning, the model is hopelessly inadequate.Mie theory allows calculation of scattering from individual spherical particles in a homogeneous dielectric medium; approximations allow extension to ellipsoids.But the general problem of scattering from irregular objects near the top of a dielectric half-space (regolith) has remained intractable.Starting from first principles, however, we have succeeded in developing finite-difference time-domain (FD-TD) codes which accurately represent the scattering process in 2- and 3-dimensions and have been able to relate the numerical results to simple populations of blocks which might be found on surfaces such as near the Viking Lander sites and at the proposed Mars Pathfinder site.

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