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IEEE Transactions on Aerospace and Electronic Systems

Volume AES-8 Issue 5 • Sept. 1972

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Displaying Results 1 - 25 of 31
  • Table of contents

    Publication Year: 1972, Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Group

    Publication Year: 1972, Page(s):c2 - 710b
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  • From the Editors

    Publication Year: 1972, Page(s): 575
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  • Atomic Power: Fallacies and Facts

    Publication Year: 1972, Page(s):576 - 582
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2245 KB)

    The first demonstration of atomic fission occurred in a laboratory thirty years ago (December 2, 1942). The first electricity from an experimental atomic power plant in the United States was produced fifteen years ago (December 18, 1957). Less than a dozen atomic power plants of significant size have been completed and started operating within the past five years; their brief record of operating e... View full abstract»

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  • Satellite Charges for a Mixed Pre-Demand-Assigned System

    Publication Year: 1972, Page(s):583 - 590
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1863 KB)

    The problems of satellite charges with reduced G/T stations for different pre-assigned and demand-assigned modes of operation are considered. A mixed pre-assigned demand-assigned operation is assumed as a model, in which large standard stations use the demand-assigned system for their overflow traffic. Determination of the optimum percentage of overflow for each link and of the global satellite re... View full abstract»

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  • Pulse Doppler Ambiguity Resolution

    Publication Year: 1972, Page(s):591 - 595
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (753 KB)

    A mathematical algorithm using the method of invariant imbedding is developed which generates a best £2 estimate of range and range rate from pulse Doppler data. View full abstract»

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  • FM Threshold Performance of the Frequency Demodulator with Feedback

    Publication Year: 1972, Page(s):596 - 601
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1600 KB)

    The FM threshold performance of the frequency demodulator with feedback (FMFB) is experimentally optimized. Rules of thumb for the practical design of the FMFB with limiter in the loop are proposed. Such design rules provide for optimum FMFB threshold performance given specifications of the received signal. Equivalences among the FMFB, phase-locked loop, and limiter- discriminator offer some addit... View full abstract»

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  • Identification of Rotating Assembly Inertial and Bearing Parameters

    Publication Year: 1972, Page(s):602 - 608
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1437 KB)

    The problem of estimating the state of a turbopump rotating assembly and identifying unknown products of inertia and unknown bearing parameters is considered. A linearized, extended Kalman filtering approach has been used and found to be successful for both state estimation and parameter identification in an inherently nonlinear problem. The input data was simulated Bently test data which was obta... View full abstract»

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  • Error Probability for NCFSK with Linear FM Jamming

    Publication Year: 1972, Page(s):609 - 614
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1111 KB)

    An expression is derived for the probability of error for a conventional binary, noncoherent, frequency-shift-key (NCFSK) communications system under the influence of bandpass Gaussian noise and a linear frequency-modulation jamming waveform. The resulting integral is expressed in terms of the well-known Q function, which depends upon average signal, noise, and jamming powers. The analytical proce... View full abstract»

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  • On Higher Order Discrete Phase-Locked Loops

    Publication Year: 1972, Page(s):615 - 623
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1747 KB)

    An exact mathematical model is developed for a discrete loop of a general order particularly suitable for digital computation. The deterministic response of the loop to the phase step and the frequency step is investigated. The design of the digital filter for the second-order loop is considered. Use is made of the incremental phase plane to study the phase error behavior of the loop. The model of... View full abstract»

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  • Real-Time Motion Desmearing of Airborne Imagery

    Publication Year: 1972, Page(s):624 - 632
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2355 KB)

    This paper considers the real-time "desmearing" of motion- "smeared" imagery telemetered from an airborne platform. The specific configuration considered is the direct raster scan readout of a satellite-mounted vidicon. Three types of smearing are considered: 1) linear uniform smearing, 2) linear nonuniform smearing, and 3) nonlinear smearing. The simplest type of smearing, linear uniform, has as ... View full abstract»

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  • Signal Resolution via Digital Inverse Filtering

    Publication Year: 1972, Page(s):633 - 640
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1885 KB)

    Research in numerous areas is directed toward the resolution of multiple overlapping signals in a noisy environment. These areas include radar, sonar, speech, seismology, and electrophysiology. Sometimes matched filters are used; other times inverse filters are employed. This paper discusses one approach to the analysis of the resolution of inverse filters. Our method is to compromise the trade-of... View full abstract»

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  • Optimum and Suboptimum Synchronizer for Binary FSK Communication Systems

    Publication Year: 1972, Page(s):641 - 647
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1341 KB)

    This paper considers a binary frequency-shift-keying (FSK) communication system with an adaptive receiver. Partially coherent detection is accomplished exploiting phase and bit synchronization directly extracted from the information-bearing waveform. The optimum (maximum a posteriori probability criterion) estimators of the relevant channel parameters are found along with some suboptimum realizati... View full abstract»

