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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • March 1968

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Displaying Results 1 - 25 of 34
  • [Front cover]

    Publication Year: 1968, Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Group

    Publication Year: 1968, Page(s): nil1
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    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 1968, Page(s): nil1
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    Freely Available from IEEE
  • From the Editors

    Publication Year: 1968, Page(s): 137
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    Freely Available from IEEE
  • Engineering Professionalism and Society (Or, Are We Engineers Really Human Beings?)

    Publication Year: 1968, Page(s):138 - 141
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1149 KB)

    The problems of engineering professionalism, working conditions, and ethics have long been a subject of much controversy but little well-written material. In this paper, the author attempts to analyze some of the more troublesome of these problems, and offers a few solutions of his own device. Although written in a semi-humorous vein, the subject material deals directly with professional/ethical p... View full abstract»

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  • The Application of Overstress Testing-to-Failure to Airborne Electronics-A Status Report

    Publication Year: 1968, Page(s):142 - 148
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3086 KB)

    Several years of study and actual testing have answered many of the previously controversial questions about the application of environmental overstress testing-to-failure as a useful tool for reliability evaluation. The answers included the fact that more than 65 percent of the failures occurring under overstress environments were duplicates of experienced operational failures. Improvements of 5 ... View full abstract»

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  • Fading from Irregular Surfaces for Line-of-Sight Communications

    Publication Year: 1968, Page(s):149 - 163
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2933 KB)

    This paper is concerned with the communications channel between a planetary flyby or orbiting spacecraft and an ejected probe that is traveling toward the planet. Since the mission requires that a significant part of the probe's transmitted energy be reflected from the irregular planet's surface, we will be concerned with the effect of the scattered signal for line-of-sight communications. The sta... View full abstract»

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  • Angular Glint and the Moving, Rotating, Complex Radar Target

    Publication Year: 1968, Page(s):164 - 173
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2190 KB)

    Angular glint produces errors in radar-indicated target direction and in the Doppler frequency. Glint arises from phase perturbations of the radar signal echoed from a complex target, as compared to those from a point target. The phase gradient V¿ represents these glint effects very well. The direction of this vector is that of radar angle sensing. The Doppler shift is obtined from the dot produc... View full abstract»

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  • Performance of Sidelobe Blanking Systems

    Publication Year: 1968, Page(s):174 - 180
    Cited by:  Papers (32)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1330 KB)

    Sidelobe blanking systems are useful in preventing acquisition of strong targets in the antenna sidelobes and also in rejecting pulsed interference originating in the sidelobes. The analysis of a common two-channel system is presented in which the relationship between the probability of main-lobe detection and the probability of sidelobe detection are given in terms of false-alarm probability, sig... View full abstract»

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  • Resonant Cavity Measurements of Ionized Wakes

    Publication Year: 1968, Page(s):181 - 186
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1652 KB)

    A transmission resonant cavity technique, which is suitable for making measurements of electron line densities and collision frequencies in the ionized wakes of hypervelocity projectiles, is described. With this method electron density measurements can be made over six orders of magnitude. Resonant cavity design requirements and limitations of the method are discussed. Typical data from measuremen... View full abstract»

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  • Range Contamination and Its Effect on Measurements

    Publication Year: 1968, Page(s):187 - 193
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3606 KB)

    Increased sensitivity and dynamic range of the instrumental techniques used in conjunction with experiments on ballistic ranges have brought to the fore many problems arising from contamination in the ranges themselves. This is seldom discussed when experimental results are presented but is frequently the controlling limitation on the accuracy of the measurements. The authors discuss contamination... View full abstract»

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  • FM Telemetry for Multiple Force Measurements on Free-Flying Models

    Publication Year: 1968, Page(s):194 - 201
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3614 KB)

    The extension of the FM telemetry technique to provide simultaneous measurements of four forces acting on a free-flight aerodynamic model is reported. Developments and procedures required to achieve the accuracy, linearity, and stability necessary for obtaining dynamic stability coefficients are described. System accuracy is believed to be better than 3 percent. Free-flight data, presented in the ... View full abstract»

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  • Recent Developments in Heat-Transfer-Rate, Pressure, and Force Measurements for Hot-Shot Tunnels

    Publication Year: 1968, Page(s):202 - 209
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4246 KB)

    Recent developments in transducers for measuring heat-transfer rate, pressure, and force, designed for use in hot-shot tunnels, have resulted in improved measurement capabilities. A description of these transducers and their performance characteristics is given. View full abstract»

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  • A Six-Component Balance

    Publication Year: 1968, Page(s):210 - 217
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4366 KB)

    A six-component force-measuring balance for impulse wind tunnels is described. The application of semiconductors for force and acceleration measurement, and their mechanical and electronic coupling for the desired operational outputs are given. The dynamic calibration procedures are explained and verified for the conditions encountered in hot-shot-type wind tunnels. View full abstract»

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  • Time-Optimal Control of a Bounded Phase-Coordinate Process II: High-Order Systems with Multiple Control Inputs

