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Proceedings of the IEEE

Issue 3 • March 1986

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Publication Year: 1986, Page(s): c1
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  • Scanning the issue

    Publication Year: 1986, Page(s):387 - 388
    Cited by:  Papers (1)  |  Patents (2)
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  • Comparison of some inverse methods for wave propagation in layered media

    Publication Year: 1986, Page(s):389 - 400
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    The one-dimensional wave equation in a layered medium is considered. The inverse problem consists of computing the acoustic impedance of the layered medium from the reflection response measured at the surface. For a discrete medium consisting of homogeneous layers of equal traveltime the Levinson algorithm is used to compute the reflection coefficients at the interfaces between the layers. For a m... View full abstract»

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  • One-dimensional normal-incidence inversion: A solution procedure for band-limited and noisy data

    Publication Year: 1986, Page(s):401 - 414
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1175 KB)

    In this paper we present a one-dimensional normal-incidence inversion procedure for reflection seismic data. A lossless layered system is considered which is characterized by reflection coefficients and traveltimes. A priori knowledge for the unknown parameters, in the form of statistics, is incorporated into a nonuniform layered system, and a maximum a posteriori estimation procedure is used for ... View full abstract»

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  • Seismic inversion in terms of pre-stack migration and multiple elimination

    Publication Year: 1986, Page(s):415 - 427
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (909 KB)

    A discussion is given on multidimensional seismic inversion techniques. It is argued that seismic inversion techniques should be subdivided in two categories: 1) inversion for the macro parameters of the subsurface, 2) inversion for the detail in the subsurface, both categories requiring a significantly different approach. Ample attention is paid to the different inversion techniques in multi-expe... View full abstract»

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  • Migration of seismic data by the WKBJ method

    Publication Year: 1986, Page(s):428 - 439
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    Migration is a term used in reflection seismology to describe the process of moving the recorded reflection events to their correct spatial positions by backward projection or depropagation. Although seismic records have been migrated since the very first reflection survey in 1921 in Oklahoma, it was the paper by Loewenthal, Lu, Robertson, and Sherwood [1] in 1976 that introduced the exploding-ref... View full abstract»

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  • Imaging and inversion of zero-offset seismic data

    Publication Year: 1986, Page(s):440 - 456
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2850 KB)

    We present some of the basic problems of seismic inverse theory and some of the basic principles used in solving them. The one-dimensional (1-D) acoustic inverse problem is treated as an introduction to the more important and difficult three-dimensional (3-D) imaging and inverse problems. We argue that certain aspects of seismic data (e.g., CMP stacking and band- and aperture-limiting) are suffici... View full abstract»

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  • Pre-stack reverse-time migration for elastic waves with application to synthetic offset vertical seismic profiles

    Publication Year: 1986, Page(s):457 - 465
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2553 KB)

    A pre-stack migration algorithm for elastic waves in two-dimensional variable-velocity media is developed, implemented, and tested. The algorithm operates in the time-space domain and is based on reverse-time finite-difference extrapolation of elastic waves. The algorithm is explained and demonstrated in the context of imaging of elastic vertical seismic profile data, but is applicable to any sour... View full abstract»

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  • Multidimensional born inversion with a wide-band plane-wave source

    Publication Year: 1986, Page(s):466 - 475
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (937 KB)

    The inverse scattering problem for an acoustic medium is considered within the homogeneous background Born approximation. A constant-density acoustic medium is probed by a wide-band plane-wave source. The scattered field is observed along a receiver array located outside the medium. Two methods for partial reconstruction of the medium velocities are presented. In the first method (the slant-stack ... View full abstract»

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  • An application of Marquardt's procedure to the seismic inverse problem

    Publication Year: 1986, Page(s):476 - 486
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (887 KB)

    The seismic inverse problem is to infer characteristics of the subsurface from measurements of the wave field at the surface. The Marquardt procedure offers one approach to this problem. In applying this procedure, a linear relationship is developed between the wave field and some parameter which describes a physical property of the subsurface. Then a selection criterion is designed to choose the ... View full abstract»

