IEEE Transactions on Aerospace and Electronic Systems

Issue 6 • Nov. 1973

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Displaying Results 1 - 25 of 37
  • Table of contents

    Publication Year: 1973, Page(s):c1 - 980-30b
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1973, Page(s):c2 - c4
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  • From the Editors

    Publication Year: 1973, Page(s): 837
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  • Propagation and System Accuracy Impact of Major Sensor Errors on a Strapdown Aircraft Navigator

    Publication Year: 1973, Page(s):838 - 846
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1887 KB)

    A strapdown system is considered as an unaided inertial navigator aboard an aircraft. Presented here are simulation results detailing the propagation of navigation errors (in nautical miles) due to strapdown sensor errors for four trajectories. They indicate the type of performance that can be expected from a strapdown system utilizing good "off the shelf" gyros and accelerometers, and dramaticall... View full abstract»

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  • Stability of Parameter Estimates for a Gaussian Process

    Publication Year: 1973, Page(s):847 - 851
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1679 KB)

    Maximum-likelihood estimates for the levels of the mean value function and the covariance function of a Gaussian random process are investigated. The stability of these estimates is examined as the actual covariance function of the process deviates from the form assumed in the estimators. It is found that the time-bandwidth product for stationary processes represents an upper bound on the number o... View full abstract»

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  • Terminal Guidance for Impact Attitude Angle Constrained Flight Trajectories

    Publication Year: 1973, Page(s):852 - 859
    Cited by:  Papers (184)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1539 KB)

    The design of a suboptimal terminal guidance system for reentry vehicles with a constraint on the body attitude angle at impact is studied. Permissible range of the miss distance and the body attitude angle at impact is specified. The problem is formulated as a linear quadratic control problem. The Riccati equation is derived to provide time-varying feedback gains. The desired scheme is suboptimal... View full abstract»

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  • The Effect of Spectral Shape on the Probability of Error in Laser Binary Communication Systems

    Publication Year: 1973, Page(s):860 - 863
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1489 KB)

    The effect of spectral bandwidth and spectral shape upon laser binary communication systems is investigated. The probability of error is plotted as a function of bandwidth for Lorentzian and Gaussian shaped spectra. The results show that even when the average noise power and the signal-to-noise ratio are held constant, the probability of error varies considerably as a function of spectral bandwidt... View full abstract»

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  • Digital Radiometer Performance

    Publication Year: 1973, Page(s):864 - 874
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2124 KB)

    This work investigates the performance of an all-digital, total-power radiometer (TPR), consisting of RF, mixer, and IF stages followed by an analog-to-digital converter (ADC). Square-law detection and smoothing is performed in a digital computer. A figure of merit, the degradation factor, is defined which compares the digital TPR with an ideal analog TPR. Exact results are obtained which include ... View full abstract»

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  • Determination of Horn Antenna Phase Centers by Edge Diffraction Theory

    Publication Year: 1973, Page(s):875 - 882
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2574 KB)

    The edge diffraction method of analysis utilized in the past to determine amplitude patterns is extended in this paper to predict the radiation phase center of pyramidal horn antennas. A series of extensive phase and amplitude measurements were performed on these antennas to determine the validity of the theoretical results. The measurements were performed over a frequency range of 7.5 to 10.5 GHz... View full abstract»

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  • Analysis of Multimodal Systems

    Publication Year: 1973, Page(s):883 - 888
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1802 KB)

    The estimation of a multimodal linear system whose mode-to-mode transitions are described by a finite-state Markov chain is described. The problem has application in studying separation standards in an air traffic control environment. An optimal solution is formulated which is computationally infeasible. A suboptimal estimator is then derived which closely approximates the optimal estimator. An ex... View full abstract»

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  • Specification and Performance of Passive Sonar Spectral Estimators

    Publication Year: 1973, Page(s):889 - 900
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2743 KB)

    The application of existing estimation theory to the problem of specification and performance of passive sonar spectral estimators is considered. The classification function is addressed, so that the signal is assumed to be present, and so that the energy arrival angle is known. The spatial filter considered is a line array of M equally spaced omnidirectional hydrophones. Signal and ambient noise ... View full abstract»

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  • Word Error Rates in Cryptographic Ensembles

    Publication Year: 1973, Page(s):901 - 905
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1302 KB)

    The word error rate of an ensemble of cryptographic systems is determined. The word error rate is specified as a function of the corresponding plain-text bit error rate. Degradation is defined and computed for the case of phase-shift keying and white Gaussian noise. Finally, the effect of differential encoding on a cryptographic system is investigated. View full abstract»

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  • Optimum Steady-State Position and Velocity Estimation Using Noisy Sampled Position Data

    Publication Year: 1973, Page(s):906 - 911
    Cited by:  Papers (60)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1212 KB)

    The Kalman filtering technique is used to obtain analytical expressions for the optimum position and velocity accuracy that can be achieved in a navigation system that measures position at uniform sampling intervals of T seconds through random noise with an rms value of σx. A one-dimensional dynamic model, with piecewise-constant acceleration assumed, is used in the analysis, in which anal... View full abstract»

