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IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • July 1970

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Displaying Results 1 - 25 of 35
  • Table of contents

    Publication Year: 1970, Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Group

    Publication Year: 1970, Page(s): c2
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    Freely Available from IEEE
  • From the Editors

    Publication Year: 1970, Page(s): 421
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    Freely Available from IEEE
  • A Review of the Graphic Arts Industry

    Publication Year: 1970, Page(s):422 - 431
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6929 KB)

    This paper-part historical, part survey, and part technical -describes the products, methods, and equipments of the graphic arts industry. Although the three main printing processes (letterpress, gravure, and lithography) are emphasized, descriptions of such newer processes as flexography. electrography, and electrostatic printing are covered. This paper may provide the reader with some appreciati... View full abstract»

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  • The Tactical Communications Satellite

    Publication Year: 1970, Page(s):432 - 441
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5405 KB)

    Early in 1969 the U. S. Air Force placed into synchronous orbit the largest communications satellite built to date. This vehicle, the tactical communications satellite (TACSAT), together with a variety of ground terminals, is designed to test experimentally and develop tactical communications concepts for all military services. This paper describes the spacecraft design focusing on the communicati... View full abstract»

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  • Concepts in Computer Control for Frequency Surveillance

    Publication Year: 1970, Page(s):442 - 449
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5498 KB)

    The computer controlled frequency surveillance system utilizes a small computer in conjunction with a digital interface unit, to act as the controller between the computer and two completely programmable receivers. It operates in the frequency range from 20 Hz to 1 GHz with a programmed dynamic range of at least 120 dB. The system can, with proper programming, detect, analyze, correlate, and displ... View full abstract»

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  • Vertical Path Guidance Computer

    Publication Year: 1970, Page(s):450 - 454
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1625 KB)

    A low-cost airborne computer which provides a multiangular glide path for the landing problem is independent of ILS or GCA methods. A barometric altitude signal is divided by slant-range information from a DME interrogator. The resulting ground-based angle is subtracted from the selected approach angle to provide the displayed departure from the glide path. Angular and lineal outputs are available... View full abstract»

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  • Proportional Navigation on Nonstationary Targets

    Publication Year: 1970, Page(s):455 - 457
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1186 KB)

    In a missile flying a proportional navigation course, the missile heading rate is made proportional to the indicated line of sight rate. While for stationary targets the resulting differential equations of motion can be readily integrated, this is no longer the case for moving targets. To obtain closed-form expressions convenient for the evaluation of trajectory parameters, the assumption is made ... View full abstract»

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  • A Coherent Optical Computer System Using the Membrane Light Modulator

    Publication Year: 1970, Page(s):458 - 467
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3930 KB)

    A 32-input coherent optical computer system is described which is driven by a membrane Light modulator (MLM). The MLM has an active area of 4 by 4 mm containing a 32 by 74 array of 2368 38-pm diameter light modulating elements. The optical computer calculates the one-dimensional Fourier transform over 32 points of a phase function in 1 μs. Both the theoretical and actual operating characte... View full abstract»

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  • UV Irradiation Effect on the Electrical Properties of ZnO Thermal Control Coating Pigment

    Publication Year: 1970, Page(s):468 - 472
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1632 KB)

    Electron concentration and Hall mobility have been investigated in pure zinc oxide single crystals, while in the dark and under ultraviolet (UV) excitation. Mode of scattering in ZnO has been determined by studying the temperature dependence of various electrical parameters in the range from -170 to 120°C. It has been observed that the degradation to the crystals by UV irradiation is limited only... View full abstract»

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  • Estimating Optimal Tracking Filter Performance for Manned Maneuvering Targets

    Publication Year: 1970, Page(s):473 - 483
    Cited by:  Papers (589)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2521 KB)

    The majority of tactical weapons systems require that manned maneuverable vehicles, such as aircraft, ships, and submarines, be tracked accurately. An optimal Kalman filter has been derived for this purpose using a target model that is simple to implement and that represents closely the motions of maneuvering targets. Using this filter, parametric tracking accuracy data have been generated as a fu... View full abstract»

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  • An Extension of Viterbi's Analysis of the Cycle Slipping in a First-Order Phase-Locked Loop

    Publication Year: 1970, Page(s):484 - 490
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1563 KB)

    The phenomenon of cycle slipping in a first-order phase-locked loop is reconsidered and a simple expression for the expected number λ of cycles slipped per second is given in the form of a rapidly converging series. In this way the computation of λ becomes much easier than with previously known formulas. A formula allowing the computation of the expected number of cycles gained or ... View full abstract»

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  • High-Speed Homopolar Inductor Alternators of Minimum Leakage Reactance

    Publication Year: 1970, Page(s):491 - 497
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1861 KB)

    The leakage reactance of the machine is expressed as an equation involving slot leakage, end-connection leakage, differential leakage, stator-halves leakage, and tooth-top leakage reactance. This leakage reactance equation, or objective function, is then minimized under suitable constraints. Geometric programming is used to carry through the optimization procedure. A computer program is developed ... View full abstract»

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  • Zener Diodes as Vehicular and Aircraft Transient Suppressors

    Publication Year: 1970, Page(s):498 - 502
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3162 KB)

