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Aerospace and Electronic Systems, IEEE Transactions on

Issue 6 • Date Nov. 1970

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Displaying Results 1 - 25 of 35
  • Table of contents

    Publication Year: 1970 , Page(s): c1
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  • IEEE Aerospace and Electronic Systems Group

    Publication Year: 1970 , Page(s): c2
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  • From the Editors

    Publication Year: 1970 , Page(s): 745
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  • Space Station Information Management

    Publication Year: 1970 , Page(s): 746 - 763
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    General requirements and concepts for the 1975 space station information management problem are sized parametrically. Because of the need for feasible distribution of data to space and ground users over long-term flight conditions, emphasis has been placed on the preliminary concepts for onboard data processing and autonomous information handling combined with only single-point ground distribution. The requirements for such extensive critical data-distribution capabilities have been established from preliminary estimates. View full abstract»

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  • A Nutation Damper for a Dual-Spin Spacecraft

    Publication Year: 1970 , Page(s): 764 - 769
    Cited by:  Papers (5)
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    This paper is concerned with a high-performance nutation damper for use in dual-spin spacecraft. The damper described here makes use of a wheel of uniform mass distribution. The wheel experiences torques which are produced by inertial forces. Damping and restoring (spring) torques are provided by means of a torsional arrangement built around the center of the wheel. The performance characteristics of the above nutation damper are evaluated by considering the small astronomy satellite (SAS-A) spacecraft parameters, and the results for an optimum design of the damper are presented. Finally, the result for the optimum performance is checked with the help of an approximate analysis. View full abstract»

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  • Atmospheric Error in Range and Range-Rate Measurements between a Ground Station and an Artificial Satellite

    Publication Year: 1970 , Page(s): 770 - 779
    Cited by:  Papers (2)
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    The propagation errors caused by the atmosphere are investigated in order to find out the causes of the observed errors in range and range-rate measurements between a ground station and an artificial satellite. The calculations show that the observed errors are mostly caused by the measuring instruments. The propagation errors are mainly caused by increases, decreases, or fluctuations of the refractive index of the atmosphere, and the errors caused by the refraction of the propagation path are about 10 percent of the errors caused by the decrease of the propagation velocity. The tropospheric range errors are less than 150 meters and are approximately expressed by a cotangent function, and they are reduced by about 90 percent through the use of monthly average refractivity profiles of the troposphere. The ionospheric errors are usually negligible at centimeter radio waves (less than 10 cm), and even at decimeter waves or meter waves almost all errors can be removed by the use of two different frequencies on the down-link so that the range can be made independent of frequency. View full abstract»

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  • A Concept of Position Fixing by a Passive Mode Navigation Satellite System

    Publication Year: 1970 , Page(s): 780 - 789
    Cited by:  Patents (1)
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    A position fix in a passive mode using satellites usually necessitates an expensive computer or lengthy hand calculation. This is the largest drawback of passive navigation and it would be more desirable if the user could find his position by a mere glance at a chart and table, as one uses Loran. The first step toward this goal is to use a synchronous satellite because it simplifies the problem. The next step is to find the position of the user by a Loran type of chart, which is universal, and correct this apparent position by looking at a special table which is made according to the amount of perturbation of both the satellite and the user's position. An example of the position fix along the route between Yokohama to Hawaii is shown. The concept can be extended to orbiting satellites due to the rules which govern the motion of satellites, if the fix accuracy is in the order of 2 to 5 miles. This method should be more accurate than the common sextant and more practical due to the fact that the satellite can be used at any time and in any weather. As a total system, it will be better than Omega because it could provide additional navigation information such as communication or traffic control by using satellites. View full abstract»

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  • The Design of Huffman Sequences

    Publication Year: 1970 , Page(s): 790 - 796
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1789 KB)  

    The paper presents a method by which the zeros of the polynomial representing a Huffman (impulse-equivalent) pulse sequence can be chosen so as to exert a degree of control on the form of the energy distribution of the signal in the time-frequency plane. This makes it possible to design Huffman pulse sequences which are suitable for use as radar or sonar signals in situations where significant target velocity occurs. View full abstract»

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  • Silicon Solar Cell Performance at High Intensities

