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IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • July 1975

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Displaying Results 1 - 25 of 49
  • Table of contents

    Publication Year: 1975, Page(s):c1 - 692-b
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1975, Page(s):c2 - 692a
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  • From the Editors

    Publication Year: 1975, Page(s): 429
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  • A Stochastic Algorithm for Sensitivity Analysis

    Publication Year: 1975, Page(s):430 - 436
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1895 KB)

    A direct stochastic sensitivity analysis algorithm is developed for linear dynamical systems having incompletely known input statistics. The new algorithm extends previous results by applying covariance propagation concepts which utilize as a forcing function the sensitivity covariance matrix associated with the uncertainty in the elements of the system input covariance matrix itself. The develope... View full abstract»

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  • Modified Barker Code Approximating Huffman's Impulse-Equivalent Sequence

    Publication Year: 1975, Page(s):437 - 442
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1130 KB)

    It is shown by use of D.A. Huffman's polynomial representation for a finite sequence of contiguous pulses in a pulse train that Barker's binary-coded sequences can be modified, by a weighting of pulse amplitudes, to a condition where time sidelobes in the pulse compressed signal are substantially reduced. In such a pulse amplitude modification there is a sacrifice in pulse train energy since each ... View full abstract»

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  • An Optimal Normalization Scheme

    Publication Year: 1975, Page(s):443 - 446
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB)

    An attitude normalization scheme, based on quaternion updates' of the attitude matrix in a strapdown system, is presented which is optimal in the two-norm sense. Furthermore, the algorithm requires minimal computer time and memory load. View full abstract»

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  • A Comparison of Two Approaches to Pure-Inertial and Doppler-Inertial Error Analysis

    Publication Year: 1975, Page(s):447 - 455
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1312 KB)

    Error equations for inertial navigation systems are derived using a perturbation (or true frame) approach and a psi angle (or computer frame) approach in a manner which shows the underlying as sumptions and allows direct comparison of the two methods. The comparison is general since the analysis is not associated with any particular mechanization. Different definitions of velocity errors and misal... View full abstract»

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  • On-Line, Real-Time Recognition System on Telegraph Codes: TETAC

    Publication Year: 1975, Page(s):456 - 464
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1889 KB)

    This paper describes studies of the TETAC system (Teaching Equipment for Telegraph Technology Aided by Computer). The system has been developed for training students at the University of Electro-Communications. TETAC is an intelligent system which recognizes Morse code sent by hand and converts it to letters by means of online and real-time processing. In addition, the system evaluates the qualiti... View full abstract»

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  • Detecting Instrument Malfunctions in Control Systems

    Publication Year: 1975, Page(s):465 - 473
    Cited by:  Papers (112)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1333 KB)

    A scheme for automatically detecting incipient failures in the feedback sensors (or instruments) of control systems is described. The feasibility of the scheme is investigated by applying it to a simplified version (fourth order) of the flight control system for a hydrofoil boat. A single set of inertial instruments is used to provide the feedback signals; the redundancy which is normally obtained... View full abstract»

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  • The Effects of Defruiting on the ATCRBS

    Publication Year: 1975, Page(s):474 - 484
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2289 KB)

    The defruiter that is employed in the Air Traffic Control Radar Beacon System (ATCRBS) to prefilter asynchronous replies has a complex impact on the detection, estimation and validation properties of the detection subsystem. Its positive and negative effects are quantitatively enumerated via a simulation of the beacon processing subsystem of the Automated Radar Terminal System (ARTS III). It is co... View full abstract»

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  • ATC Beacon Interference Characteristics in the New York Area

    Publication Year: 1975, Page(s):485 - 494
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3551 KB)

    An experimental program is described that had the objective of measuring the effects of the time-dependent structure of downlink (air craft to ground) interference generated by the Air Traffic Control Radar Beacon System (ATCRBS) in an active air traffic terminal area that are relevant to system and ground controller response time. The results of this program indicate a number of interesting detai... View full abstract»

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  • Circuit Analysis of Eddy Currents

    Publication Year: 1975, Page(s):495 - 498
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (769 KB)

    Maxwell's equations govern the eddy-current phenomenon, and are the starting point of this analysis. It is shown that Maxwell's equations, as applied to steady-state ac conditions, can be transformed to a Fredholm-type integral equation in eddy-current density. In turn, it is demonstrated that the method of subareas can be used to solve the Fredholm equation. This approach leads to the familiar ci... View full abstract»

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  • Review of Radiation Damage to Silicon Solar Cells

    Publication Year: 1975, Page(s):499 - 513
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3459 KB)

    This paper reviews a large number of silicon solar cell irradiation experiments performed over the last 10 years, including 1-MeV and energy spectrum electron studies, and low-(100-keV) and high-energy (up to 155-MeV) proton studies on bare and covered silicon solar cells of several types. The results of satellite flight experiments on individual solar cells are also presented, as well as data fro... View full abstract»

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  • Limiting the Impulsive Noise in a PLL

    Publication Year: 1975, Page(s):514 - 518
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    This paper analyzes the operation of a phase-locked loop (PLL) preceded by a bandpass limiter (BPL) in the presence of impulsive noise. It is shown that the effect of the limiter consists essentially in a change of the statistics of the pulse strengths of the noise, so that the behavior of a BPL + PLL can be deduced from that of a simple PLL by suitable adjustment of the noise model. It is found t... View full abstract»

