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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • March 1979

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Displaying Results 1 - 25 of 27
  • Table of contents

    Publication Year: 1979, Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1979, Page(s):c2 - 304b
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  • From the Editors

    Publication Year: 1979, Page(s): 193
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  • Semipassive Pitch Attitude Control of Satellites by Solar Radiation Pressure

    Publication Year: 1979, Page(s):194 - 198
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1377 KB)

    Pitch attitude control of earth-pointing satellites by solar radiation pressure is investigated. Development of a controller that is simple to implement and yet promises asymptotic stability of the system is presented. The analysis establishes the capability of the solar controller in stabilizing even the gravitationally unstable equilibrium orientation. The semipassive nature of the system promis... View full abstract»

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  • Nonsaturating Satellite Open-Loop Feedback Controls

    Publication Year: 1979, Page(s):199 - 203
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1139 KB)

    The dynamics of a zero-momentum three-axis attitude controlled satellite is used to formulate an optimal control problem, which is then solved for the special case where the flywheels operate in a nonsaturating mode. The results then serve as guidelines in the design of simple open-loop and feedback controllers. View full abstract»

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  • Position Finding with Prior Knowledge of Covariance Parameters

    Publication Year: 1979, Page(s):204 - 208
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1115 KB)

    Butterly [1] presents a Bayesian approach as an alternative to the classical methods for solving the position-finding problem. Butterly assumes that bearing errors are independent and normally distributed with known variances. In the paper, the assumption of known variances is relaxed and it is shown that uncertainty about these variances can be incorporated into the model while also retaining the... View full abstract»

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  • Optimum Design of RC Snubbers for Switching Regulators

    Publication Year: 1979, Page(s):209 - 218
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2176 KB)

    The optimum design of an RC snubber to suppress the surge voltage across the transistor in a switching regulator with a two-winding reactor is presented. Analyzing the surge voltage by means of high-frequency equivalent circuits, we obtain the third-order characteristic equation. This third-order equation is first analyzed by the aid of the root locus method. As a result, the region where the surg... View full abstract»

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  • Maximun Posterion Probability Demodulation of Angle-Modulated Signals

    Publication Year: 1979, Page(s):219 - 227
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1851 KB)

    An algorithm is presented for maximum posterior probability (MPP) demodulation of angle-modulated signals. A sampled data version of the problem is considered, in which additive Gaussian noise and Gaussian modulating signal are assumed. The algorithm is a numerical method for solving the nonlinear equations which are necessary conditions for MPP estimation. Results of a simulation of the algorithm... View full abstract»

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  • Digital Communication Systems in Impulsive Atmospheric Radio Noise

    Publication Year: 1979, Page(s):228 - 236
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1667 KB)

    Analyses are presented of the performance of binary and M-ary coherent and noncoherent communication systems operating in the impulsive atmospheric radio noise environment. The receiver is usually a maximum likelihood detector for white Gaussian interference and therefore has the form of a parallel bank of matched filters followed by decision circuitry. By employing a Poisson or generalized Shot n... View full abstract»

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  • A Kalman Filter Based Tracking Scheme with Input Estimation

    Publication Year: 1979, Page(s):237 - 244
    Cited by:  Papers (208)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1610 KB)

    Beginning with the derivation of a least squares estimator that yields an estimate of the acceleration input vector, this paper first develops a detector for sensing target maneuvers and then develops the combination of the estimator, detector, and a "simple" Kalman filter to form a tracker for maneuvering targets. Finally, some simulation results are presented. A relationship between the actual r... View full abstract»

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  • Reconstructed Flight Control Sensor Signals Via Luenberger Observers

    Publication Year: 1979, Page(s):245 - 252
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1824 KB)

    The feasibility of providing flight control systems with software-managed redundancy is investigated. It is shown that sufficient information can be extracted from aircraft attitude sensors to allow analytic reconstruction of the stability augmentation system (SAS) sensor signals in the event of SAS sensor failures. The sensor signal reconstruction is performed in a deterministic setting by using ... View full abstract»

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  • Simultaneous Detection., and Intensity Estimation of an Optical Image

    Publication Year: 1979, Page(s):253 - 259
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1428 KB)

    A statistical model for simultaneous detection and single parameter estimation of a stochastic signal against background noise is obtained. Two strategies, Bayes and maximum likelihood, are discussed. The detection of an optical point source imaged on a photosensitive surface and the estimation of its intensity based on such strategies are examined. An almost optimum estimate is also proposed and ... View full abstract»

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  • Noise Suppression Characteristics of a dc-to-dc Converter

