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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 67 for “"inverse scattering"”.
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Toward Practical Inverse Scattering
… the nature of superresolution in nonlinear inverse scattering is studied. The prospect of subwavelength resolution at optically large observation distances is investigated. A perfectly conducting tip is used to enhance reconstruction resolution. Thus, two conjectures as to how …
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Approximate inverse scattering using pseudodifferential scaling
… efficient method for approximating the inverse of the normal operator arising in the linearized inverse problem for reflection seismology. The inversion of the normal operator using direct matrix methods is computationally infeasible. Approximate inverses estimate the solution of the …
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Analog modeling study of inverse scattering
Includes bibliographical references (pages 56-59).
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The Two-Dimensional Inverse Scattering Problem
Made available in DSpace on 2015-05-12T21:43:53Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7000880.PDF: 1782345 bytes, checksum: 339349fcde22988e0d1adbbebba4d80c (MD5) Previous issue date: 1969
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The one-dimensional inverse scattering problem.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1966. Ph.D.
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Nonlinear Acoustics and an Inverse Scattering Problem
Abstract This Ph.D is concerned with wave propagation problems. The main focus is on nonlinear acoustics, looking at sonic boom propagation in a physically realistic atmosphere, whilst a secondary part will look at the problem of landmine detection and how to improve the target detection rates. The …
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Electromagnetic Inverse Scattering Problems for Strong Scatterers
The application of electromagnetic waves to inverse scattering problems can provide information about a distant object or allow an object to be analyzed without using invasive procedures. This dissertation develops two-dimensional theories for solving the inverse scattering problem of strong …
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Broadband microwave inverse scattering: Theory and experiment
… methods for performing broadband time-domain inverse scattering. The inverse scattering problem is very important for a number of application areas including nondestructive evaluation, geophysical probing, medical imaging and military target identification. Emphasis is placed on the use of …
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Inverse Scattering Image Quality with Noisy Forward Data
Image quality metrics for several inverse scattering methods and algorithms are presented. Analytical estimates and numerical simulations provide a basis for poor image quality diagnostics. The limitations and noise behavior of reconstructed images are explored analytically and empirically using a …
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Forward and inverse scattering problems in the time domain
… 2}$-dimensional electromagnetic forward scattering problem in the time domain is developed, which circumvents the use of three-dimensional arrays to solve the vector wave problem. The method is based on calculating the three-dimensional fields as a summation of Fourier-transformed …
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Theory and applications of scattering and inverse scattering problems
… discretizing the object into N subobjects, the scattering solution of an arbitrarily shaped inhomogeneous scatterer can be formulated as a scattering solution of an N-scatterer problem, each of whose scattered fields is approximated by M harmonics. Using the translation formulas, a recursive …
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On The Use Of Variable Coherence In Inverse Scattering Problems
… coherence tomography, a growing number of scattering techniques have relied on temporal coherence gating which provides efficient target selectivity in a way achieved only by bulky short pulse measurements. The spatial counterpart of temporal coherence, however, has barely been exploited in …
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Refining the amplitude of inverse scattering series internal multiple predictions
… to attenuate internal multiples uses the inverse scattering series. Two key improvements with the method are developed. First, a new tool is established referred to as the downward generator space. This space used in combination with higher order terms and 2D adaptive subtraction improves …
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A study of iterative methods on forward and inverse scattering problems
… in the electromagnetic and acoustic wave scattering. Both the conjugate gradient and bi-conjugate gradient methods combined with the fast Fourier transform (CGFFT and BiCGFFT) are employed as efficient solvers in forward and inverse scattering problems for penetrable bodies.
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Scattering and inverse-scattering problems in a continuously varying elastic medium.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1969.
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Direct and inverse scattering models for random media and rough sufraces
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Global Maxwell Tomography : inverse scattering via magnetic resonance and volume integral equations
… of Global Maxwell Tomography, a global inverse scattering algorithm. This algorithm is based on Volume Integral Equation formulations and operates on Magnetic Resonance data. The algorithm is framed as an optimization problem with box constraints, whereby guesses of material properties …
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Integral Equation-Based Inverse Scattering and Coil Optimization in Magnetic Resonance Imaging
… tasks of 3D electrical properties estimation (inverse scattering) and parallel transmit (pTx) coil array optimization. I also present novel regularization strategies that are ideally suited for inverse problems. I also discuss how we validated these approaches with numerical examples, and the …
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Electromagnetic Time-Reversal Imaging and Tracking Techniques for Inverse Scattering and Wireless Communications
… of time-reversed back propagation in rich scattering environments beats that in free space, yielding what is known as `superresolution’. Moreover, under ultrawideband (UWB) operation, TR exhibits the distinctive property of `statistical stability’, which makes it an attractive technique for …
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