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  • On the Sensitivity of a Fixed-Point Smoothing Algorithm

    Publication Year: 1973, Page(s):912 - 920
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1594 KB)

    This paper presents a simple approach to the derivation of sensitivity measures of smoothing algorithms. It is proposed that the known sensitivity results of the Kalman filtering algorithm be utilized along with the state augmentation approach for this purpose. The sensitivity measures so obtained are easier to compute than the ones available in the literature. It is then shown that the fixed-poin... View full abstract»

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  • Space Radiation Damage Measurements in the Earth Synchronous Orbit

    Publication Year: 1973, Page(s):921 - 924
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1501 KB)

    For direct measurement of the integrated radiation dose experienced in Earth synchronous orbit, p-i-n diodes were flown as radiation dosimeters on LES-6. The diode, which has a lifetime of 10-4 seconds in the intrinsic region, was originally developed as a neutron dosimeter, but can detect 1-MeV electron fluences as low as 1013 e·cm-2. Observations over three years in orbit are presented. View full abstract»

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  • Damper Bars and Their Influence in Operating Homopolar Inductor Alternators for Aerospace Supplies - Part I: Determination of Saturated Time-Dependent Reactances

    Publication Year: 1973, Page(s):925 - 931
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2020 KB)

    The commutating impedance of homopolar alternators of medium frequency, as described by Trutt and Erdélyi [1], has to be kept at a low value in order to enable the various arrangements made up from solid-state elements to convert frequencies of 3500 Hz to the usual 400 or 60 Hz used in aerospace supplies. This can be achieved by fitting damping devices into homopolar inductor alternators. To stud... View full abstract»

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  • Damper Bars and Their Influence in Operating Homopolar Inductor Alternators for Aerospace Supplies - Part II: Subtransient Reactances of Saturated Homopolar Inductor Alternators with Damper Windings

    Publication Year: 1973, Page(s):932 - 939
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1073 KB)

    The general differential equations for the circuits of a homopolar inductor alternator are established. The system of equations is modified for the case of nonsymmetrical subtransient operation. The Runge-Kutta and Adams-Moulton methods are used to solve the system of differential equations with variable coefficients. The solution is obtained for different initial conditions. Several damper windin... View full abstract»

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  • A Systematic Approach to Blind-Speed Elimination

    Publication Year: 1973, Page(s):940 - 947
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2072 KB)

    In radars that achieve a high subclutter visibility by coherent processing over several pulses, a serious problem appears in the form of blind Dopplers, or "speeds," at which target detection is impossible. Of the possible methods of eliminating these blind speeds, the most basic one that is employed when the performance requirements are high involves the use of several PRF's. These PRF's are chos... View full abstract»

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  • Search Radar Cumulative Probability of Detection

    Publication Year: 1973, Page(s):948 - 950
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (412 KB)

    A procedure is presented for computing radar range performance for different types of radars. It is associated with any arbitrary cumulative probability of detection and false alarm probability for a search radar when scanning uniformly. The emphasis is on presenting a model for engineering use, rather than on its theoretical justification. View full abstract»

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  • The Losses Due to the Error in Estimating the Velocity in Clutter-Locking MTI Systems

    Publication Year: 1973, Page(s):950 - 953
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (594 KB)

    The losses due to the statistical error inherent in estimating the mean clutter velocity by averaging over a limited number of range cells are derived. These results show that an accepted intuitive approach leads to a significant underestimation of the number of range cells required. Suggestions are made for reducing these losses. View full abstract»

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  • Digital Processing of Signal Phase Angle

    Publication Year: 1973, Page(s):953 - 954
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (263 KB)

    The loss of signal-to-noise ratio (SNR) is derived when the magnitude of weak signals in noise is discarded and the phase angle is quantized for digital processing. It is shown that very coarse quantization results in only a small loss. View full abstract»

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  • Polarization Separation by an Adaptive Filter

    Publication Year: 1973, Page(s):954 - 956
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (471 KB)

    The technique of adaptive filtering as applied to the design of a frequency-reuse receiving antenna which can provide optimum isolation from signals of unwanted polarization. View full abstract»

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  • Transient Response of an Asymmetric Cylindrical Antenna

    Publication Year: 1973, Page(s):956 - 959
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1617 KB)

    The time-domain transient response of a thin dipole antenna is discussed in terms of element lengths and the surge impedances of the transmission line and element terminals. Theory and measurements show that, unlike symmetric configurations, asymmetry in the element lengths, together with appropriate mismatch of the transmission line, produces radiation proportional to the first time derivative of... View full abstract»

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  • A New Method of Position Estimation Using Bearing Measurements

    Publication Year: 1973, Page(s):959 - 960
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (337 KB)

    A method of locating radio emitters anywhere on the surface of the Earth, by using bearing measurements, is presented. The method associates planes of bearing with the measured bearings, and characterizes these planes by their unit normals. The emitter is located by finding the unit vector from the Earth's center that minimizes the sum of squares of its inner product with the normal vectors. The s... View full abstract»

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  • Correction to "Now You See It, Now You Don't"

    Publication Year: 1973, Page(s): 960
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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