    Publication Year: 1979, Page(s):260 - 266
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1365 KB)

    Analytical and experimental considerations of the noise suppression characteristics of a typical dc-to-dc converter with a two-winding reactor are described. The high-frequency equivalent circuits for external noise are presented which are composed of parasitic parameters and have parallel and series resonances. The high-frequency responses calculated from these equivalent circuits agree well with... View full abstract»

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  • Design of Weighting Functions Under Peak Amplitude and Effective Radiated Voltage Constraints

    Publication Year: 1979, Page(s):267 - 274
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1221 KB)

    The problem of designing optimum weighting functions subject to peak amplitude and effective radiated voltage constraints occurs in the design of active phased arrays and in spectrum control of high-pulse-repetition frequency (PRF) pulsed Doppler transmitters. Algorithms for generating such weighting functions are developed using a least-squares technique. Numerical results are presented which sho... View full abstract»

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  • Eliminating False Lock in Phase-Locked Loops

    Publication Year: 1979, Page(s):275 - 281
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1021 KB)

    A model is developed for phase-locked loops incorporating phasefrequency detectors. This model facilitates analysis of the loop and enables us to derive the conditions for false lock. It is shown by analysis that phase-locked loops with phase-frequency detectors are indeed capable of false lock; this theoretical result is verified by experimental results. A method for eliminating false lock is the... View full abstract»

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  • Velocity Estimation from Position Outputs of a Three-Dimensional Radar

    Publication Year: 1979, Page(s):281 - 284
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (591 KB)

    Kalman filtering equations to obtain estimates of velocity from radar position information are defined. In a track-while-scan operation, a three-dimensional radar sensor measures range, bearing, and elevation (r, θ, ø) of an airborne target at uniform sampling intervals of time T. The noisy position measurements are converted to x, y, z coordinates and put through a Kalman filter to o... View full abstract»

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  • Heading and Speed Errors for x, y Tracking Filters

    Publication Year: 1979, Page(s):284 - 287
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    Heading and speed errors are analytically determined for noneumavering targets at the output of an x, y tracking filter which processes range and bearing measurements from a radar sensor in a track-while-scan (TWS) operation. These errors are shown to depend upon target range and speed, the angle between the radius and velocity vectors, sensor accuracies, and tracking filter parameters. eters. Dep... View full abstract»

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  • Probability Density of the Maximum Likelihood Elevation Estimate of Radar Targets

    Publication Year: 1979, Page(s):288 - 290
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB)

    The probability density of the maximum likelihood estimate of elevation angle of a radar target in the presence of multipath is calculated. For detectable signals that have low signal-to-noise ratios, the density is a mixture of a Gaussian density and a delta function at the horizon. View full abstract»

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  • Comments on "The GYROLITE: A New Generation Synchronous Satellite"

    Publication Year: 1979, Page(s):290 - 292
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (607 KB)

    The effectiveness of the GYROLITE attitude stabilization is discussed on the basis of the basic mathematical equations in [1], and an avenue towards improved performance is indicated. View full abstract»

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  • Maximum Likelihood Energy Detection of Mary Orthogonal Signals

    Publication Year: 1979, Page(s):292 - 299
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1158 KB)

    The literature on energy detection is extended by applying it to the processing of M'ary orthogonal communication signals of arbitrary time-bandwidth product. Guassian noise channel transition probabilities are derived for maximum likelihood energy detection, modified to the extent of including an erasure threshold. Relations and computational techniques are described for determining the symbol er... View full abstract»

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  • Combining the Effects of Rain-Induced Attenuation and Depolarization in Digital Satellite Systems

    Publication Year: 1979, Page(s):299 - 300
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (338 KB)

    Rain depolarization causes crosstalk on a dual polarization communications link. The effects of depolarization can be expressed as a degradation of the carrier-to-noise ratio (CNR) which can then be combined with the rain-induced attenuation to yield an effective attenuation. The effective attenuation is computed for a hypothetical satellite link at 11, 14, 20, and 30 GHz. It is shown that at 20/ ... View full abstract»

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  • Correction to "Tools of Kinematics: A Crital Review"

    Publication Year: 1979, Page(s): 301
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  • Correction to "The Effect of MTI Filter and Number of Unique Staggers on First-Null Depth and Clutter Attenuation"

    Publication Year: 1979, Page(s): 301
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  • Correction to "Design and Evaluation of an Adaptive MTI Filter"

    Publication Year: 1979, Page(s): 301
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  • Correction to "Graphical Analysis of a Digital Phase-Locked Loop"

    Publication Year: 1979, Page(s): 301
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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