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Proceedings of the IEEE

Issue 7 • July 1979

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1979, Page(s):979 - 980
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  • Pulse propagation in lossy media using the low-frequency window for video pulse radar application

    Publication Year: 1979, Page(s):981 - 990
    Cited by:  Papers (20)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1057 KB)

    Pulse propagation in lossy media is considered. The frequency band is selected to lie in the low-frequency window (LFW) as defined by Gabbilard et al [5]. The antennas chosen are finite-length dipoles in electrical contact with the lossy media. The input impedance of these dipoles is observed to be approximately a constant resistance over the wide frequency band of interest thus making a broad-ban... View full abstract»

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  • A characterization of subsurface radar targets

    Publication Year: 1979, Page(s):991 - 1000
    Cited by:  Papers (28)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    The capability of subsurface target identification at shallow depths has been demonstrated using an electromagnetic video or base-band pulse radar. Real radar measurements were collected for five targets at a depth of 5 cm (2 in) in various ground conditions. These measurements were processed for target characterization and identification. Identification performance based on a single radar observa... View full abstract»

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  • Summary of image theory expressions for the quasi-static fields of antennas at or above the earth's surface

    Publication Year: 1979, Page(s):1001 - 1008
    Cited by:  Papers (56)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (599 KB)

    Expressions for the quasi-static range (the measurement distance is much less than a free-space wavelength) field components produced by infinitesimal dipole antennas located at or above that of the earth have been derived by employing finitely conducting earth theory techniques. Formulas for the field components produced by an elevated, finite-length, horizontal electric antenna are also presente... View full abstract»

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  • Numerical modeling for electromagnetic remote sensing of inhomogeneities in the ground

    Publication Year: 1979, Page(s):1009 - 1015
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (657 KB)

    After a brief description of the mathematical formulation, we show some of the benefits that can be derived from numerical models. One of these benefits is to furnish an estimation of the suitability of electromagnetic prospecting methods with regard to specific sounding tasks. Using as an example the detection of a magma pocket with a line-source of current or an electric antenna as excitation, w... View full abstract»

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  • Transient electromagnetic waves applied to prospecting

    Publication Year: 1979, Page(s):1016 - 1021
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (706 KB)

    An argument based on a high-frequency filter can be used to show that the later stages of a transient are strongly controlled by the low-frequency component of its spectrum. In particular for a sphere of radius 50 m and conductivity 2 mho/m, frequencies greater than 3100 Hz are unimportant for times greater then 3 ms. For the later stages of the transient, where only low frequencies are important,... View full abstract»

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  • Transient electromagnetic fields of a vertical magnetic dipole on a two-layer earth

    Publication Year: 1979, Page(s):1022 - 1029
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (639 KB)

    The transient fields of a vertical magnetic dipole on a two-layer earth model are expressed in analytical form using two different approaches. In the first, the fields in the time domain are obtained as the inverse Laplace transforms of derived full wave time-harmonic solutions, while in the second, the concept of natural frequencies of the stratified earth is utilized. Comparison with a previousl... View full abstract»

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  • Geomagnetic depth sounding by means of oceanographic and aeromagnetic surveys

    Publication Year: 1979, Page(s):1029 - 1034
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (986 KB)

    The investigation of underground conductivity structures by means of geomagnetic data (i.e., geomagnetic depth sounding (GDS)) has been extensively carried out over land areas using three component recordings. However, the large amount of data collected for many years by airborne and/or shipborne magnetometry all over the world have generally been used to infer only static magnetic anomalies. The ... View full abstract»

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  • The fundamental model of magnetotelluric sounding

    Publication Year: 1979, Page(s):1034 - 1044
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (835 KB)

    It is widely believed that the Tikhonov-Cagniard model can be applied in the magnetotelluric method of exploration geophysics if the horizontal field changes are sufficiently slow. Actually, this is overly restrictive and may give rise to unjustified doubts about the validity of the Tikhonov-Cagniard model. This paper shows that the condition determining the applicability of the model is the linea... View full abstract»

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  • Electromagnetic induction in thin sheet conductivity anomalies at the surface of the earth

    Publication Year: 1979, Page(s):1044 - 1050
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    Lateral variations in the Earth's conductivity complicate considerably the calculation of the electromagnetic response of the Earth to an external inducing field which is uniform and horizontal. Although analytic solutions have been found for a few simple two-dimensional models in which the conductivity varies in one horizontal direction only, it is necessary, in general, to resort to numerical me... View full abstract»

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  • Electromagnetic induction effects at an ocean coast

    Publication Year: 1979, Page(s):1050 - 1060
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1042 KB)