    The prime purpose of this paper is to describe the characteristics and application of high powered Zener diodes as transient suppressors for transients emanating in ground vehicle and aircraft power supplies. Information is presented on voltage transients as specified in MIL-STD-704 for aircraft and MIL-STD-1275(AT) for military ground vehicles and the ability of advanced high power Zener diodes i... View full abstract»

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  • Adaptive Radar Beacon Forming

    Publication Year: 1970, Page(s):503 - 513
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2345 KB)

    Propagation errors along paths between an array radar and a distribution of targets cause degradations in angle measurements and detection range. The overall objective of the research described in this paper was to analyze and demonstrate the use of conjugate reflections for compensating adverse effects of path errors. The effect of reflecting the conjugate of an incident wave is described mathema... View full abstract»

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  • An Aspect of Determining the Range of Radar Detection

    Publication Year: 1970, Page(s):514 - 521
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2061 KB)

    The determination of the range of radar is carried out according to statistical methods which are not always immediate. For this reason, a parametrical method is proposed which condenses the elements necessary for this calculation in the form of three abaci. Furthermore, a general formula condenses this result, and the formula is extended to the other transmission systems. View full abstract»

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  • Detection Results for Scanning Radars Employing Feedback Integration

    Publication Year: 1970, Page(s):522 - 527
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1681 KB)

    A method is presented for the calculation of the detection probabilities for a scanning radar employing feedback integration. An equation is developed for the optimum feedbacd value̲ the equation holds for small and large sample sizes and for fluctuating and nonfluctuating targets. Then, a value for the antenna beam-shape factor is given which enables one to calculate detection probabiliti... View full abstract»

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  • Estimation of Phase Difference in Multiple Sensor Arrays

    Publication Year: 1970, Page(s):528 - 533
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1733 KB)

    The likelihood functional for estimating parameter differences in coherent multiple-sensor receivers is developed assuming Gaussian statistics on both signal and noise. The development relies on a matrix formulation and a subsequent factorization of a parameter constraint matrix from the signal matrix. A two-antenna phase-difference radar example is presented for cases of uncorrelated and antenna-... View full abstract»

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  • An Alternate Approach to the Prediction of Polynomial Signals in Noise from Discrete Data

    Publication Year: 1970, Page(s):534 - 543
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2171 KB)

    When the problem of predicting the past, present, or future value of a polynomial signal or any of its derivatives is considered, where the signal is in white Gaussian noise, the standard approach has been to minimize mean-square-error with constraints by use of Lagrange multipliers. In this paper an alternate approach is described, using results of Rao and Bhattacharyya from the statistical liter... View full abstract»

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  • Principles Involved in the LM Rendezvous Radar Redundant Gyro System

    Publication Year: 1970, Page(s):544 - 550
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1046 KB)

    For typical failure rates the probability of two or more of four gyros failing is very much less than one or both of two. Thus, a single redundancy system of four gyros greatly enhances system reliability. The orientation of the sensitive axes of four gyros is specified and means of generating outputs dependent only on gyro inconsistencies are defined. The voting logic and plots of switching decis... View full abstract»

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  • Activity Planning for the Space Station

    Publication Year: 1970, Page(s):551 - 555
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2397 KB)

    This paper presents an overview of the identification and selection process of experiments and payloads for manned space flight missions, emphasizing the scope and magnitude of the problem of doing activity planning and the need for a methodology to assure timely flight and appropriate spacecraft design. Conclusions and results derived from the past several years are presented together with an ana... View full abstract»

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  • Pointing and Stability Requirements for Earth Orbital Experiments

    Publication Year: 1970, Page(s):556 - 564
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3406 KB)

    Experiments for manned and unmanned space facilities of the next decade will impose stringent requirements for accurately pointing and/or maintaining stability of the space platforms over extended periods. Potential experiment programs identified to date in various NASA-and contractor-sponsored studies have been reviewed in order to define critical values and ranges for the following pointing/stab... View full abstract»

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  • Logistics Transportation for Space Station Support

    Publication Year: 1970, Page(s):565 - 574
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6033 KB)

    Logistics support of a long duration space station will dictate a high degree of space flight activity to rotate personnel and transport supplies and equipment. Systems characteristics and mission requirements for space station logistics have been analyzed within the context of a broad spectrum of space missions. Preliminary concepts for a space shuttle system (space transportation) have been deve... View full abstract»

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  • APPA: A Phased Array System Designed for Space Application

    Publication Year: 1970, Page(s):575 - 584
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3671 KB)

    Artificial pilot phased array (APPA) is a system designed for application as a multiple narrow-beam communication satellite. The design uses an adaptive array principle in a multiple-beam configuration. Two ground pilot signals are used to make beam steering independent of array attitude. Beam steering is accomplished without the requirement of user pilots by deriving array phase shifter settings ... View full abstract»

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  • Application of Recursive Estimation and Kalman Filtering to Doppler Tracking

    Publication Year: 1970, Page(s):585 - 592
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2497 KB)

    The techniques of recursive estimation and Kalman filtering are applied to the problem of estimation of space vehicle orbits and trajectories using only measurements of the Doppler shifts in radio signals transmitted by or reflected from the target. Two approaches are described. One is a global fit technique in which the parameters of an assumed trajectory model are estimated. The second is a poin... 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