IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • March 1971

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Displaying Results 1 - 25 of 38
  • Table of contents

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

    Publication Year: 1971, Page(s): c2
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  • From the Editors

    Publication Year: 1971, Page(s): 225
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  • The Use of Extraterrestrial Radio Sources in the Measurement of Antenna Parameters

    Publication Year: 1971, Page(s):226 - 234
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2061 KB)

    Extraterrestrial radio sources, whose emission characteristics (flux density, spectrum, angular size) and coordinates have been firmly established by careful observations, have application in the measurement of the effective area (aperture efficiency and gain) of an antenna and its radiation pattern. The radio-emission characteristics of the strong discrete (celestial) radio sources, of the sun, a... View full abstract»

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  • Earth Footprints of Satellite Antennas

    Publication Year: 1971, Page(s):235 - 242
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1596 KB)

    This paper develops the expressions for computing the footprint on Earth (i.e., power density contours) of a satellite antenna. The expression for determining the antenna pattern coordinate as a function of the Earth coordinates is derived. The antenna pattern operator which converts the pattern function into the available power density is obtained. In this case it is assumed that the Earth-based ... View full abstract»

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  • Refractive Errors in Angle-of-Elevation Measurements

    Publication Year: 1971, Page(s):243 - 247
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1327 KB)

    It is shown that the errors associated with radio elevation measurements may be investigated systematically using a variational technique. The error occurring when spaced antennas are used is compared with that for a single directional antenna. Integral expressions are obtained for the refractive errors. View full abstract»

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  • Long-Range Trajectory Prediction Errors for Least-Squares Smoothing

    Publication Year: 1971, Page(s):248 - 253
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1205 KB)

    This paper presents exact formulas and graphs to determine the root-mean-square error of prediction for position and velocity estimates of an object, based on least-squares smoothing. The prediction interval is taken from an endpoint estimate up to ten times the smoothing interval. The rms values may be used to determine how large a search volume must be to accommodate a substantial data dropout i... View full abstract»

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  • Control-Loop Noise in Adaptive Array Antennas

    Publication Year: 1971, Page(s):254 - 262
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2213 KB)

    Adaptive array receiving antennas can be designed to sense the external noise field and to optimize the array illumination function. A substantial improvement in signal-to-noise ratio can be obtained with adaptive arrays when the external noise field is nonuniformly distributed in angle. The external noise process may be time varying and contain both discrete sources and continuously distributed s... View full abstract»

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  • A Domestic Satellite Design

    Publication Year: 1971, Page(s):263 - 268
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2470 KB)

    This paper deals with the design parameters of a communications satellite which would be capable of providing domestic telephony, data, and television distribution services. Certain important aspects of the design are discussed, including satellite antenna beam coverage, transponder bandwidth, and transponder radiated power for a given weight range. A baseline satellite design is then presented wh... View full abstract»

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  • Stretch: A Time-Transformation Technique

    Publication Year: 1971, Page(s):269 - 278
    Cited by:  Papers (121)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3988 KB)

    Stretch is a passive, linear, time-variant technique for performing temporal operations on many classes of signals. The technique employs three dispersive networks and a mixer. Signal slowdown, speedup, or time reversal can be attained by choice of network slopes. These temporal operations are performed within a signal "window," and the duration of the window is determined by the network time-band... View full abstract»

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  • Interference Effects of Pseudo-Random Frequency-Hopping Signals

    Publication Year: 1971, Page(s):279 - 287
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2151 KB)

    When a pseudo-random frequency-hopping signal is intercepted by a conventional receiver operating within the same frequency band, the interfering signal has the form of a pulse-amplitude modulated signal. Each pulse amplitude is dependent upon the hopping frequency and the selectivity characteristic of the victim receiver. The probability density function for the interfering pulse amplitude prior ... View full abstract»

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  • Spacecraft Attitude Measurement Using Spatial Coherence of Laser or Star Light

    Publication Year: 1971, Page(s):288 - 298
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3141 KB)

    A new method of measuring the attitude of spacecraft with respect to a reference beam of laser light or star light is described. The method uses the spatial coherence property of these beams and provides accuracies of ± 0.01 second of arc or greater. After giving a general description of the method, the feasibility of constructing such systems using presently available lasers and detectors is est... View full abstract»

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  • Synthesis of an Optimal Output Regulating System with a Reference Vector

    Publication Year: 1971, Page(s):299 - 315
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3183 KB)

    The difficult problem of synthesizing an optimal regulation scheme for linear time-invariant systems, assuming an integral quadratic cost functional, when the desired output is a constant nonzero vector and when the upper time limit approaches infinity, is studied in this paper. The problem is solved by properly redefining the cost functional, so that consistence with the stability requirement is ... View full abstract»

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  • The Effect of Satellite Spin on Two-Way Doppler Rangerate Measurements

    Publication Year: 1971, Page(s):316 - 320
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1649 KB)

