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Aerospace and Electronic Systems, IEEE Transactions on

Issue 3 • Date May 1982

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Displaying Results 1 - 19 of 19
  • Table of contents

    Publication Year: 1982 , Page(s): c1
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1982
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  • From the Editors

    Publication Year: 1982 , Page(s): 257
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  • Reliability and Availability of Redundant Satellite Orbit Systems

    Publication Year: 1982 , Page(s): 258 - 267
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1622 KB)  

    In order to find the optimum redundant satellite orbit system, the formulas are derived for reliability and availability of redundant systems composed of two parallel, three parallel, one functioning and one standby, and two parallel and one standby satellites, where both the probability of a start or switchover and the necessary delay time for a start or switchover are taken into consideration. The calculation by these formulas shows the relation among the reliability, availability, launch probability, and launch delay time, as illustrated by numerical examples of conventional rockets and space shuttles. View full abstract»

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  • Electric Field Detection and Ranging of Aircraft

    Publication Year: 1982 , Page(s): 268 - 274
    Cited by:  Papers (1)  |  Patents (2)
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    The electric field transported by charged aircraft during free flight can be observed quantitatively in distances of up to some 100 m. A system of three plane sensors arranged in the corners of a triangle or the Earth surface is described, by which the flight path of aircraft is detected in the range of 40 to 500 m with velocities of approximately 50 m/s. The theory and typical experimental results are discussed. View full abstract»

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  • Leaky Coaxial Cable Resource Protection Sensor Performance Analysis

    Publication Year: 1982 , Page(s): 275 - 285
    Cited by:  Papers (1)
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    The performance of an RF intrusion detection system which uses a leaky coaxial cable sensor is analyzed. A simple cable sensor field model is assumed which gives good agreement between the computed response and observation. Expressions that describe the performance of several deployment configurations and receiver types are developed. The probability of detection and the zone of containment are computed and their uniformity is examined as a function of cable propagation constants. View full abstract»

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  • Medium PRF Performance Analysis

    Publication Year: 1982 , Page(s): 286 - 296
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2131 KB)  

    A discussion of various types of x-band airborne radars is presented together with their systematic development through the years to the present time. Starting with simple, low pulse-repetition frequency (PRF) radars for measuring radar-target range, airborne radar development proceeded with more sophisticated high PRF Doppler radars where radar-target range and range rate were measured simultaneously. The use of Doppler (frequency) in signal processing allowed the separation of moving from nonmoving targets (ground), enabling the detection of moving targets in the presence of ground clutter. More recent developments in waveform generation and selection has resulted in the development of medium PRF radars, whereby a greater degree of tactical flexibility in target detection is achieved by combining the desirable features of both low and high PRF radars. Part of the available literature gives an overview, together with a specific example of the design and performance of an airborne medium PRF radar. Here, however, the systematic evolution of these radars is emphasized and the necessary theoretical background is developed for their performance calculations. Modern day airborne radars may be equipped with all three modes of operation, low, medium, and high PRF, allowing the operator to utilize the mode best suited for the tactical encounter. Low PRF and high PRF radars have been described elsewhere and are given here primarily for the sake of completeness and for the necessary background for developing medium PRF radar equations. They are also needed for developing the reasons why medium PRF radars came into being. View full abstract»

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  • The Effect of a Pulsed Interference Signal on an Adaptive Array

    Publication Year: 1982 , Page(s): 297 - 309
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2569 KB)  

    The performance of a least mean square (LMS) adaptive array in the presence of a pulsed interference signal is examined. It is shown that a pulsed interference signal has two effects. First, it causes the array to modulate the desired signal envelope (but not its phase). Second, it causes the array output signal-to-interferenceplus-noise ratio (SINR) to vary with time. The desired signal modulation is evaluated as a function of signal arrival angles, powers and interference pulse-repetition frequency (PRF) and pulsewidth. It is shown that the signal modulation is small except when the interference arrives close to the desired signal. To evaluate the effect of the time-varying SINR, it is assumed that the array is used in a differential phase-shift keyed (DPSK) communication system. It is shown that the SINR variation causes a noticeable but not disastrous increase in the bit error probability. View full abstract»

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  • Instrument Failure Detection in Partially Observable Systems

    Publication Year: 1982 , Page(s): 310 - 317
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1507 KB)  