    Publication Year: 1970 , Page(s): 797 - 803
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    The theoretical and experimental work performed since 1960 in the area of high-intensity and high-temperature operation of silicon and gallium arsenide photovoltaic devices is reviewed. Test results for conventional 5-grid silicon cells, for specially designed 13-grid silicon cells, and for a GaAs cell are presented parametrically for the illumination intensity range from 0.07 to 2.8 W/cm2 and the temperature range from 30 to 1 50°C. The data cover the 3 points on the currentvoltage characteristic required to reconstruct the full characteristic in the power-generating quadrant. The 13-grid silicon cells showed much better performance than the GaAs cell. View full abstract»

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  • The Use of Computers in Editing and Composition

    Publication Year: 1970 , Page(s): 804 - 810
    Cited by:  Patents (3)
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    The modern digital computer is rapidly permeating all areas of our highly industrialized society-from agriculture to education-from process control to zoology. Printing and publishing and allied fields involved in graphic communications have been changing rapidly in this decade as the digital computer and associated peripheral devices have made rapid inroads in the graphic communications process. This paper describes the nature of the impact which the digital computer has had, and is making, upon today's graphic communications, particularly upon the editing and composition functions. A prediction of future impact is also presented. View full abstract»

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  • Efficient Transmission of Graphics Using Polyomino Filtering at the Receiver

    Publication Year: 1970 , Page(s): 811 - 814
    Cited by:  Patents (2)
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    A simple new coding scheme has been developed which increases the transmission efficiency for graphics by a factor of 2, or what amounts to the same, can transmit two documents over the initial channel used to transmit a single picture, while preserving the subjective picture quality. Based on the exploration of polyominoes, the initial message is submitted to a well-defined information extraction process at the transmitter and a corresponding reconstruction manipulation for message display at the receiver. View full abstract»

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  • Computational Algorithms for a Pseudo-Bayes Digital Radar Receiver

    Publication Year: 1970 , Page(s): 815 - 820
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    In this paper discrete likelihood ratio computational algorithms resulting from recent studies in detection theory are applied to the general radar detection problem in which it is desired to detect the presence or absence of a sinusoidal pulse with unknown time of arrival, frequency, and phase. The resulting optimum digital receiver structure isdetermined and computer simulation results presented. View full abstract»

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  • Effects of the Sea on Radar Echo from Rain

    Publication Year: 1970 , Page(s): 821 - 824
    Cited by:  Papers (3)
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    Theoretical analyses are made to determine expected relative values of average radar cross section for idealized scatterers above the sea. Horizontal, vertical, and circular polarizations are considered along with various sea states and radar depression angles. The results are considered to be useful for providing insight into effects of the sea on the polarization dependence of rain return. Effects of the earth's curvature and atmospheric refraction are neglected. View full abstract»

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  • ATS-5 Millimeter Wave Propagation Experiment

    Publication Year: 1970 , Page(s): 825 - 831
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    This paper describes the design of the millimeter wave experiment aboard the ATS-5 satellite. This equipment is the first millimeter wave communications equipment in space. The function of the equipment is to provide earthspace propagation data at Ku- and Ka- band frequencies. The designs of the phase locked Ka- band receiver, the Ku-band transmitter, the antennas, and the telemetry and processing equipment are described. Mechanical and environmental problems are also discussed. View full abstract»

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  • Optical Simulation of Radar Ambiguities

    Publication Year: 1970 , Page(s): 832 - 840
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    Coherent optical systems, because of their basic similarity to coherent radar systems, can be used to simulate many of the characteristics of the latter. This paper discusses the use of a coherent optical system for the simulation of the range and azimuth ambiguities that sometimes occur in radar systems. The optical configurations for implementing these simulations are described in detail, and extensive experimental results are presented. View full abstract»

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  • Doppler Spectral Moments of Radar Scattering from Turbulent Ionized Wakes

    Publication Year: 1970 , Page(s): 841 - 843
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    The Doppler frequency shift, and spectral spread, of the radar scattering return from turbulent underdense ionized wakes are explicitly related here to the wake mean velocity, and to the wake turbulent velocity fluctuations and mean velocity gradients, respectively, via spectral moments of the matched-filter receiver response. View full abstract»