    This paper reviews recent progress in model calculations towards understanding electromagnetic induction effects at ocean coasts. Early models consisted of two adjacent quarter-spaces of different conductivity, whereas the newer models simulate the ocean with a very thin sheet of a perfect conductor placed on top of a uniform Earth medium. The inducing field is assumed to arise from a monochromati... View full abstract»

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  • Reconstruction algorithms for geophysical applications in noisy environments

    Publication Year: 1979, Page(s):1060 - 1064
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (431 KB)

    Remote determination of underground geophysical structures is a matter of considerable interest. Detecting such structures by scanning the area of interest with electromagnetic radiation is shown to reduce to the problem of solving an inconsistent system of equations for a spatial attenuation distribution. This paper examines the employment of reconstruction algorithms to solve such systems of equ... View full abstract»

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  • Computerized geophysical tomography

    Publication Year: 1979, Page(s):1065 - 1073
    Cited by:  Papers (293)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1103 KB)

    Computerized tomography is used as an aid in geophysical exploration. With this method, detailed pictures of electromagnetic properties in the regions between pairs of boreholes can be reconstructed. The spatial distribution of attenuation or propagation velocity is calculated from line integrals along rays in the plane between boreholes, and displayed as a digital picture. In principle, the trans... View full abstract»

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  • An alternate direct form realization of FIR filters and its noise analysis

    Publication Year: 1979, Page(s):1077 - 1078
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    An alternate realization of direct form FIR filters is presented, and its coefficient sensitivity and roundoff noise are evaluated and compared with those of the usual direct form. View full abstract»

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  • A new active-R nonideal series resonator and its application in a low-pass filter realization

    Publication Year: 1979, Page(s):1078 - 1080
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB)

    A new configuration using only two operational amplifiers and a single resistor that simulates a series LC-type resonator is presented. The resonator realized is nonideal in that the driving point impedance simulates on one-port which is a combination of an ideal series LC resonator and a shunt resistor. Suitable insertion of three more resistors enables the resonator to be tuned independently for... View full abstract»

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  • Novel active-R ideal frequency-dependent negative-resistance simulation

    Publication Year: 1979, Page(s): 1080
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (121 KB)

    A novel structure for the simulation of an ideal frequency-dependent negative-resistance (FDNR) element based on the single-pole rolloff characteristics of the operational amplifier is reported. The structure uses only operational amplifiers and a resistor. View full abstract»

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  • New grounded-capacitor realizations of a third-order low-pass butterworth characteristic using the DVCCS/DVCVS

    Publication Year: 1979, Page(s):1080 - 1081
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (198 KB)

    Two new configurations employing the differential voltage-controlled current/voltage source (DVCCS/DVCVS) are proposed for the realization of either an inverting or a noninverting third-order low-pass Butterworth transfer function. Both structures use a minimum of passive components which are of equal value with the capacitors being grounded. The sensitivities of the network parameters are low. View full abstract»

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  • Design of two-dimensional recursive filters with arbitrary support using quarter-plane design algorithms

    Publication Year: 1979, Page(s):1081 - 1083
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    In this note we examine reversible mappings between recursively computable two-dimensional digital filters with arbitrary regions of support and associated filters with quarter-plane support. These mappings allow quarter-plane design algorithms to be used to design more general recursive filters. This treatment applies equally to rectangularly sampled and hexagonally sampled systems. View full abstract»

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  • On maximizing the utility of two existing radio-navigation systems

    Publication Year: 1979, Page(s): 1083
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (150 KB)

    The modulating waveforms for the VHF omnirange (VOR) and instrument landing system (ILS) radio-navigation systems can be generated and demodulated digitally. A computer simulation has given the magnitude of the major error associated with digital methods-namely quantization error. Digital techniques are applicable to the airborne reception and ground monitoring of signals from these systems. View full abstract»

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  • A biological-cell deposition system

    Publication Year: 1979, Page(s):1083 - 1085
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The design and performance of a new device which places biological cells from a suspension onto microscope slides is described. This cell deposition system (CDS) deposits each cell onto a glass microscope glide at an X-Y location determined by the electronically generated sweep (Y) of the minute stream carrying the cells and the orthogonal motion (X) of a micropositioning mechanical stage. A typic... View full abstract»

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  • A forgotten pioneer

    Publication Year: 1979, Page(s): 1085
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (121 KB)

    Edwin F. Northrup should be given reference as an early rocket pioneer and particularly recognized as the pioneer who did the original research behind the application of electromagnetic propulsion to space transport. View full abstract»

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  • Nonlinear systems analysis

    Publication Year: 1979, Page(s): 1086
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  • Surface wave filters: Design, construction, and use

    Publication Year: 1979, Page(s):1086 - 1087
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  • Dynamic system identification experiment design and data analysis

    Publication Year: 1979, Page(s): 1087
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H. Joel Trussell
North Carolina State University