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  • Other Sources  (1,071)
  • COMMUNICATIONS AND RADAR  (1,071)
  • 1980-1984  (1,071)
  • 1
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    The concept of an integrated terrestrial/land mobile satellite system (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Potential satellite markets in the Public Safety (disaster relief, emergency medical and law enforcement) and Common Carrier (mobile radio telephone) service areas are identified. The public mobile telephone segment is then examined to illustrate a methodology for identifying a potential satellite addressable market, including capacity requirements for roughly sizing a satellite. It is postulated that satellites could serve this lower density (mobiles/sq. km), thin-route markets at a competitive cost and thus complement terrestrial systems in the urban and more densely populated areas to provide an integrated nationwide mobile service.
    Keywords: COMMUNICATIONS AND RADAR
    Type: ICC ''80; International Conference on Communications; Jun 08, 1980 - Jun 12, 1980; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Scatter of X-rays on polished surfaces (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: In investigating the dispersion properties of telescope mirrors used in X-ray astronomy, the slight scattering characteristics of X-ray radiation by statistically rough surfaces were examined. The mathematics and geometry of scattering theory are described. The measurement test assembly is described and results of measurements on samples of plane mirrors are given. Measurement results are evaluated. The direct beam, the convolution of the direct beam and the scattering halo, curve fitting by the method of least squares, various autocorrelation functions, results of the fitting procedure for small scattering, and deviations in the kernel of the scattering distribution are presented. A procedure for quality testing of mirror systems through diagnosis of rough surfaces is described.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-76443 , MPI-PAE/EXTRATERR-163
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Communications via the radio artificial earth satellite: Design of the tracking diagram and features for conducting QSO (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A detailed examination is made of the operation of a transmitting artifical Earth satellite. A tracking diagram for the satellite is constructed. The zone of radio visibility can be determined based on the techniques proposed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-76105
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Need for, and financial feasibility of, satellite-aided land mobile communications (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Questions regarding the role of a mobile-satellite system in augmenting the terrestrial communications system are considered, and a market assessment study is discussed. Aspects of an investment analysis are examined, taking into account a three phase financial study of four postulated land Mobile Satellite Service (LMSS) systems, project profitability evaluation methods, risk analysis methods, financial projections, potential investor acceptance standards, and a risk analysis. It is concluded that a satellite augmented terrestrial mobile service appears to be economically and technically superior to a service depending exclusively on terrestrial systems. The interest in the Mobile Satellite Service is found to be worldwide, and the ground equipment market is potentially large.
    Keywords: COMMUNICATIONS AND RADAR
    Type: ICC ''82 - The digital revolution; International Conference on Communications; Jun 13, 1982 - Jun 17, 1982; Philadelphia, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    On the theory of self-focusing of powerful wave beams in nonhomogeneous media (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The stationary self-focusing of the Gauss wave beam is considered in a nonhomogeneous medium in the case of local nonlinearity. Equations of the aberrationless approximation for the beam width, the field on the beam axis and the refraction factor are integrated on a computer. Self-focusing in dependence of the nonlinearity level and initial divergence, the dissipation, the length of nonhomogeneity of the dielectric permittivity nondisturbed by a beam, and the diffraction parameter are investigated.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-77223 , NAS 1.15:77223
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Propagation effects handbook for satellite systems design. A summary of propagation impairments on 10 to 100 GHz satellite links with techniques for system design (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This Propagation Handbook provides satellite system engineers with a concise summary of the major propagation effects experienced on Earth-space paths in the 10 to 100 GHz frequency range. The dominant effect, attenuation due to rain, is dealt with in some detail, in terms of both experimental data from measurements made in the U.S. and Canada, and the mathematical and conceptual models devised to explain the data. In order to make the Handbook readily usable to many engineers, it has been arranged in two parts. Chapters 2-5 comprise the descriptive part. They deal in some detail with rain systems, rain and attenuation models, depolarization and experimental data. Chapters 6 and 7 make up the design part of the Handbook and may be used almost independently of the earlier chapters. In Chapter 6, the design techniques recommended for predicting propagation effects in Earth-space communications systems are presented. Chapter 7 addresses the questions of where in the system design process the effects of propagation should be considered, and what precautions should be taken when applying the propagation results.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-RP-1082(03) , NAS 1.61:1082(03) , ORI-TR-1905
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Telecommunication applications of millimeter waves (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: For abstract see A81-44300
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-76989 , NAS 1.15:76989
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Communications satellite no. 2 (CS-2) (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The purpose of the Japanese CS-2 satellite is to provide national communications and industrial communications, such as special emergency and remote communications, and to contribute to the development of technology pertaining to communications satellites. Description and operating parameters of the following satellite components are presented: structure, communications system, telemetry/command system, electric power system, attitude and antenna control system, secondary propulsion system, apogee motor, framework, and heat control system.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-76950 , NAS 1.15:76950
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Radio emission evolution of nonstationary sources in the Hedgehog model (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Correlations are obtained for numerical calculation of flux F sub v and polarized radiation intensity of a cloud of arbitrary geometry, consisting of ultrarelativistic electrons that dissipate in a radial magnetic field of the nucleus at a random angle to the observer. It is possible that some of the variable extragalactic objects that were previously described by the Shklovskiy model are young formations in the examined model. Radio astronomical observations would permit a determination of their distance, age, and lifetime.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-76210 , PR-324
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Wave guide branchings (n-port) types of representation of linear, time-independent and sourceless n-ports (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The wave representation and scattering matrix of n-ports is discussed. This representation is particularly suited to the treatment of microwave switching.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-77770 , NAS 1.15:77770
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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