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  • Rocketsonde Transmission Link Characteristics

    Publication Year: 1970 , Page(s): 843 - 846
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    An improvement in high altitude communication with a small, rocket-borne sonde can be achieved by transmitting circularly polarized waves. Signal losses due to cross polarization of linear antennas can be reduced. Measured radiation patterns for instrument mounted linear and several helical antennas are presented. Flight data are discussed. View full abstract»

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  • Ball Lightning

    Publication Year: 1970 , Page(s): 846
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    First Page of the Article
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  • Effects of Doppler Mismatch on Combined Barker Codes

    Publication Year: 1970 , Page(s): 847 - 851
    Cited by:  Papers (1)
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    The output response of a matched filter for several cases of combined Barker codes is computed for various amounts of Doppler mismatch. It is shown that combined Barker codes, like conventional Barker codes, are extremely sensitive to Doppler shift. View full abstract»

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  • Selection of a Charging Choke Damping Network

    Publication Year: 1970 , Page(s): 851 - 854
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    The availability and ease of programming for many computer aided design (CAD) languages permits their use where, formerly, bread boarding or analytical means would have been employed to solve specific circuit analysis problems. One of many available CAD languages is the electronic circuit analysis program (ECAP). The ECAP language is divided into three sections, dc-analysis. acanalysis, and transient analysis. The three modes of ECAP together with fast computer access provide a helpful tool for the design engineer. Following is a typical problem of oscillatory transients encountered in line-type modulators. The solution to the problem is a model of sufficient correlation with the observed oscillation as an aid to find a network which will critically damp the oscillation. View full abstract»

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  • Balloon Position Determination on Venus

    Publication Year: 1970 , Page(s): 854 - 855
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    A position determination technique for balloons floating in the Venusian atmosphere is described. Measurements are all made using a single station of the NASA Deep Space Network. One coordinate of the fix is derived from a ranging measurement, and the other coordinate is derived from observation on earth of the polarization of a signal radiated from a linearly polarized antenna on the balloon, aligned to vertical by balloon local gravity. View full abstract»

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  • Correction to "Stabilization of Precision Electrooptical Pointing and Tracking Systems"

    Publication Year: 1970 , Page(s): 855 - 857
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  • The challenge of compatibility in systems planning [Information]

    Publication Year: 1970 , Page(s): 858 - 861
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    This paper was presented at the G-AES Luncheon, NAECON 1970, Dayton, Ohio, May 19, 1970, where Mr. Hansel received the 1970 Pioneer Award (see page 721 of the September 1970 issue of this TRANSACTIONS). The author offers some personal obserivations on the challenge of compatibility in systems planninig with special reference to civil aviation He discusses VOR accuracy and RF spectrum utilization as typical compatibility problems and also as particularly timely and important challenges to planners who seek compatible evolution toward higher performance goals and efficient use of an important and limited natural resource. He notes several lessons to be learned about the challenge of compatibility in systems planning. 1) Major improvements of mature systems can be accomplished with minimum compatibility impact only if we plan and act boldly and early and with a long range perspective. 2) Many years are required to implement a major change in the fixed plant portion of a large system. This gives us time to introduce design changes in newly manufactured subscriber equipments long before any practicable deadline for full system implementation. By deadline time the relatively few older unchanged subscriber equipments still in service will be a minor fraction of the total in service. These remaining older equipments can then either be used without benefit of higher performance, or can be retrofitted or replaced at a cost which is an acceptable price for essential progress. 3) We have an often unrecognized obligation to the future as we plan both new systems and improvements and extensions of existing systems. This is the obligation to plan, from the outset, for progressive evolutionary compatibility, not only with existing equipments, but also with future performance requirements and with efficient use of the RF spectrum. 4) Near term compatibility requirements need not be and must not be permitted to become a deadening and stagnating constraint on future progress. View full abstract»

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  • Constitution IEEE Group on Aerospace and Electronic Systems (G-AES)

    Publication Year: 1970 , Page(s): 862 - 864
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  • Bylaws IEEE Group on Aerospace and Electronic Systems (G-AES)

    Publication Year: 1970 , Page(s): 865 - 870
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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.

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory