IEEE Transactions on Antennas and Propagation

Issue 2 • March 1981

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Displaying Results 1 - 25 of 43
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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  • Opening remarks

    Publication Year: 1981, Page(s):190 - 191
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  • The applicability of an inverse method for reconstruction of electron-density profiles

    Publication Year: 1981, Page(s):245 - 252
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (730 KB)

    Inverse scattering theory is used to reconstruct profiles of electron density from the analytic representation of the reflection coefficient. The complex reflection coefficientr(k)is represented as a rational function of the wavenumberk. Using a three-pole approximation forr(k), the one-dimensional inverse scattering theory is applied to obtain a closed-form expres... View full abstract»

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  • Polarization dependence in electromagnetic inverse problems

    Publication Year: 1981, Page(s):262 - 271
    Cited by:  Papers (80)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (877 KB)

    The complete description of electromagnetic scattering processes implies polarization since an electromagnetic scatterer acts like a polarization transformer. The main objective is to show that due to the vector nature of electromagnetic waves, electromagnetic remote sensing and inverse scattering techniques, if applied rigorously, require incorporation of polarization information into their formu... View full abstract»

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  • Solution of underdetermined electromagnetic and seismic problems by the maximum entropy method

    Publication Year: 1981, Page(s):271 - 274
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (356 KB)

    Many inversion problems require solution of a Fredholm integral equation of the formT(bar{r}) = int D(bar{r},bar{r}')sigma (bar{r}') dV', whereTis the observable,Dis an operator, andsigmais the unknown parameter distribution. Examples occur in the areas of radiation and scattering, tomography, and geotomography. We reduce the equation to matrix form and ... View full abstract»

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  • Remote sensing of path-averaged raindrop size distributions from microwave scattering measurements

    Publication Year: 1981, Page(s):275 - 281
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (552 KB)

    A multichannel microwave propagation experimental system whose frequencies are 1.7 GHz, 11.5 GHz, 34.5 GHz, and 81.8 GHz is introduced in order to measure not only attenuation and phase shift due to rain, but also to infer a path-averaged raindrop size distributionoverline{N(D)}from the measurements, in addition to 11.5 GHz, 34.5 GHz, and 81.8 GHz copolar attenuation, phase variations b... View full abstract»

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  • Determination of the parameters of a dipole by measurement of its magnetic field

    Publication Year: 1981, Page(s):282 - 287
    Cited by:  Papers (38)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    A novel method to determine the parameters (dipole moment, orientation, and location) of a magnetic dipole is discussed. The method, which requires no a priori knowledge of the parameters, consists of measuring one or more components of the magnetic field of the dipole in a two-dimensional grid and performing a two-dimensional multiparameter nonlinear least squares fit to the data. Results of comp... View full abstract»

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  • Physical optics imaging with limited aperture data

    Publication Year: 1981, Page(s):332 - 335
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (275 KB)

    Some results are reported of an applied research effort concerning the imaging and/or identification of conducting cones based on measured transient response data. An important restriction on the effort was that data were available at only a few look angles, all withinpm30degof nose-on incidence. The accuracy between measured data set and physical optics inverse scattering results is fi... View full abstract»

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  • Target classification with multiple frequency illumination

    Publication Year: 1981, Page(s):352 - 358
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (581 KB)

    Target classification may be viewed as a crude form of inverse scattering that determines which ofMprespecified body shapes is most consistent with the scattered field data. A method is described for discriminating between different target shapes by appropriately processing the backscattered waveforms or target signature observed in radar receivers. Although this general subject has rec... View full abstract»

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  • Stability problems in inverse diffraction

    Publication Year: 1981, Page(s):368 - 372
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (465 KB)

    Inverse diffraction consists in determining the field distribution on a boundary surface from the knowledge of the distribution on a surface situated within the domain where the wave propagates. This problem is a good example for illustrating the use of least-squares methods (also called regularization methods) for solving linear ill-posed inverse problems. We focus on obtaining error bounds for r... View full abstract»

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  • Some mathematical considerations in dealing with the inverse problem

    Publication Year: 1981, Page(s):373 - 379
    Cited by:  Papers (75)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (626 KB)

    Many problems of mathematical physics can be formulated in terms of the operator equationAx = y, whereAis an integro-differential operator. GivenAandx, the solution foryis usually straightforward. However, the inverse problem which consists of the solution forxwhen givenAandyis much more difficult. The followin... View full abstract»

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  • The phase retrieval problem

    Publication Year: 1981, Page(s):386 - 391
    Cited by:  Papers (61)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (731 KB)

    The phase retrieval problem arises in applications of electromagnetic theory in which wave phase is apparently lost or impractical to measure and only intensity data are available. The mathematics of the problem provides unusual insights into the nature of electromagnetic fields. The theory is reviewed and illustrated. The basic issue of the phase retrieval problem, stated for a one-dimensional fi... View full abstract»

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  • Estimation of the volume and the size of a scatterer from band-limited time domain signature

    Publication Year: 1981, Page(s):398 - 399
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (214 KB)

