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IEEE Transactions on Communications

Issue 11  Part 1 and 2 • Date November 1978

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Displaying Results 1 - 25 of 37
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • Introduction: Special Issue on Space Shuttle Communications and Tracking

    Publication Year: 1978, Page(s):1481 - 1483
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    Freely Available from IEEE
  • Space Shuttle Program Description and Status

    Publication Year: 1978, Page(s):1484 - 1493
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5622 KB)

    The Space Shuttle Program objective is to establish a national space transportation capability that will substantially reduce the cost of space operations and support a wide range of scientific, defense, and commerical uses. The Space Shuttle Program has successfully completed its first phase-the Approach and Landing Test (ALT) Program. Testing is currently underway on all major components of the ... View full abstract»

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  • An Overview of the Space Shuttle Orbiter Communication and Tracking System

    Publication Year: 1978, Page(s):1494 - 1506
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1382 KB)

    During space flight, the communications and tracking system of the Space Shuttle Orbiter uses S -band and Ku -band links to provide, in addition to tracking, reception of digitized voice, commands, and printed or diagrammatic data at a maximum rate of 216 kbits/s. The system provides a transmission capability for digitized vo... View full abstract»

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  • STDN in the TDRSS and Shuttle Era

    Publication Year: 1978, Page(s):1506 - 1513
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    NASA presently maintains a worldwide system of ground tracking stations to provide communication support (tracking, telemetry and command) to all authorized user spacecraft missions. The set of ground stations supporting Earth orbiting missions, and their supporting communication links (called NASCOM) to various NASA centers, is designated as the Spaceflight Tracking and Data Network (STDN). Major... View full abstract»

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  • Use of Radio Equipment for Space Shuttle Navigation

    Publication Year: 1978, Page(s):1514 - 1520
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (745 KB)

    This paper discusses the role of radio navigation and communications equipment for Space Shuttle navigation. Radio navigation systems are discussed in terms of their ability to support Space Shuttle flight operations. A phased development of navigation capability from conventional trackers to relay satellites and navigation satellites is reviewed. View full abstract»

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  • Orbiter S-Band Communications Subsystem

    Publication Year: 1978, Page(s):1521 - 1531
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB)

    The salient performance parameters of the black boxes used to form the Shuttle S -band system are summarized. Included are functional descriptions as well as design capabilities and limitations. Some of the design problems which were encountered are discussed and the subsequent actions to resolve them. The available operating modes for each box and integration ... View full abstract»

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  • Phase Noise Effects on Space Shuttle Communications Link Performance

    Publication Year: 1978, Page(s):1532 - 1541
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The purpose of this paper is to present a theory which can be used to determine the effects which phase noise sources produce on the bit error probability performance of phase coherent links. The paper begins by presenting typical math models for phase noise sources known to exist in frequency generators. These phase and frequency instability models are then incorporated into equivalent loop model... View full abstract»

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  • The Effects of Residual Carrier on Costas Loop Performance as Applied to the Space Shuttle Orbiter S-Band Uplink

    Publication Year: 1978, Page(s):1542 - 1548
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (535 KB)

    When a Costas loop is operated in a PM mode, such as on the Space Shuttle Orbiter S -band uplink during the time when both data and a ranging subcarrier are linearly modulated on the carrier, and if the data modulation index is less than \pi/2 , the loop must reconstruct its carrier reference from an input signal whose car... View full abstract»

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  • Delay-Lock-Loop Mean Time to Lose Lock

    Publication Year: 1978, Page(s):1549 - 1557
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (619 KB)

    A solution to the mean time to lose lock for a first order, pseudo-noise, code tracking loop is derived for both the fulltime delay-lock loop and the time-shared delay lock loop, with both utilizing an early-late gate size of 1/2 chip, and assuming ideal bandpass filters. The result allows a spread spectrum system designer to assess the slip time performance of his code tracking loop by a simple c... View full abstract»

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  • Space Shuttle Payloads and Data Handling Accommodations

    Publication Year: 1978, Page(s):1557 - 1567
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2529 KB)

    This paper provides an overview of the various classes of candidate payloads to be flown on early Shuttle missions and summarizes the communications and data handling services which the Space Shuttle will provide for payloads. The Space Shuttle system mission capabilities are briefly described and data processing capabilities for payload support are discussed for the various classes of payloads. View full abstract»

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  • Spacelab-Its Command and Data Management Role in the Space Transportation System

    Publication Year: 1978, Page(s):1568 - 1583
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1697 KB)

    This paper describes the Spacelab command and data management system for both the manned-module and pallet-only configurations. The Spacelab support capabilities for various types of experiments are described in terms of data processing, display, recording and multiplexing. The Spacelab's utilization of Orbiter data processing and data transmission capabilities is also discussed. View full abstract»

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  • Communication with Shuttle Payloads

    Publication Year: 1978, Page(s):1584 - 1594
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1059 KB)

    One mission of the Shuttle is to place payloads into Earth orbit or on escape trajectories and to recover payloads from Earth orbit. In order to properly deploy and retrieve such payloads, operational and diagnostic communications must take place between the payloads and the Shuttle. The results of such communications, in the form of tracking, commands, and telemetry, will be interpreted both aboa... View full abstract»

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  • Microprocessor Bit Synchronizer for Shuttle Payload Communications

    Publication Year: 1978, Page(s):1594 - 1603
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1070 KB)

