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Studies on the Effects of Rough Surfaces on Electromagnetic Scattering

Raines, Ethan
http://rave.ohiolink.edu/etdc/view?acc_num=osu1689772121631981

Abstract Details

2023, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Rough surface scattering is an essential aspect of modern remote sensing research, as virtually all real-world surfaces exhibit some degree of roughness whose effects cannot be adequately accounted for using simple planar surfaces. However, knowledge of what each rough surface model is capable of is critical, as choosing an appropriate model will aid in providing accurate results while minimizing the computational cost incurred. To explore these capabilities, four studies were conducted to assess how various rough surface scattering models fare in scenarios of current interest to the remote sensing community. The first two studies involve the Kirchhoff approximation (KA), with the first study assessing its applicability when the normalized coherent reflected field (which the KA is commonly used to model) is -20dB or lower, and the second study comparing it to a second-order correction term based on the second-order small slope approximation (SSA2) for ocean surface scattering. The first study shows that the KA continues to be applicable for such low amplitude cases, and the second study shows that the second-order correction shows no marked improvement over the base KA overall. The third study uses the SSA2 to validate retrieved zero-Doppler delay waveforms as part of a campaign to explore off-specular ocean scattering, and found the model waveforms to match the retrieved waveforms well in most cases considered. The fourth and final study uses simulated SAR imagery to determine under what conditions a monostatic radar system will observe the same surface scattering as a bistatic radar system, and revealed that cases with near-normal incidence angles and minor roughness yield the best agreement, with effects such as shadowing and multiple reflections accounting for most of the disagreements.
Joel Johnson (Advisor)
Fernando Teixeira (Committee Member)
Robert Burkholder (Committee Member)
130 p.
Electrical Engineering; Electromagnetics; Physics; Remote Sensing
electromagnetics; remote sensing; rough surface; rough surface scattering; Kirchhoff model; Kirchhoff approximation; physical optics; bistatic radar; bistatic scattering; synthetic aperture radar; SAR

Recommended Citations

Citations

  • Raines, E. (2023). Studies on the Effects of Rough Surfaces on Electromagnetic Scattering [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1689772121631981

    APA Style (7th edition)

  • Raines, Ethan. Studies on the Effects of Rough Surfaces on Electromagnetic Scattering. 2023. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1689772121631981.

    MLA Style (8th edition)

  • Raines, Ethan. "Studies on the Effects of Rough Surfaces on Electromagnetic Scattering." Doctoral dissertation, Ohio State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=osu1689772121631981

    Chicago Manual of Style (17th edition)

osu1689772121631981
49
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This open access ETD is published by The Ohio State University and OhioLINK.