    An inverse scattering model, based on the time domain concepts of electromagnetic theory, is developed using the first five (zeroth to fourth) moment condition integrals to recover the Rayleigh coefficient and the next higher order nonzero coefficient of the power series expansion ink(wavenumber) of the target backscattering response. The Rayleigh coefficient and the other coefficient t... View full abstract»

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  • Encoding of information in inverse scattering problems

    Publication Year: 1981, Page(s):406 - 408
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (347 KB)

    The use of functions of classEfor encoding information in inverse scattering-and in general inverse optical-problems is outlined. The way in which zeros describe all the information about band-limited functions is presented. Subsequently, the advantages of utilizing this description are considered. View full abstract»

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  • Polarization dependence of RCS--A geometrical interpretation

    Publication Year: 1981, Page(s):412 - 413
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    The variation of back-scattered radar cross section (RCS) with common transmit-receive polarizationPis given by a simple geometrical construction on the Poincare sphere. View full abstract»

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  • [Back cover]

    Publication Year: 1981, Page(s): c4
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    Freely Available from IEEE
  • Iterative determination of permittivity and conductivity profiles of a dielectric slab in the time domain

    Publication Year: 1981, Page(s):239 - 245
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    A numerical method is presented to compute one unknown constitutive parameter of an inhomogeoeous lossy dielectric slab from the reflected field in the time domain. The method is based upon a space-time discretization of the integral equation for the reflected field. In the inversion, especially those space-time points where the numerical computation of the electric-field strength in the slab is m... View full abstract»

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  • Operator-theoretic and computational approaches to Ill-posed problems with applications to antenna theory

    Publication Year: 1981, Page(s):220 - 231
    Cited by:  Papers (85)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1360 KB)

    A general framework for regularization and approximation methods for ill-posed problems is developed. Three levels in the resolution processes are distinguished and emphasized: philosophy of resolution, regularization-approximation schema, and regularization algorithms. Dilemmas and methodologies of resolution of ill-posed problems and their numerical implementations are examined in this framework... View full abstract»

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  • On computation of electromagnetic fields on planar surfaces from fields specified on nearby surfaces

    Publication Year: 1981, Page(s):402 - 404
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (248 KB)

    A technique is presented for solution of the inverse problem of calculating the electric field on a planar surface from the electric field specified on a nearby surface. An integral equation is derived that relates two orthogonal components of the electric field on the nearby surface to the respective components of the plane wave spectrum of the planar electric field. The integral equation is solv... View full abstract»

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  • Frequency swept tomographic imaging of three-dimensional perfectly conducting objects

    Publication Year: 1981, Page(s):312 - 319
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (768 KB)

    The use of frequency swept or frequency diversity techniques to achieve, superresolution in the imaging of three-dimensional perfectly conducting objects is studied and demonstrated by computer simulations. The frequency swept imaging concept is found to be a generalization of the inverse scattering theory. By invoking Fourier domain projection theorems, it is demonstrated analytically that images... View full abstract»

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  • Synthetic imaging from coherent backscattering

    Publication Year: 1981, Page(s):380 - 385
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (608 KB)

    Scattered fields from radar targets can be processed to construct target images. An analytical simulation of coherent backscattering and synthetic imaging is reviewed. Conducting objects with an axial symmetry are used as examples to demonstrate the results of analytical backscattering and synthesis procedure. An interrogating radar waveform is simulated using the Hamming weighting function. The p... View full abstract»

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  • Improved resolution in microwave holographic images

    Publication Year: 1981, Page(s):320 - 326
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (592 KB)

    Microwave holography is a useful experimental technique for imaging remote or inaccessible objects and for diagnostics of antennas, radomes, and scatterers; however, diffraction restricts image resolution. A method is described for improving resolution in microwave holography. The holograms are spherical or circular. Porter's scalar theory of curved holograms is extended to vector fields by using ... View full abstract»

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  • Time domain inverse scattering

    Publication Year: 1981, Page(s):213 - 219
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (640 KB)

    The inverse scattering problem is addressed directly in the time domain using an exact space-time integral equation as the basis for solution. A time domain approach to the solution is presented and demonstrated for the case of conducting rotationally symmetric targets with both axial incidence and broadside incidence. Both an iterative and a direct solution technique are illustrated and compared. View full abstract»

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  • Improved performance of a subsurface radar target identification system through antenna design

    Publication Year: 1981, Page(s):307 - 311
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (560 KB)

    Improved identification performance of a video pulse subsurface radar system is reported. The video pulse system, which utilizes complex natural resonances of the target and a prediction correlation processing, is improved in comparison to the system reported previously by better fitting the system bandwidth to the bandwidth which contains the complex natural resonances of the desired target. The ... View full abstract»

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  • The K-pulse concept

    Publication Year: 1981, Page(s):327 - 331
    Cited by:  Papers (89)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (488 KB)

    Two general classes of inversion techniques may be distinguished: those utilizing angular or spatial frequency analysis over as wide a range of target aspects as practicable, and those involving relatively few aspects but employing as wide a frequency spectrum as possible. The latter technique is discussed, and a special excitation waveform called the "kill-pulse" or K-pulse is proposed. By analog... View full abstract»

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IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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Editor-in-Chief                                             Danilo Erricolo