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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Date March 1973

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Displaying Results 1 - 25 of 35
  • Table of contents

    Publication Year: 1973, Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1973, Page(s):c2 - 348b
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  • From the Editors

    Publication Year: 1973, Page(s): 129
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  • Speech Data Rate Reduction Part I: Applicability of Modern Estimation Theory

    Publication Year: 1973, Page(s):130 - 138
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1335 KB)

    Efficient coding of continuous speech signals for digital representation has attracted much interest in recent years. The underlying aim of efficient coding methods is to reduce the channel capacity required to represent a signal to meet a specific reconstruction fidelity criterion. To achieve this objective, modern speech data compression techniques rely on two very similar procedures. One proced... View full abstract»

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  • Speech Data Rate Reduction Part II: Applicability of Sensitivity and Error Analysis

    Publication Year: 1973, Page(s):139 - 150
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2600 KB)

    This paper deals with the application of modern estimation techniques to the problem of speech data rate reduction. It is desirable to adaptively identify and quantitize the parameters of the speech model. These paramaters cannot be identified and quantized exactly; the performance of the predictor is thereby degraded and this could prevent data reduction. In many cases it is desirable to emply a ... View full abstract»

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  • A Semicoherent Detection and Doppler Estimation Statistic

    Publication Year: 1973, Page(s):151 - 165
    Cited by:  Papers (104)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3038 KB)

    Consider a uniform train of M coherent short pulses transmitted by a radar and received with a Doppler shift. When thermal noise is present, let the mth sample of the return at the video be represented by the complex process Zm. A novel detection and Doppler estimation criterion is analyzed which depends on the semicoherent statistic begin{equation*}{Z_{K}}^prime = sum_{m=k+1}^{M} {^{z}m^{z}m-k}^{... View full abstract»

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  • Synthetic Aperture Processing with Limited Storage and Presumming

    Publication Year: 1973, Page(s):166 - 176
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1951 KB)

    The number of transmitted pulses associated with the Doppler histories of a side-looking radar may greatly exceed the desired azimuth compression ratio of the system. This discrepancy is taxing if the storage required for the azimuth processing is provided by cores, magnetic drums, and the like. Thus, as a practical matter, one considers presumming of the data prior to correlation in an attempt to... View full abstract»

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  • Construction of Fuel and Oil Quantity Sensors for High-Performance Aircraft

    Publication Year: 1973, Page(s):177 - 182
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3056 KB)

    This paper describes the materials and methods of construction of fuel and oil quantity sensors designed to be used in the severe environments of todays high-performance aircraft. The sensors are based on the use of magnetically activated reed switches suitably compensated by resistors. In order to provide physical and electrical protection, the switches and resistors are encapsulated in a fuel an... View full abstract»

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  • A Minimax Filter for Systems with Large Plant Uncertainties Using Measurements Corrupted by Colored Noise

    Publication Year: 1973, Page(s):183 - 186
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1130 KB)

    A minimax filter is derived to estimate the state of a system, using observations corrupted by colored noise, when large uncertainties in the plant dynamics and process noise are present. View full abstract»

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  • On Signal Fluctuations in Tracking Systems

    Publication Year: 1973, Page(s):187 - 196
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1910 KB)

    All tracking systems suffer, to some extent, from signal level fluctuations. The signal fluctuations are modeled by a Gaussian process and the noise performance of both linear and nonlinear first-order tracking systems is considered. In the nonlinear case, the Ito versus Stratonovich calculus difficulty arises, but it is resolved to make sense physically. Several analytical results are obtained wh... View full abstract»

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  • Unsupervised Tracking of Maneuvering Vehicles

    Publication Year: 1973, Page(s):197 - 207
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2259 KB)

    The design of adaptive filters for the tracking of high-performance maneuvering targets is a fundamental problem in real-time surveillance systems. As is well known, a filter which provides heavy smoothing can not accurately track an evasive maneuver, and conversely. Consequently, one is led to the consideration of adaptive methods of filter design. This paper presents an improved self-adaptive fi... View full abstract»

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  • Correlated Clutter and Resultant Properties of Binary Signals

    Publication Year: 1973, Page(s):208 - 213
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1242 KB)

    A simple Markov process model of binary, digitized radar clutter returns is assumed. Probability distributions for the number of hits in n observations are developed for small n with a binary parameter describing the process derived for Rayleigh distributed clutter. Tables of distributions are included, along with an example to show the effects of correlation on the false-alarm probabilities of a ... View full abstract»

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  • Optimum Mismatched Filters for Sidelobe Suppression

    Publication Year: 1973, Page(s):214 - 218
    Cited by:  Papers (124)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    This paper discusses the application of least-mean-squares approximate inverse filtering techniques to radar range sidelobe reduction. The method is illustrated by application to the 13-element Barker code. The performance of the least-mean-square inverse filter is compared with the matched filter and with the simplified sidelobereducing filters of Rihaczek and Golden. A filter which completely su... View full abstract»

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  • Automatic Checkout and Monitoring in the AN TPQ-27 Radar System

    Publication Year: 1973, Page(s):219 - 224
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1354 KB)

    This paper describes automatic monitoring equipment built in to a precision tracking radar system to detect and isolate faults. The purpose of the monitoring equipment is to minimize the mean time to repair faults and to exercise the overall system for pre-mission alignment and calibration. In addition, it is used to periodically check for performance degradation in key areas of the system. The pa... View full abstract»

