Proceedings of the IEEE

Issue 2 • Feb. 1987

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): c1
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  • Scanning the issue

    Publication Year: 1987, Page(s): 179
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  • Proceedings editorial board

    Publication Year: 1987, Page(s):180 - 184
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  • Adaptive feedback control

    Publication Year: 1987, Page(s):185 - 217
    Cited by:  Papers (177)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3272 KB)

    Adaptive control is now finding its way into the marketplace after many years of effort. This paper reviews some ideas used to design adaptive control systems. It covers early ideas which primarily attempt to compensate for gain variations and more general methods like gain scheduling, model reference adaptive control, and self-tuning regulators. It is shown that adaptive control laws can be obtai... View full abstract»

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  • Exploring space plasmas—The WISP/HF experiment

    Publication Year: 1987, Page(s):218 - 235
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1959 KB)

    WISP/HF is the high-frequency part of the collaborative U.S.- Canada investigation, Waves In Space Plasmas. Instrumentation is being developed that will be flown on NASA's Space Shuttle starting with the Space Plasma Lab missions in the 1990s. Using a high-inclination orbit at heights near the maximum density of the ionospheric F region, active experiments will be carried out on antennas, electrom... View full abstract»

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  • Coherence and time delay estimation

    Publication Year: 1987, Page(s):236 - 255
    Cited by:  Papers (432)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1637 KB)

    This paper presents a tutorial review of work in coherence and time delay estimation. A review of coherence research and development is presented. A derivation of the ML estimator for time delay is presented together with an interpretation of that estimator as a special member of a class of generalized cross correlators. The performance of the estimator is given for both high and low signal-to-noi... View full abstract»

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  • Inductance formula for a single-layer circular coil

    Publication Year: 1987, Page(s):256 - 257
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (195 KB)

    The analytical formulas for the self-inductance of a cylindrical current sheet (solenoid of any size) and the mutual inductance of two coaxial current loops are presented. A simple iteration method for evaluating the formulas to any desired degree of accuracy is also discussed. View full abstract»

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  • A novel technique for the on-chip tuning of monolithic filters

    Publication Year: 1987, Page(s):257 - 258
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (177 KB)

    Monolithic analog filters, with the exception of switched capacitor filters need on-chip tuning. Existing schemes of PLL and master-slave techniques use phase control for tuning. The proposed method uses amplitude detection, where the reference voltage itself is derived from the input. Much work has recently been done on active RC continuous-time filters in VLSI [4]-[8]. The heart of all such syst... View full abstract»

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  • The influence of eddy currents on magnetic actuator performance

    Publication Year: 1987, Page(s):259 - 260
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (174 KB)

    In this letter the effects of eddy currents on the transient performance of electromagnetic actuators is discussed. It is shown that a transfer function representation, that includes a first-order model of the eddy current influence, can be obtained which is suitable for control system analysis. View full abstract»

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  • On the resolution and contrast of microwave images using a complete first-order iterative algorithm

    Publication Year: 1987, Page(s):260 - 262
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (326 KB)

    The quality of microwave images achievable using a complete first-order iterative algorithm has been described with reference to a complex biological target. The results indicate the possibility of attaining resolution in the level of one-tenth of the wavelength. The contrast is shown to be excellent in picturing the loss part, whereas it is rather poor for the real-part image. View full abstract»

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  • A fast square-rooting algorithm using a digital signal processor

    Publication Year: 1987, Page(s):262 - 264
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (292 KB)

    The computation of square roots is required in signal processing applications, such as adaptive filtering using transversal filters or lattice filters, spectral estimation, and many other fields of engineering sciences. Actually, all the existing digital signal processors (DSP) have a multiplier-accumulator. We present a simple binary algorithm for square-rooting using a processor with multiplier.... View full abstract»

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  • A three-dimensional DFT algorithm using the fast Hartley transform

    Publication Year: 1987, Page(s):264 - 266
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (298 KB)

    A three-dimensional (3-D) Discrete Fourier Transform (DFT) algorithm for real data using the one-dimensional Fast Hartley Transform (FHT) is introduced. It requires the same number of one-dimensional transforms as a direct FFT approach but is simpler and retains the speed advantage that is characteristic of the Hartley approach. The method utilizes a decomposition of the cas function kernel of the... View full abstract»

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  • Multidimensional Hartley transforms

    Publication Year: 1987, Page(s): 267
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (148 KB)

    The computational effort required for multidimensional Hartley transforming is estimated. View full abstract»

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  • Quasi-linear controllable inductor

    Publication Year: 1987, Page(s):267 - 269
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (635 KB)

    A magnetic structure consisting of two ferromagnetic cores and three windings is shown to behave as a quasi-linear electronically controllable inductor. Together with the controllable resistor and capacitor it constitutes a complete set of components with electronically variable fundamental electrical properties: resistance, capacitance, and inductance. In contrast to the other two components, the... View full abstract»

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  • Digial processing of signals: Theory and practice

    Publication Year: 1987, Page(s):270 - 271
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  • Book alert

    Publication Year: 1987, Page(s): 271
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  • [Back cover]

    Publication Year: 1987, Page(s): c4
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Meet Our Editors

Editor-in-Chief
H. Joel Trussell
North Carolina State University