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  • Inversion of band-limited reflection seismograms: Theory and practice

    Publication Year: 1986, Page(s):487 - 497
    Cited by:  Papers (4)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5481 KB)

    This paper examines the problem of recovering the acoustic impedance from band-limited normal incidence reflection seismograms. Recognizing the inherent nonuniqueness in the inversion, we proceed by constructing an impedance model which satisfies the processed seismogram, has a minimum of structural variation, honors any point impedance constraints that are provided, and incorporates information f... View full abstract»

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  • Pre-stack inversion of a 1-D medium

    Publication Year: 1986, Page(s):498 - 508
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (901 KB)

    Assuming a one-dimensional (1-D) acoustic medium and a known density, we want to determine the velocity distribution from pre-stack surface seismic data. Basically, we have to identify a distributed parameter in the two-dimensional (2-D) wave equation. This inverse problem is set as an optimization problem. This allows us to expect that the information redundancy available in the data will provide... View full abstract»

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  • On the state equations of nonlinear networks and the uniqueness of their solutions

    Publication Year: 1986, Page(s):513 - 514
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (214 KB)

    Concerning the equilibrium points and the uniqueness of solutions, some wrong results have appeared recently about the state description of nonlinear networks; in contrast to those results in [1], it is shown through the same example that every critical (or singular) point where the state derivative vanishes is not an equilibrium point, and the state description in terms of the capacitor voltage l... View full abstract»

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  • Comments on "Sources of failures and yield improvement for VLSI and restructurable interconnects for RVLSI and WSI: Part I—Sources of failures and yield improvement for VLSI"

    Publication Year: 1986, Page(s):515 - 516
    Cited by:  Papers (2)
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  • Some important properties of synchronous oscillators

    Publication Year: 1986, Page(s):516 - 518
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1643 KB)

    A Synchronous Oscillator (SO) tracks, filters, divides, and amplifies the input carrier in a single process. Narrow-resolution bandwidth, high input-signal sensitivity, and fast acquisition are the most important properties of the SO, while the resolution bandwidth remains as its most unique functional behavior. View full abstract»

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  • Adaptive invariant novelty filters

    Publication Year: 1986, Page(s):518 - 519
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The multiple-channel novelty filters of associative memory are derived from the retina neuron network point-spread function. Scale and rotation invariance is achieved by the input data flowing through the nonuniform polar exponential sampling to a uniform output space. Image domain bandpassing techniques are then used to extract the low-band and high-band frequency contents of the equivalent novel... View full abstract»

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  • A Hilbert transform product theorem

    Publication Year: 1986, Page(s):520 - 521
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (187 KB)

    The usual product theorem for Hilbert transforms states that under certain conditions x(t)y(t), the Hilbert transform of a product of two signals x(t) and y(t), is equal to x(t)y^(t), a result having repeated use in simplifying calculations involving modulated waveforms. Several sufficient conditions for the theorem to hold are well-known and appear in the literature. Here, using a time... View full abstract»

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  • Covariance and power spectrum of a sinusoidal carrier, angel modulated by a uniformly distributed random process

    Publication Year: 1986, Page(s):522 - 523
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The covariance and power spectrum of a sinusoidal carrier, angle modulated by a zero mean random signal having a rectangular probability density is studied. Numerical calculations have been carried out when the modulating noisy signal has been shaped by an RC filter. View full abstract»

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  • Spectral estimation by repetitive L1-norm minimization

    Publication Year: 1986, Page(s):523 - 524
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (177 KB)

    The use of the simplex for spectral estimation of noisy harmonic processes is very effective when the number of sinusoids is known and is taken into account. In the present letter a method is proposed for determining this number by properly extending the method of simplex estimation. View full abstract»

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  • Developments in expert systems

    Publication Year: 1986, Page(s):525 - 526
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  • Design of testable logic circuits

    Publication Year: 1986, Page(s): 525
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  • Book alert

    Publication Year: 1986, Page(s):526 - 527
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  • [Back cover]

    Publication Year: 1986, Page(s): c4
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Editor-in-Chief
H. Joel Trussell
North Carolina State University