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  • Doppler Processor Rejection of Range Ambiguous Clutter

    Publication Year: 1975, Page(s):519 - 522
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (835 KB)

    Doppler processors are used in radar to separate target returns from clutter. When the clutter is at a range farther than the unambiguous range of the radar, the ability to reject the clutter is degraded. In this article the degradation is analyzed for an N-pulse batch processor with Dolph weighting, and the results show how degradation varies with design sidelobe level. View full abstract»

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  • The Jet Fighter Radar Cross Section

    Publication Year: 1975, Page(s):523 - 533
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2895 KB)

    Two jet fighter models, 1/8th of original size, have been measured in the "radar range" installed in the anechoic chamber of the Armament Technology and Procurement Group in Berne. The measurements have been made at a frequency of 40 GHz (5 GHz for full scale), with an accuracy of ± 2 dB and a dynamic range of 80 dB. The statistical distribution of the radar cross section has been calculated with... View full abstract»

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  • Estimating Target Lengths Shorter Than the Radar Pulse Width

    Publication Year: 1975, Page(s):534 - 538
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1328 KB)

    This paper discusses the performance and sensitivity of a maximum-likelihood length estimation algorithm which was originally developed to estimate the separation between unresolved point scatterers. It shows that when the two-scatterer target model is valid, the algorithm reliably estimates lengths shorter than the Rayleigh limit provided that the strength of no third interior scatterer (or its e... View full abstract»

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  • Boresight Corection Using Unlocated Targets

    Publication Year: 1975, Page(s):539 - 542
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (810 KB)

    Boresight correction on detected but unlocated targets may be made if a bearing (whose error is unknown) is repeated on two seeker headings and another bearing is repeated on two seeker headings, or if bearing is repeated on three seeker headings. The assumption is made that seeker position and heading are known. The procedure is effective either with the above or with the combination of restricte... View full abstract»

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  • Generation Schemes for Wind Power Plants

    Publication Year: 1975, Page(s):543 - 550
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1626 KB)

    This paper reviews various electric generation schemes for wind energy conversion suitable for interconnection with a power grid. The schemes can be generally classified as constant speed constant frequency (CSCF) and variable speed constant frequency (VSCF) systems. Historically, only CSCF systems have been used for large power generation in wind power plants. However, with the advent of power el... View full abstract»

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  • Estimating Angular Velocity from Output of Rate-integrating Gyro

    Publication Year: 1975, Page(s):551 - 555
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (766 KB)

    The Kalman filtering technique can be used to improve estimates of angular velocity (in a strapped-down navigation system) using angular increment (rate integral) data. A simple, second-order, constant coefficient digital filter can yield significant improvement for a very high or a very low noise-to-signal ratio·r = 4 ¿¿/¿¿T2, where ¿¿ is the rms noise in measuring angular increments, ¿¿... View full abstract»

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  • Hard Limiting in Synthetic Aperture Signal Processing

    Publication Year: 1975, Page(s):556 - 561
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1618 KB)

    In synthetic aperture radar a large linear phased array is formed from the rapid movement of a single element through each position in the array. Storage and coherent combining of the successive radar echoes are central to the array-forming process. Optical processing is the most common technique because of the efficiency with which Fourier transformation may be accomplished with simple optics. Re... View full abstract»

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  • Advances in Low-Frequency Radio Navigation Methods

    Publication Year: 1975, Page(s):562 - 574
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2438 KB)

    Advances in the analysis and design of low-frequency radio navigation systems are presented in four sections detailing system design, propagation, receivers and processors, and error analyses. Emphasis is on the short-baseline case where radial accuracies of 114 feet are possible for non-line-of-sight operation to ranges of 50 miles from transmitters. Possibel future applications for LF include an... View full abstract»

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  • Optimal and Suboptimal Perfomance of a PCM/FM Communication System

    Publication Year: 1975, Page(s):575 - 581
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1098 KB)

    Theoretical results are presented on probability of error in the detection of binary FM signals for various frequency deviations with fixed bit rate, restricted predetection filter bandwidth, ideal limiterdiscriminator reception, and integrate-and-dump postdetection filter decision. The results show that suboptimal system performance can be achieved by choosing the largest possible value of deviat... View full abstract»

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  • Low-Level Signal Detection Using a New Transform Class

    Publication Year: 1975, Page(s):582 - 594
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1987 KB)

    A system is developed to detect tracks crossing two-dimensional noise fields. This is accomplished by filtering and integration of signal power in the frequency domain of a new class of generalized transforms which include the FFT and FBT as limiting forms. If the track is essentially parallel to a transform axis and if filters are derived from hard-limited linear approximations to tracks, the FBT... View full abstract»

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  • Phase-Locked Demodulator Threshold: A New Approach

    Publication Year: 1975, Page(s):595 - 599
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1069 KB)

    In this paper the dependence of the threshold CNR of a simple phaselocked demodulator on the frequency deviation of an FM signal has been evaluated by the concept of quasi-stationary approximation. Experimental findings have been presented in support of the theoretical conclusion. 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