    Instrument failure detection using the dedicated observer scheme (DOS) depends on partial state observability through each instrument which is monitored. For instrument fault detection by the DOS technique, a quantitative measure of partial state observability is established for each instrument and used to determine a necessary condition on the output structure of the system. This measure, called the internal redundancy of the instrument, indicates the complexity of the logic required for failure detection, and it also indicates where some hardware redundancy can be introduced into the system to improve the fault detection capability of the DOS. The principles developed are applied to a simulation of the pitch axis autopilot of the A7 jet aircraft. View full abstract»

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  • Implementing Aircraft Identification Schemes by Public Key Cryptosystems

    Publication Year: 1982 , Page(s): 318 - 322
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    The use of public key cryptosystems for identification purposes has already been suggested. The practical aspects of using such systems for aircraft identification are discussed. It is shown that the digital signature property is not mandatory for implementing an identification procedure. It is then shown how public key distribution systems can be used for identification purposes. The technical difficulties in implementing an identification scheme are finally discussed with possible solutions offered. View full abstract»

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  • Improved Phase-Locked Loop Performance with Adaptive Phase Comparators

    Publication Year: 1982 , Page(s): 323 - 332
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2982 KB)  

    A major problem in phase-locked loop (PLL) design is to meet the requirements of both fast signal acquisition and good synchronous mode performance. This relation is reviewed for different types of phase comparators. As a result a new phase-and-frequency comparator is proposed. This comparator is based on an up-down counter principle and can be considered as an adaptive acquisition control circuit. The analysis of a PLL with the proposed phase comparator is based on an exact calculation method for the pull-in time. It is shown that fast signal acquisition is possible without affecting the filtering properties of the loop. Experimental results are given of the acquisition behavior of a second-order type-2 loop which show a good correspondence with the theoretical analysis. View full abstract»

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  • Modeling and Design of Switching Regulators

    Publication Year: 1982 , Page(s): 333 - 344
    Cited by:  Papers (19)
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    Various building blocks of a switching regulator are described in detail and mathematical models are developed for all building blocks in terms of transfer functions, which enable one to design a switching regulator for stability, desirable bandwidth, line rejection, and transient response. A step-by-step procedure to design compensation is illustrated using two examples. Various networks for compensation and their transfer functions are presented which the author hopes will be very handy to use and will become the reference source. View full abstract»

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  • Comments on "M-Ary Cpsk Detection with Noisy Reference and Interiverers"

    Publication Year: 1982 , Page(s): 345 - 347
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    The effect of cycle slips of the carrier recovery phase-locked loop (PLL) on the performance of coherent M-ary phase-shift keyed (MPSK) systems is dealt with. It is shown that each cycle slip causes a 1 bit error in a differentially encoded and Gray encoded signal stream. Different situations are investigated and compared with regard to the effect of these errors. View full abstract»

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  • A Logarithmic Frequency Allocation Algorithm for Wideband Discrete Frequency Pulse Trains

    Publication Year: 1982 , Page(s): 347 - 349
    Cited by:  Papers (1)
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    It is shown that signal waveforms utilizing discrete frequency modulation (DFM) which are generated using a narrowband or frequency shift algorithm have ambiguity sidelobe distortion which is caused by the approximation of time compression by frequency shift. A logarithmic frequency allocation algorithm is presented which couches the signal design problem in terms of band and step ratios, rather than in terms of bandwidth and frequency steps, and is consistent with the wideband formulation of the ambiguity function. The algorithm makes use of the same basic code generating sequence used for narrowband frequency allocation, but the resulting signal will have invariant ambiguity sidelobe positions for any receiver realization in the delay-time compression plane. View full abstract»

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  • Corrections to "Current Injected Equivalent Circuit Approach to Modeling Switching DC-DC Converters"

    Publication Year: 1982 , Page(s): 350
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  • Corrections to "Current Injected Equivalent Circuit Approach to Modeling Switching DC-DC Converters"

    Publication Year: 1982 , Page(s): 350
    Save to Project icon | Request Permissions | PDF file iconPDF (127 KB)  
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  • Corrections to "Current Injected Equivalent Circuit Approach to Modeling Switching DC-DC Converters"

    Publication Year: 1982 , Page(s): 350
    Save to Project icon | Request Permissions | PDF file iconPDF (127 KB)  
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  • Corrections to "Current Injected Equivalent Circuit Approach to Modeling Switching DC-DC Converters"

    Publication Year: 1982 , Page(s): 350
    Save to Project icon | Request Permissions | PDF file iconPDF (127 KB)  
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  • IEEE copyright form

    Publication Year: 1982 , Page(s): [350]-a - [350]-b
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    Freely Available from IEEE

Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the equipment, procedures, and techniques applicable to the organization, installation, and operation of functional systems designed to meet the high performance requirements of earth and space systems.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory