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Proceedings of the IEEE

Issue 5 • May 1978

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Displaying Results 1 - 25 of 31
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1978, Page(s): 531
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  • Statistical geodesy—An engineering perspective

    Publication Year: 1978, Page(s):532 - 550
    Cited by:  Papers (5)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1773 KB)

    Motivated largely by the needs of the navigation community, engineers have become increasingly involved in understanding and modeling the fine structure of the earth's gravity field. In this endeavor, the engineer has augmented the applied mathematical tools of the "geodesist-scientist" with those of modern estimation and control theory, state-space mathematics, and random process theory. One of t... View full abstract»

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  • Density reconstruction using arbitrary ray-sampling schemes

    Publication Year: 1978, Page(s):551 - 562
    Cited by:  Papers (60)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4006 KB)

    Methods for calculating the distribution of absorption densities in a cross section through an object from density intergrals along rays in the plane of the cross section are well-known, but are restricted to particular geometries of data collection. So-called convolutional-back projection-summation methods, used now for parallelray data, have recently been extended to special cases of the fan-bea... View full abstract»

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  • Tutorial review of synthetic-aperture radar (SAR) with applications to imaging of the ocean surface

    Publication Year: 1978, Page(s):563 - 583
    Cited by:  Papers (157)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5376 KB)

    A synthetic aperture radar (SAR) can produce high-resolution two-dimensional images of mapped areas. The SAR comprises a pulsed transmitter, an antenna, and a phase-coherent receiver. The SAR is borne by a constant velocity vehicle such as an aircraft or satellite, with the antenna beam axis oriented obliquely to the velocity vector. The image plane is defined by the velocity vector and antenna be... View full abstract»

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  • On an adaptive algorithm for IIR filters

    Publication Year: 1978, Page(s):585 - 588
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The purpose of this communication is to discuss an IIR adaptive filter algorithm developed by Stearns [1], in terms of an example that appeared in a recent article [2]. The example concerns the approximation of a fixed second-order filter by a first-order adaptive filter, when subjected to a white noise input. View full abstract»

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  • New conversion methods for realizing nonminimum phase transfer functions

    Publication Year: 1978, Page(s):588 - 590
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    New methods are described for converting second-order active-RC low-pass, high-pass, and bandpass filters to obtain nonminimum phase-transfer characteristics. Some of the realizations obtained are superior to other realizations arrived at using well-known conversion methods. Design equations for each realization are summarized in a table. Experimental results are included. View full abstract»

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  • Comments on "A novel 'follow the master' filter"

    Publication Year: 1978, Page(s):590 - 592
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB)

    The above work presents a technique for stabilizing the pole-frequency (ω0) of active R filters which is essentially identical to one reported earlier, but in which different conclusions are obtained concerning the technique's merits. Amplifier excess phase will generally cause pole-Q deviations with temperature even if ω0is stabilized; therefore, most of the conclu... View full abstract»

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  • Flat magnitude low-pass filters with a pair of imaginary-axis zeros

    Publication Year: 1978, Page(s):592 - 594
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (231 KB)

    It is known that the cutoff rate of a maximally flat low-pass filter can be improved either by introducing a pair of imaginary-axis zeros or relaxing the flatness condition. Making use of both techniques simultaneously, this correspondence describes how to design an nth-order low-pass filter with (n - 2) degree of flatness at ω = 0 rad/s and also including a pair of imaginary-axis zeros. Adva... View full abstract»

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  • A recursive digital filter with maximally flat linear phase at an arbitrary specified frequency

    Publication Year: 1978, Page(s):594 - 596
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB)

    An available recursive digital low-pass filter with constant group delay cannot be spectral transformed to give, for example, a bandpass filter which also has constant group delay. This correspondence describes a technique, using Gauss-Jordan elimination, to design a recursive digital filter with maximally flat linear phase at an arbitrary specified frequency. View full abstract»

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  • True noninverting integrators with single grounded capacitor

    Publication Year: 1978, Page(s):596 - 597
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB)

    Four new active integrator configurations are reported. All the circuits use single grounded capacitors. View full abstract»

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  • Incremental output resistance of a Wilson-current mirror

    Publication Year: 1978, Page(s):597 - 598
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB)