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  • Detection Performance of the Cell Averaging LOG/CFAR Receiver

    Publication Year: 1972, Page(s):648 - 652
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1226 KB)

    The cell averaging LOG/CFAR receiver is a special implementation of a constant-false-alarm-rate (CFAR) receiver in which the noise level estimate is derived from a set of contiguous time samples of the output of a logarithmic (LOG) detector as obtained from a tapped delay line. This CFAR receiver is capable of operating over a larger dynamic range of noise levels than a conventional cell averaging... View full abstract»

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  • Effects of a Finite-Width Decision Threshold on Binary CPSK and FSK Communication Systems

    Publication Year: 1972, Page(s):653 - 660
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1445 KB)

    The function of the receiver in a binary digital communication system is to make a binary ("space", "mark" or ""0", "1") decision by comparing the signal values from the mark and space filters (or correlators) at known successive time intervals ("bit" or "baud" time intervals). When the signal value out of the mark filter is greater than that out of the space filter, it is decided that mark or 1 i... View full abstract»

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  • The Uncertainty of Pulse Position Due to Noise

    Publication Year: 1972, Page(s):661 - 668
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1726 KB)

    The time at which a received signal crosses a certain level fluctuates in the presence of noise. In this paper, a theoretical formula for the standard deviation of this thresholding time is obtained. The formula is applied to the detection of a pulse perturbed by Gaussian noise. Two practical detection schemes, the peak amplitude estimator and the double differentiator, are theoretically analyzed ... View full abstract»

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  • A Mathematical Analysis of the Problem of Pointing

    Publication Year: 1972, Page(s):669 - 675
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1654 KB)

    This paper contains a mathematical analysis of the problem of automatically pointing a sighting device, mounted on a moving vehicle, at a fixed target. The results apply to situations such as automatic sighting devices for aircraft and helicopters, automatic camera aiming for airborne photography, etc. Basic mathematical relations, which govern all forms of such automatic pointing devices, are der... View full abstract»

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  • An Approach to Fixed-Point Smoothing Problems

    Publication Year: 1972, Page(s):676 - 682
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1653 KB)

    This paper examines the possibility of deriving fixed-point smoothing algorithms through exploitation of the known solutions of a higher dimensional filtering problem. It is shown that a simple state augmentation serves to imbed the given n-dimensional smoothing problem into a 2n-dimensional filtering problem. It is further shown that computation of the smoothed estimate and the corresponding erro... View full abstract»

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  • Computer Program Revenue and Cost

    Publication Year: 1972, Page(s):683 - 685
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    First Page of the Article
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  • An Improvement to an Algorithm for Computing Aircraft Reference Altitude

    Publication Year: 1972, Page(s):685 - 687
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (427 KB)

    A recently developed algorithm which is being used to compute an aircraft reference altitude from air data inputs is accurate in a stationary column of air. However, pressure gradients in the atmosphere can introduce significant errors. An improvement (which corrects for pressure gradient errors) has been developed which is based on the equilibrium equation for the motion of the air mass in the pr... View full abstract»

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  • Application of the Spatial Spectral Power Density to the Calculation of Resolution Limits

    Publication Year: 1972, Page(s):687 - 690
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (554 KB)

    Resolution as a function of aperture length in the presence of phase errors is investigated with the aid of the spatial power spectral density. Numerical calculations are made for power spectra thought to be appropriate for phase errors due to atmospheric turbulence. Both Gaussian and uniform illumination are considered, and the results obtained here are compared with those reported by Brown and R... View full abstract»

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  • Equivalence of the Likelihood Ratio Processor, the Maximum Signal-to-Noise Ratio Filter, and the Wiener Filter

    Publication Year: 1972, Page(s):690 - 692
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    It is shown that for the problem of detecting a nonfluctuating target in Gaussian noise, three common optimality criteria lead to identical multichannel filter designs. View full abstract»

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  • Orthogonalization of a Direction Cosine Matrix by Iterative Techniques

    Publication Year: 1972, Page(s):692 - 694
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    It is shown that the ¿first inversion, transposition, and averaging¿ technique [1] is, assuming convergence, quadratically convergent, since it can be developed very simply by the use of quasilinearization. Only the three-dimensional case is considered; the art of matrix orthogonalization is practiced in more general settings [2] than considered here. View full abstract»

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  • Correction to "Report on the Geneva Space Telecommunications Conference-Broadcasting Aspects"

    Publication Year: 1972, Page(s): 694
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  • Testimony before the Federal Communications Commission, May 2, 1972

    Publication Year: 1972, Page(s):695 - 696
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    Freely Available from IEEE

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