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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • May 1971

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Displaying Results 1 - 25 of 34
  • Table of contents

    Publication Year: 1971, Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Group

    Publication Year: 1971, Page(s): c2
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    Freely Available from IEEE
  • From the Editors

    Publication Year: 1971, Page(s): 417
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  • Slow Death of a Free Profession

    Publication Year: 1971, Page(s):418 - 428
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3210 KB)

    The Scientific Revolution of the twentieth century has been exploited and subverted in our country by the "political-scientific" complex. This complex has discarded our traditional system under which the planning and organizing of productive scientific ventures has been in the hands of responsible professional engineers whose first duty is to serve the best interests of the public. Instead, this c... View full abstract»

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  • The Military Industrial Complex

    Publication Year: 1971, Page(s):429 - 433
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    First Page of the Article
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  • Some Remarks on Velocity-Aided Kalman Filtering

    Publication Year: 1971, Page(s):434 - 437
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1038 KB)

    This paper extends recent work of Nishimura to consider velocity-aided Kalman filtering for one-dimensional motion under random acceleration. It is shown through examination of the steady-state solution and the transient time constants that estimates incorporating velocity observations can be significantly improved over estimates based on range data alone. View full abstract»

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  • A System Approach to Urban Transportation in Detroit

    Publication Year: 1971, Page(s):438 - 442
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    An "anti-system" and a "system" approach : to building a new subway system in Detroit is presented, together with the alternatives imposed by the actual conditions as opposed to the ideal solution. View full abstract»

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  • Reflections on Muddied Waters

    Publication Year: 1971, Page(s):443 - 447
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    One morning I awoke with the disquieting feeling that I had been here before; confronted with a war, a sagging economy, the prospect of a cut in research funds, and a generation gap. A look at past Anglo-American wars and recessions over a 300-year period shows that they occur every 25 years on the average, i. e., about every generation. There are signs that the rising generation will bail us out. View full abstract»

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  • Display of Urban Growth Patterns

    Publication Year: 1971, Page(s):448 - 458
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7294 KB)

    A dynamic approach to the construction of an urban growth model for alternative evaluations is presented. Both urban growth theory and an attempt to couple computers and display technology into a new system are covered. View full abstract»

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  • Spectrum for the Seventies and Beyond

    Publication Year: 1971, Page(s):459 - 461
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    Radio frequency spectrum management for the 1970's is discussed, with the role of IEEE's Joint Technical Advisory Committee defined. View full abstract»

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  • Optimum Linear Estimation of Stochastic Signals in the Presence of Multiplicative Noise

    Publication Year: 1971, Page(s):462 - 468
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1410 KB)

    This paper considers optimum (MMSE) linear recursive estimation of stochastic signals in the presence of multiplicative noise in addition to measurement noise. Often problems associated with phenomena such as fading or reflection of the transmitted signal at an ionospheric layer, and also situations involving sampling, gating, or amplitude modulation, can be cast into such formulation. The differe... View full abstract»

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  • Gated Phase-Locked Loop Study

    Publication Year: 1971, Page(s):469 - 477
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1660 KB)

    The objectives of this paper are threefold. The first is to obtain a sampled data model of a gated phase-locked loop. Data from measurements made on an actual loop constructed in the laboratory are included, and the good agreement between measured and calculated results serves as a verification of the model. Second, with the aid of the model, some of the basic operating properties of the system wi... View full abstract»

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  • A Delay-Lock Loop for Tracking Pulsed-Envelope Signals

    Publication Year: 1971, Page(s):478 - 485
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1925 KB)

    A sampled-data delay-lock loop (SDDLL) which tracks the arrival time of a biphase modulated, pulsed-envelope RF signal is described. A pseudo-noise (PN) code generator is used as the modulation source as in conventional delay-lock loop tracking devices. Time base shifting of the loop's local clock is performed by digital means. The technique permits the use of a stable-frequency clock to maintain ... View full abstract»

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  • Some Results on Pulse-Burst Radar Design

    Publication Year: 1971, Page(s):486 - 498
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2859 KB)

    Pulse-burst radar attempts to capitalize on the advantages of both low and high PRF radar while minimizing their disadvantages. Optimization procedures are applied to the choice of transmitter signal and receiver weighting. The results are compared to the use of Tschebyscheff transmitter weighting with an optimized receiver. The effects of various design and operational parameters are indicated. T... View full abstract»

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  • Synthetic Aperture Imaging Radar and Moving Targets

    Publication Year: 1971, Page(s):499 - 505
    Cited by:  Papers (282)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1957 KB)