    Publication Year: 1968, Page(s):218 - 233
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2428 KB)

    This paper considers the problem arising from the design of an autopilot for a large booster. The motion-controlling actuators of the booster have both position and rate limits. The problem is formulated as a bounded phase-coordinate problem and analyzed by the ``backing out of the target'' procedure. A method of constructing the optimal control is presented. An example of an oscillatory system wi... View full abstract»

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  • Airborne Collision Avoidance System Development-Introduction

    Publication Year: 1968, Page(s):234 - 237
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1226 KB)

    A collision avoidance system (CAS) has been the goal of the airlines for more than a decade. Both technology and a detailed understanding of the problem developed to a point where a system could be defined. A CAS system using stable time and frequency technology has been defined as a result of the joint effort of the airlines and selected manufacturers. The result of these efforts is presented. View full abstract»

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  • History of Time-Frequency Technology

    Publication Year: 1968, Page(s):238 - 256
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7906 KB)

    Present-day collision avoidance systems (CAS) of the time-frequency variety employ modes of operation similar to those of airborne equipment which has been operating in military aircraft since 1959. A fleet operational evaluation of these systems began in 1961 in aircraft of U. S. Navy Helicopter Squadron HS-4, based on the aircraft carrier U.S.S. Yorktown. This equipment utilized a local clock in... View full abstract»

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  • Collision Avoidance System Synchronization

    Publication Year: 1968, Page(s):257 - 264
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1997 KB)

    The collision avoidance synchronization system provides a method by which over 1000 aircraft can be accommodated in a 250-mile radius. Information is exchanged at a data rate of once every 3 seconds. Master-time synchronization permits one-way ranging between aircraft with an rms range error of less than 120 feet (36.6 meters) when both use the same master. A maximum error of less than 1000 feet (... View full abstract»

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  • Master Timing of CAS Ground Stations

    Publication Year: 1968, Page(s):265 - 272
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2038 KB)

    The characteristics of a master time and master-time dissemination subsystem for a collision avoidance system acceptable to the Air Transport Association of America are investigated. Selection of a time scale, a ground-station timing standard, and a synchronization technique are discussed. The conclusions are that a uniform time scale is ideal for the application, that a minimum of four cesium-bea... View full abstract»

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  • CAS Message Format

    Publication Year: 1968, Page(s):273 - 277
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1798 KB)

    The collision avoidance system (CAS) defined by the ATA provides for the exchange of range, range-rate, and altitude data, as well as the less significant items of altitude rate and north-south and east-west velocity vector data. This paper discusses the CAS message format and presents data (based on McDonnell-Douglas in-flight experience with its EROS system) on the accuracy of gathering the CAS ... View full abstract»

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  • Biphase Barker-Coded Data Transmission Recommended Techniques for CAS

    Publication Year: 1968, Page(s):278 - 282
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1391 KB)

    The use of biphase modulation and Barker data coding within the 200-us range/Doppler transmission proposed for collision avoidance systems (CAS) is described. Following a general discussion of requirements for compatibility between important CAS threat-evaluation measurements and less essential message communications, emphasis is placed on consideration of the binary Barker pulse sequences and the... View full abstract»

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  • Spectral Energy Requirements and Adjacent-Channel Crosstalk in CAS

    Publication Year: 1968, Page(s):283 - 289
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    Four-frequency channels avoid the prior slot interference that handicaps single-frequency collision avoidance systems of equal message-slot capacity. Crosstalk between adjacent frequency channels is adequately limited If the receiver response to adjacent-channel signals is attenuated at least 52 dB. With 5-MHz channel separation, 48-dB crosstalk rejection was achieved in a test receiver by restric... View full abstract»

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  • Slot Length and Line-of-Sight Protection

    Publication Year: 1968, Page(s):290 - 294
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1386 KB)

    The reasoning which led to the particular slot structure defined for the collision avoidance system specified by the Air Transportation Association Collision Avoidance System Technical Working Group is discussed. The objectives were to choose a slot length that would 1) minimize the probability of interference, 2) maximize the capacity of the information channel (as measured by the number of messa... View full abstract»

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  • Elements of the ATA Collision Avoidance System

    Publication Year: 1968, Page(s):295 - 304
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2012 KB)

    The Airline Air Traffic Control Committee CAS Technical Working Group has prepared a technical description of an airborne collision avoidance system. This ATA system is presented in block diagram form with the major functional blocks and signal flow discussed. The ``minimum system'' discussed in the technical description and some anticipated optional additions to the air-carrier system are include... View full abstract»

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  • Analysis of Warning Times For Collision Avoidance Systems

    Publication Year: 1968, Page(s):305 - 314
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3048 KB)

    The time required to execute a successful escape maneuver must be deduced from considerations of the following times: time required to gain adequate altitude separation, delay time due to pilot reaction, aircraft servo-system delay, delay due to missed data, delay due to data arrival time, alarm delay due to ¿ errors, time to stop turning, and time to level off. Since each of these times is a ran... 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