    An example of the growing influence of the microprocessor in communications is illustrated in this description of the payload bit synchronizer and other related payload signal processing functions for the Space Shuttle. Stored in firmware the microprogrammed control at 2.56 M-instructions/s accomplishes bit synchronization, matched filter detection, NRZ- L conv... View full abstract»

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  • Orbiter Ku-Band Integrated Radar and Communications Subsystem

    Publication Year: 1978, Page(s):1604 - 1619
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1478 KB)

    The Ku band subsystem for the NASA Space Shuttle Orbiter operates either as a radar system during rendezvous with other space vehicles or as a two-way communications system with the ground through the Tracking and Data Relay Satellite System (TDRSS). In its radar function the equipment searches for, acquires, tracks, and provides the spatial data needed to make ... View full abstract»

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  • Performance Analysis of Pulse Doppler Digital Radars with Application to the Shuttle Ku-Band System

    Publication Year: 1978, Page(s):1620 - 1635
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1239 KB)

    The performance of a class of pulse Doppler radars with a digitally implemented signal processing unit is investigated. The Ku band rendezvous radar onboard the Shuttle Orbiter is a pulse Doppler radar which is in this class. The detection capability is first presented. A unified analysis of digital radar tracking loops is presented which employs logarithmic dis... View full abstract»

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  • A 50 Mbit/s Multiplexed Coding System for Shuttle Communications

    Publication Year: 1978, Page(s):1636 - 1638
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The design and implementation of a multiplexed 50 Mbit/s convolutional encoder/decoder system is described. An implementation strategy utilizing multiple medium speed Viterbi decoders is presented, along with test equipment used to simulate a complete coded communications system. View full abstract»

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  • Effects of Data Asymmetry on Shuttle Ku-Band Communications Link Performance

    Publication Year: 1978, Page(s):1639 - 1651
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (911 KB)

    This paper systematically analyzes the signal-signal-to-noise ratio degradations which can potentially occur due to data asymmetry in digital transmission systems. Suitable asymmetry models are developed and error probability performance for various types of data detectors (integrate-and-dump filter, filter-sample detector, and gated-integrate-and-dump filter) is derived. Although this work was do... View full abstract»

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  • Voice Encoding for the Space Shuttle Using Adaptive Delta Modulation

    Publication Year: 1978, Page(s):1652 - 1659
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (874 KB)

    Two algorithms for voice encoding are described. One, the modified Abate, is a simplified version that is the type designed for the Space Shuttle. Waveforms of the response of the delta modulators to channel errors are given and performance data that shows the relationship between channel errors and word intelligibility are included. An analytic derivation yielding a comparison between PCM and ada... View full abstract»

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  • The Space Shuttle Ground Terminal Delta Modulation System

    Publication Year: 1978, Page(s):1660 - 1670
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (853 KB)

    Shuttle voice processing uses a Variable Slope Delta Modulation scheme which is a variant of the ABATE algorithm. This paper summarizes the ground terminal subsystem which processes the multiplexed voice and telemetry data digital sequence in the downlink processing and digitizes the voice signal in the uplink processing. The Delta Modulation System (DMS) performance characteristics are given in t... View full abstract»

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  • Potential Digitization/Compression Techniques for Shuttle Video

    Publication Year: 1978, Page(s):1671 - 1682
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1370 KB)

    The Space Shuttle initially will be using a field-sequential color television system but it is possible that an NTSC color TV system may be used for future missions. In addition to downlink color TV transmission via analog FM links, the Shuttle will use a high resolution slow-scan monochrome system for uplink transmission of text and graphics information. This paper discusses the characteristics o... View full abstract»

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  • Video Encoding Using Adaptive Delta Modulation

    Publication Year: 1978, Page(s):1682 - 1689
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2152 KB)

    This paper describes several adaptive delta modulators designed to meet NASA's potential need to digitally encode video signals. The adaptive delta modulators described are: (1) One-dimensional ADM to encode black-and-white pictures and also transmit digitally encoded voice with no increase in bandwidth (2) An ADM to encode field-sequential color; (3) An ADM to encode color video signals. The unit... View full abstract»

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  • Spread Spectrum Acquisition and Tracking Performance for Shuttle Communication Links

    Publication Year: 1978, Page(s):1689 - 1703
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1010 KB)

    The spread spectrum acquisition and tracking performance for the Shuttle S -band and Ku -band communication links are analyzed and compared to test results. The S -band link requirements are more severe than those of the Ku -band links, hence, different ... View full abstract»

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  • False Lock Performance of Shuttle Costas Loop Receivers

    Publication Year: 1978, Page(s):1703 - 1712
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    The false (sideband) lock problem in Shuttle Costas loop receivers, in the presencse of noise, is assessed in this paper. False lock margin is defined depending on symbol signal-to-noise ratio rather than in the absence of noise as reported earlier in [4], [5]. Closed form results are given when the arm filters of the Costas loop are one-pole Butterworth filters as used in the Shuttle receivers. H... View full abstract»

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  • Antenna Development for the Space Shuttle Orbiter Vehicle

    Publication Year: 1978, Page(s):1713 - 1722
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1364 KB)

    The selection, design and development of the Orbiter antenna subsystem described herein gives some insight into the problems and solutions encountered on the Orbiter vehicle design. The uniqueness of the Orbiter spacecraft, in terms of being both a spacecraft and airborne vehicle, designed for multiple flights with little or no refurbishment between missions, required a state-of-the-art developmen... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas