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  • COMMUNICATIONS AND RADAR  (5)
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  • 1
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    Box truss antenna technology status (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Recent technology development activities for box truss structures and box truss antennas are summarized. Three primary activities are discussed: the development of an integrated analysis system for box truss mesh antennae; dynamic testing to characterize the effect of joint free play on the dynamic behavior of box truss structures; and fabrication of a 4.5 meter diameter offset fed mesh reflector integrated to an all graphite epoxy box truss cube.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA. Langley Research Center NASA(DOD Control)Structures Interaction Technology, 1986; p 145-148
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Integrated analysis system for box truss antenna mesh performance (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An integrated analysis system has been developed to more efficiently design and analyze the mesh reflective surface and the mesh tie system of the box truss antenna. Six integrated computer programs using nonlinear finite-element, surface topography and interpolation, and RF aperture integration techniques, analyze the effects of manufacturing errors, mesh pillowing, and operating environment on antenna performance. The level of rigor of analysis can be varied, providing the possibility of a lower cost preliminary study on various designs using a minimum number of reduced box section models. By including the random and systematic errors with the aperture integration of minimum rms reflector surface roughness, the RF Performance Solver determines the far-field pattern, including the beam efficiency, and thus the antenna performance of the mesh reflector antenna.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 86-0663
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The 15-meter diameter mechanically scanned deployable antenna (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A preliminary design with structural model data and thermal-performance estimates of a 15-meter mechanically scanned deployable antenna (MSDA) that could be launched onboard a Shuttle Orbiter to provide radiometric brightness temperature maps of the Earth and oceans in selected bands over a frequency range from 1.4 to 11 GHz is provided. The study objectives were met through the design of a unique, integrated, offset feed mast and reflector design that uses the deployable box-truss structure as a building block. The performance of this system is summarized. The all graphite-epoxy, 4.57-meter prototype cube that was completed in 1981 and is proposed for this reflector and feed mast design is presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-170576 , NAS 1.26:170576 , MCR-82-1307
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Satellite voice broadcast. Volume 2: System study (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Technical Volume of the Satellite Broadcast System Study is presented. Designs are synthesized for direct sound broadcast satellite systems for HF-, VHF-, L-, and Ku-bands. Methods are developed and used to predict satellite weight, volume, and RF performance for the various concepts considered. Cost and schedule risk assessments are performed to predict time and cost required to implement selected concepts. Technology assessments and tradeoffs are made to identify critical enabling technologies that require development to bring technical risk to acceptable levels for full scale development.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-175017 , NAS 1.26:175017 , MTR-85-556-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Satellite voice broadcast. Volume 1: Executive summary (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An Executive Summary of the Satellite Voice Broadcast System Study designs are synthesized for direct sound broadcast satellite systems for HF-, VHF-, and Ku-bands. Methods are developed and used to predict satellite weight, volume, and RF performance for the various concepts considered. Cost and schedule risk assessments are performed to predict time and cost required to implement selected concepts. Technology assessments and tradeoffs are made to identify critical enabling technologies that require development to bring technical risk to acceptable levels for full scale development.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-175016 , NAS 1.26:175016
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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