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IEEE Transactions on Aerospace and Electronic Systems

Issue 5 • Date Sept. 1973

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Displaying Results 1 - 25 of 36
  • Table of contents

    Publication Year: 1973, Page(s):c1 - 835-b
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1973, Page(s):c2 - 835b
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  • From the Editors

    Publication Year: 1973, Page(s): 629
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  • Radar Imagery of Oil Slicks

    Publication Year: 1973, Page(s):630 - 636
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4300 KB)

    A joint agency controlled oil slick experiment, sponsored by the United States Coast Guard, was conducted in the Pacific Ocean in the Fall of 1970. The Naval Research Laboratory's synthetic aperature radar was used to detect and monitor the slicks at frequencies of 428, 1228, 4455, and 8910 MHz during the low sea state conditions encountered. At frequencies of 1228 MHz and higher, the slicks were ... View full abstract»

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  • On the Effective Single Trial Probability of Success

    Publication Year: 1973, Page(s):637 - 642
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1375 KB)

    Define the cumulative probability Pn of occurence of some event as the probability that it occurs at least once in n trials. If the single trial probabilities are not fixed, but are drawn from a distribution of their own, or are dependent on some other nonfixed variable, then it would be convenient to have an ¿effective single trial probability (esp)¿ for use in the simple Bernoulli model which ... View full abstract»

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  • On the Passive Resolution of Broadcasting Targets with a Monopulse Antenna

    Publication Year: 1973, Page(s):643 - 648
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1292 KB)

    This paper indicates a basic constraint on angular resolution of targets using monopulse measurements. The specific case at hand is the angular resolution of several broadcasting targets by a passive, standard, four-horn amplitude monopulse system. It is shown that when all broadcasting targets emit spectrally equivalent wide-sense stationary signals and the antenna and target geometry are fixed, ... View full abstract»

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  • Angular Accuracy of a Scanning Radar Employing a Two-Pole Filter

    Publication Year: 1973, Page(s):649 - 653
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    A two-pole filter is proposed as a detector for a scanning radar. The optimum values of the filter coefficients are found and are approximated by a simple expression. The optimum two-pole filter requires a 0.15-dB increase in signal-to-noise ratio in order to provide the same detection capability as the optimum detector, and yields azimuth estimates whose standard deviation are within 15 percent o... View full abstract»

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  • Further Results on Multipath Angle Error Reduction Using Multiple-Target Methods

    Publication Year: 1973, Page(s):654 - 659
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1686 KB)

    The two-target technique proposed by the author in an earlier paper [1] for reducing radar multipath angle tracking errors has been simulated on a digital computer assuming an actual closed-loop system. When tracking with noise, the technique provides angle error performance which compares quite favorably with the expected performance given in [1] Furthermore, the large bias errors usually encount... View full abstract»

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  • A UHF True Logarithmic IF Amplifier

    Publication Year: 1973, Page(s):660 - 664
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2573 KB)

    A UHF ¿true logarithmic IF¿ which yields a carrier output proportional in amplitude to the logarithm of the carrier input has been constructed. Although this ¿true¿ form has been known for a number of years, it appears to have been neglected in development. Good performance has been obtained over a 60-dB input signal range with rise and fall times of 2 ns per 20 dB. A high-level, detected dc c... View full abstract»

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  • Average Correlation Functions in On-Line Testing of Linear Systems

    Publication Year: 1973, Page(s):665 - 669
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1260 KB)

    This paper is a report on new methods for on-line testing of single-input/single-output linear and time-invariant systems. No interruption of system operation is necessary, since the signals used in this test procedure are the normal operating signals. Test results indicate that detectable system errors using finite amounts of data are well within tolerance for normal operation in all but the most... View full abstract»

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  • Stabilized Linear FM Generator

    Publication Year: 1973, Page(s):670 - 678
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1971 KB)

    A technique for generating high-linearity chirp (linear FM) signals is presented. It uses a delay line and mixer to sense the slope of the output of a swept oscillator, and the difference from desired slope is fed back to correct the oscillator frequency. The technique also improves the coherence of the oscillator. An analysis is performed of the amount of linearization that can be achieved for th... View full abstract»

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  • Design of Optimal Radar Signals Subject to a Fixed Amplitude Constraint

    Publication Year: 1973, Page(s):679 - 687
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2371 KB)

    The problem of designing finite-pulse-train radar signals and receivers to maximize the detectability of targets masked by thermal noise and clutter returns is considered in this paper. A practical constraint is introduced: the amplitude of each subpulse in the transmit waveform is taken to be fixed. The need for such a constraint is dictated in most radar applications, because the transmitter is ... View full abstract»

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  • Active Nutation Damping Utilizing Spacecraft Mass Properties

    Publication Year: 1973, Page(s):688 - 693
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1399 KB)

    Active nutation damping generally requires a unique element to provide the necessary damping torques, plus a nutation-sensing system to properly monitor and control the active element by closed-loop action. This paper describes and analyzes, by computer- assisted mathematical techniques, a nutation damper for a dual-spin spacecraft which does not require an active ¿element¿. Damping is achieved ... View full abstract»

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  • Simplified Optimum Modulation Indices