    This paper considers the effects of slowly moving targets as they appear in the output of an airborne coherent side-looking synthetic aperture imaging radar. The image of a moving reflector is described, and two approaches to airborne moving target indication (AMTI) are summarized. It is shown that the effects of target movement are decreased as the radar scan rate is increased, and are increased ... View full abstract»

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  • Optimal and Suboptimal Control Synthesis for Minimum Time VTOL Transition

    Publication Year: 1971, Page(s):506 - 520
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2404 KB)

    Optimal open-loop and suboptimal closed-loop controls for a VTOL aircraft in a minimum climb-to-cruise time transition are presented in this paper. The optimal open-loop controls are synthesized by a proposed gradient technique which provides for the selection of desired changes in physically meaningful parameters during each iteration step. The suboptimal closed-loop controls are synthesized as i... View full abstract»

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  • Analysis of a Class of Nonlinear Sampled-Data Systems with a Gaussian Input Signal

    Publication Year: 1971, Page(s):521 - 527
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1801 KB)

    The problem treated here is the analysis of a class of nonlinear sampled-data systems with a Gaussian input signal. The nonlinear element is a symmetrical limiter (memoryless device) that feeds the linear element. Preceding the limiter is a sampler and zero-order hold unit for data reconstruction. The analysis is predicated on finding an equivalent gain for the nonlinear element such that the mean... View full abstract»

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  • A Design for Thick Film Microcircuit DC-to-DC Converter Electronics

    Publication Year: 1971, Page(s):528 - 531
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2550 KB)

    The design concept for thick film microcircuit dc-to-dc converter electronics used in the power subsystem of the Thermoelectric Outer Planet Spacecraft is presented. Microcircuits have been used in low power logic circuits for nearly ten years, but only recently have these techniques been applied to power subsystem circuits which operate at higher power levels. Thick film microcircuit techniques h... View full abstract»

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  • An Algorithm Providing All-Attitude Capability for Three-Gimballed Inertial Systems

    Publication Year: 1971, Page(s):532 - 543
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2205 KB)

    This paper describes an algorithm which protects a three-gimballed inertial system against gimbal lock while preserving the inertial reference. One sample of the gimbal angles and gimbal angle rates for a torque-free dynamic vehicle provides the information needed to determine whether or not gimbal lock will occur at some later time. When gimbal lock is imminent, the inertial platform is commanded... View full abstract»

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  • Development of a Low-Power Digital Inertial Reference Assembly

    Publication Year: 1971, Page(s):544 - 549
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1573 KB)

    Current and projected system requirements for inertial reference assemblies emphasize high accuracy, long life, and low power. An inertial reference assembly ( IRA) which embodies the aforementioned characteristics was developed recently. Pulse rebalanced gas-bearing gyroscopes were used to attain high accuracy and long life. Temperature compensation of gyroscope parameters (in lieu of temperature... View full abstract»

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  • Comments on the May 1970 Issue

    Publication Year: 1971, Page(s): 550
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  • Comments on the January 1971 Issue

    Publication Year: 1971, Page(s):550 - 551
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  • An X-Band Focussed-Beam Interferometer for Plasma Diagnostics

    Publication Year: 1971, Page(s):551 - 553
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (974 KB)

    A microwave interferometer which permits the measurement of phase shift in a plasma independent of propagation path attenuation over a 30-dB dynamic range is described. Results are presented from an experimental evaluation of measurement accuracy of the interferometer instrument. View full abstract»

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  • Further Results on the Detection of Targets in Non-Gaussian Sea Clutter

    Publication Year: 1971, Page(s):553 - 556
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    A recent work calculated the probabilities of detection and false alarm for the mean and median detectors for the log-normal and contaminated-normal descriptions of sea clutter. This correspondence extends the previous work by first calculating the performance of the trimmed-mean detector and then calculating the detection performance of all three detectors when the target exhibits Rayleigh fluctu... View full abstract»

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  • The Calculation of Frequency-Modulation Distortion in Linear Networks

    Publication Year: 1971, Page(s):556 - 561
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (887 KB)

    A numerical method is developed for the calculation of steady-state FM distortion in a linear passive network from the character of the FM signal input and the steady-state transfer characteristics of the network. The method of calculating FM distortion requires the solution of a finite set of linear equations which is accomplished readily by a digital computer. To illustrate the use of the method... View full abstract»

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Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the organization, design, development, integration, and operation of complex systems for space, air, ocean, or ground environment.  These systems include, but are not limited to, navigation, avionics, spacecraft, aerospace power, radar, sonar, telemetry, defense, transportation, automated testing, and command and control. 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory