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  • Other Sources  (13)
  • 1970-1974  (13)
  • 1
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    Fields excited by an arbitrarily oriented dipole in a cylindrically inhomogeneous plasma (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Three dimensional fields excited by arbitrarily oriented dipole in cylindrically inhomogeneous isotropic plasma, deriving closed form solution
    Keywords: PHYSICS, PLASMA
    Type: ; YAL SOCIETY (
    Format: text
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  • 2
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    A multiple-beam spherical reflector antenna (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A spherical reflector with multiple feeds is considered for application in communications satellite systems. Data are presented which show that spherical reflectors possessing relatively high gain (40 db) and very small phase path error are feasible. A design of a spherical reflector utilizing corrugated horn feeds is considered. Radiation patterns are computed using the physical-optics technique. The designed antenna is approximately 60 lambda in diameter. Calculations performed for this antenna with three beams indicate that each beam has a gain of about 42 db, a beamwidth of 1.4 deg, and sidelobes that can be expected to be at least 28 db down. These results indicate that the feature of low sidelobes makes the spherical reflector a consideration for a multiple-beam communications satellite antenna.
    Keywords: COMMUNICATIONS
    Type: JPL Quart. Tech. Rev., Vol. 1, No. 3; p 88-96
    Format: application/pdf
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  • 3
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    Remote sensing of the turbulence characteristics of a planetary atmosphere by radio occultation of a space probe. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The purpose of this paper is to analyze the effects of small-scale turbulence on radio waves propagating through a planetary atmosphere. The analysis provides a technique for inferring the turbulence characteristics of a planetary atmosphere from the radio signals received from a spacecraft as it is occulted by the planet. The planetary turbulence is assumed to be localized and smoothly varying, with the structure constant varying exponentially with altitude. Rytov's method is used to derive the variance of log-amplitude and phase fluctuations of a wave propagating through the atmosphere.
    Keywords: SPACE SCIENCES
    Type: Radio Science; 8; Feb. 197
    Format: text
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  • 4
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    Effects of turbulence in the atmosphere of Venus on Pioneer Venus radio, phase 1 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The prediction of the turbulence effects in the Venus atmosphere on Pioneer Venus radio was investigated. A careful investigation based on a theoretical and experimental study of the power spectrum of the Mariner 5 amplitude fluctuations is carried out and the results contribute considerably to our scientific knowledge of turbulence in the atmosphere of Venus. Fully developed turbulence is seen to exist predominantly in the altitude range of 41 - 49 km. This result is consistent with the high wind shear and wind velocities observed by Venera 4 for altitudes higher than 40 km. The outer scale size of turbulence is on the order of 100 m, the structure constant for the dayside atmosphere 3.9 x 10 to the -7 power m to the -1/3rd power, and that for the nightside atmosphere 2.9 x 10 to the -7 power m to the -1/3rd power.
    Keywords: SPACE SCIENCES
    Type: JPL-TM-33-644 , NASA-CR-133598
    Format: application/pdf
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  • 5
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    Design method for minimizing RF voltage breakdown (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Research study was conducted and results were published. Using principles of similarity and minimum of experimental data, a number of universal curves have been constructed covering wide range of experimental parameters. Gases other than air, such as argon and carbon dioxide, also are included in study.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-13408
    Format: application/pdf
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  • 6
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    Effects of turbulence in a planetary atmosphere on radio occultation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A formulation is given for the correlation functions for the log-amplitude and phase fluctuations of both spherical and plane waves propagating in a turbulent medium whose correlation function for refractive index fluctuations is described by the product of a function of the average coordinate and a function of the difference coordinate. The results are applied to radio occultation of a flyby space probe by the atmosphere of Venus, assuming that the turbulence in the atmosphere exists as a layer, that it is localized, isotropic, and smoothly varying, and that the localized turbulence is described by the Kolmogorov spectrum. Closed-form solutions for both variances and frequency spectra of the log-amplitude and phase fluctuations are obtained using Rytov's method, and it is seen that the shape of the frequency spectra depends greatly on the characteristics and extent of the turbulence.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Antennas and Propagation; AP-22; July 197
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  • 7
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    Effects of turbulence in the atmosphere of Venus on Pioneer Venus radio, phase 2 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two problems related to the effects of turbulence in the atmosphere of Venus on the Pioneer entry probe radio link were studied. In the first problem, the cross correlation between the log amplitude and phase fluctuations of the Pioneer Venus communications link is examined. Data show that for fluctuation frequencies above approximately 1 Hz there is little or no correlation. For frequencies below this region the correlation is weak and the square root of the coherence has a peak value close to 0.65. The second problem consists of interferring turbulence characteristics of the Venus atmosphere from the Mariner 5 phase fluctuations. Data show that with the data processing techniques developed and currently available, the phase error due to oscillator drift, assumed trajectory delay, and spline curve fit exceed the turbulence induced fluctuations. Results show that it is not possible to interfere with the turbulence characteristics from Mariner 5 phase fluctuations.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-139657 , JPL-TM-33-702
    Format: application/pdf
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  • 8
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    RF voltage breakdown and the Paschen curve (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A representation based on the similarity relations for voltage breakdown is shown to be useful in combining RF and dc voltage breakdown data. The representation for the uniform field geometry is given.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE; vol. 62
    Format: text
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  • 9
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    RF Voltage Breakdown in Coaxial Transmission Lines Final Report (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: RF voltage breakdown in coaxial transmission lines
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-110935 , JPL-TR-32-1500
    Format: application/pdf
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  • 10
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    Theory for the effects of turbulence in a planetary atmosphere on radio occultation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Rytov's method is used to formulate the correlation functions for log-amplitude and phase fluctuations for both spherical and plane wave propagation in a turbulent medium whose correlation function for refractive index fluctuations is described by the product of a function of the average coordinate and a function of the difference coordinate. The results are applied to the study of radio occultation effects due to the atmosphere of Venus in the case of a flyby space probe. It is assumed that turbulence of isotropic and smoothly varying characteristics occurs in the Venusian atmosphere.
    Keywords: COMMUNICATIONS
    Type: Symposium on Electromagnetic Wave Theory; Jul 09, 1974 - Jul 12, 1974; London
    Format: text
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