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• W2225571431 abstract "Planetary radar can be considered humankind’s strongest instrument for postdiscovery characterization and orbital refinement of near-Earth objects. After decades of radar observations, extensive literature describing the radar properties of various objects of the Solar System is currently available. Simultaneously, there is a shortage of work on what the observations imply about the physical properties of the planetary surfaces. The goal of my thesis is to fill part of this gap. Radar scattering as a term refers to alterations experienced by electromagnetic radiation in the backscattering direction when interacting with a target particle. In the thesis, I investigate by numerical modeling what role different physical properties of planetary surfaces, such as the electric permittivity, size of scatterers, or their number density, play in radar scattering. In addition, I discuss how radar observations can be interpreted based on modeling. Because all codes have their own limitations, it is crucial to compare results obtained with different methods. I use Multiple Sphere T -matrix method (MSTM) for clusters of spherical particles to understand scattering by closely-packed regolith particles. I use the discrete-dipole approximation code ADDA to comprehend singlescattering properties of inhomogeneous or irregular regolith particles in wavelengthscale. And finally, I use a ray-optics algorithm with radiative transfer, SIRIS, to simulate radar scattering by large irregular particles that mimic planetary bodies. The simulations for clusters of spherical particles reveal polarization enhancement at certain bands of sizes and refractive indices in the backscattering direction. The results from computations using MSTM and ADDA imply that the electric permittivity plays a strong part in terms of circular polarization. From the results of ray-optics computations for large, irregular particles, I derive a novel semi-analytic form for the radar scattering laws. And, by including diffuse scattering using wavelength-scale particles with laboratory-characterized geometries, we are able to simulate the effect of numerous physical properties of a realistic planetary surface on radar scattering. Our model using SIRIS is among the most quantitative models for radar scat-" @default.
• W2225571431 created "2016-06-24" @default.
• W2225571431 creator A5079468606 @default.
• W2225571431 date "2016-01-08" @default.
• W2225571431 modified "2023-09-26" @default.
• W2225571431 title "Planetary surface characterization by modeling radar scattering" @default.
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• W2225571431 hasPublicationYear "2016" @default.
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