    The use of the 'Early' voltage parameter facilitates the derivation of simple limit expressions for the low-frequency incremental output resistance of a Wilson-current source in which the constituent bipolar devices are assumed to have characteristics that are not necessarily identical. View full abstract»

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  • Optimum built-in barrier height utilizing an extended concept of impedance matching

    Publication Year: 1978, Page(s):598 - 599
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB)

    Schottky-barrier height optimization for high-frequency usage is analytically discussed with an extended concept of impedance matching. The optimum value of 0.3 eV is almost a universal constant under various operating conditions, and agrees well with the previous prediction obtained by large signal simulation and InxGa1-xAs experiments. View full abstract»

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  • LED charge-control model and speed at high currents

    Publication Year: 1978, Page(s):599 - 601
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    A simple charge-control model for light-emitting diodes exists. The equation may be applied to both waveform analysis and synthesis (current preshaping). At high current levels, the cutoff frequencies are higher than predicted from the static high-injection lifetimes alone. The harmonic contents in the output may be frequency dependent at high current levels and cannot be completely determined fro... View full abstract»

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  • Predistortion technique for the measurement of transfer inefficiency of charge-transfer devices

    Publication Year: 1978, Page(s):601 - 602
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (203 KB)

    A simple technique for the measurement of transfer inefficiency of charge-transfer devices is proposed. It requires equalization of the magnitude of two consecutive pulses at the output by introducing a known distortion in the square-wave input. The amount of distortion introduced gives a measure of inefficiency. View full abstract»

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  • Time-resolving high-intensity laser-light detectors: A possible new photoconductive device

    Publication Year: 1978, Page(s):602 - 604
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB)

    High-power laser-light detectors belong to two main categories: integrated-response detectors (joulemeter) or time-resolving detectors (photomultiplier or high-gain fast diodes). It is shown in this paper that photoconductive materials, such as stannic oxide monocrystals, can reconcile the specifications of both categories: mechanical and thermal strength, response time, linearity, and so on. View full abstract»

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  • A receiver with m-level integration

    Publication Year: 1978, Page(s):604 - 605
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    Using the information obtained by quantizing a sampled signal into m-levels, the optimal decision rule is given for the classification as noise alone or noise with signal. This is a generalization of Szajnowski's result [4]. Expressions for the detection and false-alarm probabilities are given. View full abstract»

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  • A uniformly distributed analog random voltage generator

    Publication Year: 1978, Page(s):605 - 606
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Whereas random number generating methods are numerous, uniformly distributed analog random voltages are difficult to obtain directly. A method based upon the use of a point process is proposed, which leads to a practical noise generator with accurate uniform amplitude distribution, which is very easy to implement. View full abstract»

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  • Photoelectronic phase and frequency modulation

    Publication Year: 1978, Page(s):606 - 607
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (270 KB)

    Phase and frequency modulation can most directly be effected by a nonlinear device whose output is a sinusoidal function of its input. While no electronic device exhibits this property, electrooptical systems can be designed with exactly this sinusoidal nonlinearity. This provides the basis for novel schemes of PM and FM. View full abstract»

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  • Accurate fan-beam reconstruction

    Publication Year: 1978, Page(s):608 - 609
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (241 KB)

    The equation is derived for obtaining the exact reconstruction of a two-dimensional distribution from one-dimensional fan-beam scans. View full abstract»

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  • Comments on "A new imaging principle"

    Publication Year: 1978, Page(s):609 - 610
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Comments are offered on a new imaging principle described in two papers by Professor N. H. Farhat claiming the ability to separate targets closely spaced in angle. It is shown here that the proposed "transmitter-receiver system" leads to resolution in range, not angle. View full abstract»

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  • Nuclear reactor analysis

    Publication Year: 1978, Page(s):611 - 612
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    Freely Available from IEEE
  • Introduction to communications systems

    Publication Year: 1978, Page(s): 612
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    Freely Available from IEEE
  • Handbook of technical writing

    Publication Year: 1978, Page(s):612 - 613
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    Freely Available from IEEE
  • Electronic circuit analysis and design

    Publication Year: 1978, Page(s): 613
    Request permission for commercial reuse | PDF file iconPDF (175 KB)
    Freely Available from IEEE

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H. Joel Trussell
North Carolina State University