    The rotation of a spin-stabilized satellite employing a turnstile antenna for reception and retransmission affects two-way Doppler range-rate measurements. Two different types of tracking systems are considered and, in both systems, the range-rate measurement is changed by the amount begin{equation*} |Delta dot{r}| = frac{|1 pm 1/k|}{2} lambda_{t}f_{s} end{equation*} where k is the turn-around rat... View full abstract»

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  • Distortion Reduction in Phase Modulation

    Publication Year: 1971, Page(s):321 - 323
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1276 KB)

    When a phase-modulated carrier of the form sin (wt+ϕ) is multiplied by cos (wt), the recovered phase modulation is sin (ϕ), which is a distorted version of . For small ϕ, the error is small, but is appreciable as A approaches unity or more. When ϕ is complicated (several subcarriers for example), the intermodulation can seriously degrade the system. This paper discu... View full abstract»

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  • Highlights of a Brushless Direct-Drive Solar Array Control System Design

    Publication Year: 1971, Page(s):324 - 328
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (711 KB)

    This paper summarizes a drive system design for controlling the position and rate of solar power arrays on orbiting spacecraft. There are no gears or sliding contact elements used anywhere in the system and only low-speed bearings are needed. Such mechanization is particularly well suited to solid lubrication techniques, and wear rates are very low, so that the drive system can operate directly in... View full abstract»

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  • The Feasibility of Packaging High-Frequency Microcircuits Inside the Magnetic Core

    Publication Year: 1971, Page(s):329 - 331
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1400 KB)

    A design goal for miniaturization has long been the elimination of the magnetic circuit. In practice, the size/weight penalties are decreased by operation at higher frequency where core size can be effectively reduced. When microcircuitry is considered, the magnetic circuit is designed out. Either RC or active networks replace inductance, or it is externally added to the microcircuit. This paper w... View full abstract»

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  • Silicon Solar Cells at Low Temperature

    Publication Year: 1971, Page(s):332 - 339
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2254 KB)

    Electrical characteristics of n-p silicon solar cells have been obtained experimentally over the temperature range of +28 to ¿175° and for illumination intensities from 140 to 1.5 mW/cm2. Critical parameters and their distribution are presented for several hundred solar cells from various manufacturers. The effect of cell selection either to a minimum power output at 28° at 5 mW/cm2 or to a min... View full abstract»

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  • Analysis of Modeling and Bias Errors in Discrete-Time State Estimation

    Publication Year: 1971, Page(s):340 - 354
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3508 KB)

    This paper concerns the effects of modeling and bias errors in discrete-time state estimation. The newly derived algorithms include the effect of correlation between plant and measurement noise in the system. The effects of nonzero mean noise terms and bias errors are considered. With plant or measurement matrix errors, divergence can occur. The local or linear sensitivity approach to error analys... View full abstract»

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  • Estimation Using Stochastic Feedback with Applications to Integrated Navigation Systems

    Publication Year: 1971, Page(s):355 - 366
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2086 KB)

    This paper discusses an approach to linear estimation through use of a "control" fed back into the system to cancel out the effect of disturbances or error signals. Although this approach has very restricted application, it has found important usage in integrated navigation systems where one subsystem is an inertial measurement system. This approach is shown to be suboptimal and is compared with t... View full abstract»

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  • Performance Analysis of the Modulation Cancellation Altimeter

    Publication Year: 1971, Page(s):367 - 378
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2290 KB)

    The performance of the modulation cancellation altimeter is investigated. Several sources of error are considered, specifically: 1) terrain averaging error; 2) output noise fluctuations; 3) errors due to phase shifts; and 4) acquisition ambiguities. The predominant parameters affecting these errors are investigated with a view towards optimizing the performance of the altimeter. View full abstract»

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  • Application of Decision Theory to the Testing of Large Systems

    Publication Year: 1971, Page(s):379 - 384
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1887 KB)

    A methodology for determining priorities in allocating test resources among the various subsystems within a large system is described. The methodology is based on concepts from applied decision theory. Two versions of the methodology are presented: a complete version, called the extensive form, and an approximate version, called the diminutive form. View full abstract»

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  • Preliminary Analysis of a Proposed High-Stability Frequency Standard Distribution System

    Publication Year: 1971, Page(s):385 - 391
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1975 KB)

    A system for distributing a frequency reference, which involves the use of geostationary satellites and two-way microwave transmissions, seems capable of stabilities exceeding those of primary atomic standards. The principal sources of error are instabilities in oscillators in the system, imperfect geostationary orbits, additive noise, and radio propagation effects. Even extreme assumptions of pro... View full abstract»

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  • The Practical Problem of Radar Cross-Section Analysis

    Publication Year: 1971, Page(s):392 - 395
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (775 KB)

    Despite recent advances in computational and experimental technology, many approximate methods are of considerable practical value in the field of radar cross-section (RCS) analysis. This is true particularly where time and/or funding is limited. Here we shall examine RCS data both in the high-frequency and in the lowfrequency ranges to illustrate some of the advantages which accrue from the appli... View full abstract»

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  • Correction to "Performance of Manchester Coded FSK"

    Publication Year: 1971, Page(s): 395
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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
Michael Rice
Brigham Young University