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Sökning: WFRF:(Beilina A)

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  • Kuzhuget, A. V., et al. (författare)
  • Blind backscattering experimental data collected in the field and an approximately globally convergent inverse algorithm
  • 2012
  • Ingår i: Inverse Problems. - : IOP Publishing. - 0266-5611 .- 1361-6420. ; 28:9
  • Tidskriftsartikel (refereegranskat)abstract
    • An approximately globally convergent numerical method for a 1D coefficient inverse problem for a hyperbolic PDE is applied to image dielectric constants of targets from blind experimental data. The data were collected in the field by the Forward Looking Radar of the US Army Research Laboratory. A posteriori analysis has revealed that computed and tabulated values of dielectric constants are in good agreement. Convergence analysis is presented.
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  • Kuzhuget, A. V., et al. (författare)
  • Quantitative image recovery from measured blind backscattered data using a globally convergent inverse method
  • 2013
  • Ingår i: IEEE Transactions on Geoscience and Remote Sensing. - 0196-2892 .- 1558-0644. ; 51:5, s. 2937 - 2948
  • Tidskriftsartikel (refereegranskat)abstract
    • The goal of this paper is to introduce the application of a globally convergent inverse scattering algorithm to estimate dielectric constants of targets using time-resolved backscattering data collected by a U.S. Army Research Laboratory forward-looking radar. The processing of the data was conducted blind, i.e., without any prior knowledge of the targets. The problem is solved by formulating the scattering problem as a coefficient inverse problem for a hyperbolic partial differential equation. The main new feature of this algorithm is its rigorously established global convergence property. Calculated values of dielectric constants are in a good agreement with material properties, which were revealed a posteriori.
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  • Karchevskii, E. M., 1970, et al. (författare)
  • Reconstruction of Dielectric Constants of Core and Cladding of Optical Fibers Using Propagation Constants Measurements
  • 2014
  • Ingår i: Physics Research International. - : Hindawi Limited. - 2090-2220 .- 2090-2239 .- 1687-689X. ; 2014
  • Tidskriftsartikel (refereegranskat)abstract
    • We present new numerical methods for the solution of inverse spectral problem to determine the dielectric constants of core and cladding in optical fibers. These methods use measurements of propagation constants. Our algorithms are based on approximate solution of a nonlinear nonselfadjoint eigenvalue problem for a system of weakly singular integral equations. We study three inverse problems and prove that they are well posed. Our numerical results indicate good accuracy of new algorithms.
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  • Resultat 1-10 av 27

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