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  • Overview of the Biological Effects of Electromagnetic Radiation

    Publication Year: 1973, Page(s):225 - 228
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1252 KB)

    A brief review is given of some of the problems concerning the interactions of electromagnetic radiation with biological systems. It is emphasized that we cannot continue to expand the use and power of the electromagnetic spectrum without adequate consideration of its possible biological effects. New research efforts must be started in this area, utilizing a strong and well-coordinated interdiscip... View full abstract»

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  • A Decision - Directed Adaptive Tracker

    Publication Year: 1973, Page(s):229 - 236
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2055 KB)

    In the design of a tracking filter for air traffic control (ATC) applications, a maneuvering aircraft can be modelled by a linear system with random noise accelerations. A Kalman filter tracker, designed on the basis of a variance chosen according to the distribution of the potential maneuver accelerations, will maintain track during maneuvers and provide some improvement in position accuracy. How... View full abstract»

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  • Theory of Adaptive Radar

    Publication Year: 1973, Page(s):237 - 252
    Cited by:  Papers (392)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2750 KB)

    This paper reviews the principles of adaptive radar in which both the spatial (antenna pattern) and temporal (Doppler filter) responses of the system are controlled adaptively. An adaptive system senses the angular-Doppler distribution of the external noise field and adjusts a set of radar parameters for maximum signal-to-interference ratio and optimum detection performance. A gradient technique f... View full abstract»

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  • High-Reliability Strapdown Platforms Using Two-Degree-of-Freedom Gyros

    Publication Year: 1973, Page(s):253 - 259
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1645 KB)

    This paper presents a new concept of high-reliability strapdown attitude sensing systems for space vehicles. Each system utilizes a set of redundant two-degree-of-freedom gyros. An optimum system configuration is obtained for maximum system reliability and the best measurement accuracy. Improved accuracy of the final data is obtained by using the least-square data reduction technique. Each system ... View full abstract»

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  • Application of Adaptive Arrays to Suppress Strong Jammers in the Presence of Weak Signals

    Publication Year: 1973, Page(s):260 - 271
    Cited by:  Papers (58)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2088 KB)

    The purpose of this paper is to demonstrate that an adaptive array can be used to acquire weak signals, whose direction and timing are unknown, in an environment of stronger jammers. Specifically, it is shown that in an environment of one weak signal and one strong jammer, the adaptive array output suppresses the strong jammer below the weak signal by roughly the same amount that the jammer exceed... View full abstract»

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  • The Use of a Spinning Dissipator for Attitude Stabilization of Earth-Orbiting Satellites

    Publication Year: 1973, Page(s):272 - 279
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1362 KB)

    This paper considers a novel attitude stabilizing system which acts both as a passive nutation damper and a momentum source for an Earth-orbiting satellite. The system may be designed to use four identical wheels mounted coaxially with and at the ends of the arms of a cruciform structure. The structure may then be spun about the axis perpendicular to the arms to provide angular momentum along the ... View full abstract»

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  • Optimal Aircraft Go - Around and Flare Maneuvers

    Publication Year: 1973, Page(s):280 - 289
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1933 KB)

    This paper analyzes in detail two of the critical aircraft maneuvers associated with approach and landing: the go-around maneuver and the flare maneuver. Optimal solutions that include state and control variable constraints are obtained for both problems. Two algorithms are given for computation of the minimum and maximum altitude loss associated with the pilot-controlled go-around maneuver. A mat... View full abstract»

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  • Fluctuation Loss and Diversity Gain for In - Phase Systems with Post - Detection Integration

    Publication Year: 1973, Page(s):290 - 295
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1300 KB)

    This paper presents a simple method for determining the losses resulting from detecting only the in-phase component of the complex signal vector returned from a Rayleigh-distributed target. A simple rule is given in terms of the fluctuation loss and integration gain of square-law-detected pulses. The integration improvement for the in-phase channel is given for both slow and fast fluctuating Rayle... View full abstract»

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  • Transmission Lines and the Environment

    Publication Year: 1973, Page(s):296 - 299
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1268 KB)

    The confused and conflicting state of environmental criteria for transmission lines is discussed. The demands thrust upon electric utilities by pressure groups and legislation provide unsatisfactory guidance for environmental considerations. Environmental considerations are necessary for transmision lines, but realistic, flexible rules must be developed to balance protection of the ecology and the... View full abstract»

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  • Calculation of Probability of Detection with Target Scintillation

    Publication Year: 1973, Page(s):300 - 305
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1556 KB)

    This paper presents a computational method for the calculation of probability of detection using measured radar target cross-section data. The described method can also be used for probability of detection calculations when the radar target cross section follows a specified probability density function. Using the computational procedure of the paper, a number of curves are generated which can be u... View full abstract»

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  • Kalman Filter Design Considerations for Space-Stable Inertial Navigation Systems

    Publication Year: 1973, Page(s):306 - 319
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3393 KB)

    Terrestrial inertial navigation is typically performed using an instrumented platform stabilized in a ¿local-level¿ configuration for convenient generation of geographic navigation information. The local-level geographic reference must be maintained by torquing the system gyros, a requirement which may be incompatible with high-precision inertial sensors currently under development. Gyro torquin... 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