    Publication Year: 1973, Page(s):694 - 700
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1953 KB)

    The design of a narrowband, phase-modulated, multisubcarrier, phase-coherent, space-communication system requires that the subcarrier modulation indices be kept within close tolerance limits. This need arises since the modulation indices directly affect the division of power among the carrier and subcarriers. If the system is not designed in an optimum manner to handle large tolerance variation, t... View full abstract»

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  • Optimum Signal and Filter Design in Underwater Acoustic Echo Ranging Systems

    Publication Year: 1973, Page(s):701 - 713
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2655 KB)

    Optimization of the filter, the signal, and the signal and filter jointly are studied in the sonar environment under noise and reverberation limited conditions. The maximization of the receiver output signal-to-interference ratio is used as a performance criterion with unit energy constraint on both signal and filter. In the filter design problem, the optimum filter function is the solution of a l... View full abstract»

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  • Elimination of Blind Velocities of MTI Radar by Modulating the Interpulse Period

    Publication Year: 1973, Page(s):714 - 724
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1992 KB)

    The performance of a coherent MTI is determined by two sets of parameters: the interpulse periods and the weighting coefficients. The latter are expressed in terms of the former so as to maximize clutter attenuation. Interpulse periods are optimized so as to remove blind velocities. The many local optima of the interpulse periods have improvement factors that show differences of up to 6 dB for a 5... View full abstract»

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  • Analysis of a Long-Distance System Measuring the Concentration of Atmospheric Gaseous Pollutants

    Publication Year: 1973, Page(s):725 - 731
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1433 KB)

    A detailed inaccuracy and sensitivity analysis of a long-distance air pollution detection system, using a laser measuring the resonance absorption of polluting molecules, is introduced. The noise and the dynamic range of the radiation detectors used, the atmospheric inhomogeneities, and the atmospheric propagation losses of the electromagnetic radiation are considered. In addition, the best measur... View full abstract»

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  • Synthetic Aperture Radar System Design for Random Field Classification

    Publication Year: 1973, Page(s):732 - 740
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1783 KB)

    The optimum design of synthetic aperture radar (SAR) systems intended to classify randomly reflecting areas, such as agricultural fields, characterized by a reflectivity density spectral density is studied. Assuming areas of known shape and location, the binary case, and a certain Gaussian signal field property, and ignoring interfield interference, the problem solution is given. The optimum proce... View full abstract»

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  • Effects of Geodetic Uncertainties on a Damped Inertial Navigation System

    Publication Year: 1973, Page(s):741 - 752
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2561 KB)

    Gravity uncertainties are an inexorable source of error in all inertial navigation systems and are particularly important in high-quality inertial navigation systems. In this paper the steady-state rms errors that are excited in a damped inertial navigation system are analytically determined for four gravity uncertainty models and two vehicle maneuver models. The statistical approach used in this ... View full abstract»

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  • Distortion Generated in Angle-Modulation Systems by Phased Arrays

    Publication Year: 1973, Page(s):753 - 757
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1528 KB)

    The case of linear, uniformly weighted phased arrays is examined via time and frequency domain analyses. Bounds that must be placed on array length, modulation frequency, modulation index ¿¿, and scan angle relationships if excessive distortion is to be avoided in wideband angle-modulated communication systems are established. Distortion is shown to consist of odd harmonic terms. It is also shown ... View full abstract»

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  • Effects of Navigation Errors in Maneuvering SAR

    Publication Year: 1973, Page(s):758 - 776
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3306 KB)

    A maneuvering synthetic aperture radar in squint mode, during a loosely piloted maneuver, is simulated with presence of various navigation system errors. The error sources investigated place emphasis on short-term effects, involving platform servo transients, noise and quantization in accelerometers, interaction of angle pickoff uncertainty with the displacement from platform to radar antenna, and... View full abstract»

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  • Comment on "Atomic Power: Fallacies and Facts"

    Publication Year: 1973, Page(s):777 - 778
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  • Choice of Burst Number for Blind-Speed Avoidance

    Publication Year: 1973, Page(s):778 - 781
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (877 KB)

    A common problem in radar system design is the choice of multiple PRF's to eliminate the blind speeds associated with coherent pulse bursts with uniform pulse spacing. This correspondence describes the procedure of selecting a set of PRF's in such a manner that the unambiguous Doppler achievable with the entire set is maximized. Based on this optimization of the set of PRF's, we determine how many... View full abstract»

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  • Closed-Form Expressions for Noncoherent Radar Integration Gain and Collapsing Loss

    Publication Year: 1973, Page(s):781 - 783
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    Closed-form formulas allow rapid determination of noncoherent integration gain and integration loss when the single-sample IF signal-to-noise ratio (SNR) is known. In addition, if the required SNR is known for any number of integrated pulses, the required SNR for any other number is easily determined. A closed-form expression is given for radar collapsing loss, expressed in terms of the equivalent... View full abstract»

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  • Steady-State Noise Reduction Factors for the Exponential Filter

    Publication Year: 1973, Page(s):783 - 785
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    A technique is presented using state notation for deriving the steady-state noise reduction factors for an exponential filter. The technique is carried through to derive those factors for the third-order exponential filter. 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