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  • Other Sources  (166)
  • COMMUNICATIONS AND RADAR  (166)
  • 1975-1979  (166)
  • 1976  (166)
  • 1
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    NASA teleconference pilot project evaluation for 1975 (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Tabular data were given to summarize the results of the NASA teleconferencing network pilot project for 1975. The 1,241 evaluation reports received indicate that almost 100,000 man-hours of teleconferences took place. The travel funds reported saved total about $1.44 million, which is about 10% of the NASA travel costs. Subtracting the cost of providing the teleconferencing networks, the net savings reported are $1.28 million (about 9% of the travel costs). The teleconferencing network has proved to be successful in conducting many management meetings and reviews within NASA and its contractors. In spite of difficulties caused by inexperience in teleconferencing and some equipment and circuit problems, the evaluation reports indicated the system was satisfactory in an overwhelming majority of cases.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-X-74161
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Effects of propagation phenomena and frequency allocation on the growth of satellite communications (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The development of new allocations and new frequency and orbit sharing criteria for satellite communications below 10 GHz is discussed. These criteria are dependent on the outcome of current spectrum and orbit utilization and propagation studies addressing such problems as intersystem interference, satellite spacing, positioning, and repositioning, spillover of radio signals across geographic boundaries, and the adverse effects of propagation phenomena. These problems are discussed in relation to preparations for the 1979 General World Administrative Radio Conference.
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Conference on Communications; Jun 14, 1976 - Jun 16, 1976; Philadelphia, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Definition Study for Space Shuttle Experiments Involving Large, Steerable Millimeter-Wave Antenna Arrays (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The potential uses and techniques for the shuttle spacelab Millimeter Wave Large Aperture Antenna Experiment (MWLAE) are documented. Potential uses are identified: applications to radio astronomy, the sensing of atmospheric turbulence by its effect on water vapor line emissions, and the monitoring of oil spills by multifrequency radiometry. IF combining is preferable to RF combining with respect to signal to noise ratio for communications receiving antennas of the size proposed for MWLAE. A design approach using arrays of subapertures is proposed to reduce the number of phase shifters and mixers for uses which require a filled aperture. Correlation radiometry and a scheme utilizing synchronous Dicke switches and IF combining are proposed as potential solutions.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-144802 , ESL-3931-3 , FR-3931-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Remarks by Dr. James C. Fletcher at Conference on Satellite Communication and Public Service (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The present status of communications satellites, together with the future goals and technology developments in use of public service, is assessed. Improvements in design during the last decade considerably cut the cost of their development and launching, and the systems carry information to millions of people on earth. The space shuttles will change the rules in design and make it possible for communications satellites to have multiple frequencies operating at high power.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-NEWS-RELEASE-76-202 , P76-10198 , Dec 09, 1976; Greenbelt, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Locate and rescue system components (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Two types of search and rescue systems not involving satellites are studied; one using a network radio communications link and the other a characteristic beacon signal. Line of slight limitation of VHF radio and beacon signals limit the range (approximately 25 miles) between the origin of the distress signal and the mobile rescue unit.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-144836
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    A depolarization and attenuation experiment using the CTS satellite. Volume 1: Experiment description (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: An experiment for measuring precipitation attenuation and depolarization on the Communications Technology Satellite (CTS) 11.7 GHz downlink is described. Attenuation and depolarization of the signal received from the spacecraft is monitored on a 24 hour basis. Data is correlated with ground weather conditions. Theoretical models for millimeter wave propagation through rain are refined for maximum agreement with observed data. Techniques are developed for predicting and mimimizing the effects of rain scatter and depolarization on future satellite communication systems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-152422
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Simulation of the reconstruction of distorted digital data (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results of simulation runs obtained while varying detector sampling rates and threshold levels for a 20,000 foot equalized cable and a bit rate of 1 Mbs are given. The simulation techniques appear useful for preliminary design of detector levels and sampling rates and for analyzing sensitivity of detector performance as system transfer function parameters are varied.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Midwest Symposium on Circuits and Systems; Aug 16, 1976 - Aug 17, 1976; Milwaukee, WI
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A generalization of MSK-type signaling based upon input data symbol pulse shaping (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Minimum-shift-keying (MSK), which is a special case of continuous phase frequency-shift-keying (CPFSK) with frequency deviation ratio equal to 0.5, is known to be spectrally equivalent to a form of offset quadrature phase-shift-keying (OQPSK) in which the symbol pulse shape is a half-cycle sinusoid rather than the usual rectangular form. Appropriate shaping of the input data symbols allows one to generate an entire class of constant envelope, MSK-type signals, whose spectral properties are in some applications more desirable than those of MSK or OQPSK. The present study derives and presents a set of conditions on the input pulse shaping which in turn describes the class of envelope shapes allowable. The autocorrelation function and power spectral density of this class of signals are then derived, and specific examples are given to illustrate the desirable spectral properties. Such properties are important considerations in system design where interchannel and intersymbol interference degradations must be kept to a minimum.
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Conference on Communications; Jun 14, 1976 - Jun 16, 1976; Philadelphia, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    United States societal experiments via the Communications Technology Satellite (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: After a brief description of the Communication Technology Satellite and its U.S. coverage, the U.S. societal experiments via the CTS are discussed. These include education (college curriculum sharing, and project interchange), health care (biomedical communications, health communications, and communication support for decentralized education), and community and special experiments (satellite library information network, and transportable earth terminal).
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Conference on Communications; Jun 14, 1976 - Jun 16, 1976; Philadelphia, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Precipitation-attenuation studies based on measurements of ATS-6 20/30-GHz beacon signals at Clarksburg, Maryland (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Radiometric sky temperature and minute precipitation measurements were intended to broaden the data base required to advance the understanding of the propagation characteristics of the earth-satellite path at frequencies over 10 GHz. Analyses of the data collected from the measurement program have established a detailed correlation between the satellite signal and the signals from auxiliary ground-based measurements. The indirectly derived statistics agreed reasonably well (or can be reconciled) with the earlier published results. The correlations may therefore be used for indirectly estimating long term cumulative attenuation statistics in the absence of direct satellite signal measurements.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-152501 , CLP-74-110
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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