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  • 1
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    Scattering Effects of Solar Panels on Space Station Antenna Performance (1994)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: Characterizing the scattering properties of the solar array panels is important in predicting Space Station antenna performance. A series of far-field, near-field, and radar cross section (RCS) scattering measurements were performed at S-Band and Ku-Band microwave frequencies on Space Station solar array panels. Based on investigation of the measured scattering patterns, the solar array panels exhibit similar scattering properties to that of the same size aluminum or copper panel mockup. As a first order approximation, and for worse case interference simulation, the solar array panels may be modeled using perfect reflecting plates. Numerical results obtained using the Geometrical Theory of Diffraction (GTD) modeling technique are presented for Space Station antenna pattern degradation due to solar panel interference. The computational and experimental techniques presented in this paper are applicable for antennas mounted on other platforms such as ship, aircraft, satellite, and space or land vehicle.
    Keywords: Communications and Radar
    Type: Dual-Use Space Technology Transfer Conference and Exhibition; Volume 1; 67-73; NASA-CP-3263-Vol-1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Computer Analysis of Electromagnetic Field Exposure Hazard for Space Station Astronauts during Extravehicular Activity (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In order to estimate the RF radiation hazards to astronauts and electronics equipment due to various Space Station transmitters, the electric fields around the various Space Station antennas are computed using the rigorous Computational Electromagnetics (CEM) techniques. The Method of Moments (MoM) was applied to the UHF and S-band low gain antennas. The Aperture Integration (AI) method and the Geometrical Theory of Diffraction (GTD) method were used to compute the electric field intensities for the S- and Ku-band high gain antennas. As a result of this study, The regions in which the electric fields exceed the specified exposure levels for the Extravehicular Mobility Unit (EMU) electronics equipment and Extravehicular Activity (EVA) astronaut are identified for various Space Station transmitters.
    Keywords: Aerospace Medicine
    Type: NASA-CR-202587 , NAS 1.26:202587 , AIAA Paper 95-1049 , Life Sciences and Space Medicine; Apr 03, 1995 - Apr 05, 1995; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The electromagnetic environment at S- and Ku-band frequencies for the Space Station Freedom (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The purpose of this paper is to quantify the electric field strength around the Space Station Assembly/Contingency Subsystem (ACS) S-band conical horn antenna and the Space-to-Ground Subsystem (SGS) Ku-band 6-ft diameter reflector antenna. The regions in which the electric fields exceed the specified maximum permitted RF exposure of the Extravehicular Mobility Unit electronics equipment and EVA astronaut are identified for the Space Station ACS S-band conical horn antenna and the SGS Ku-band 6-ft diameter reflector antenna, respectively. The scattering effects of a flat metal plate, a representative Space Station structural element, were also examined. It was shown that the reflected waves from the reflecting structure cause both destructive and constructive interference of the electric fields in the intersection region between the incident and reflected waves.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 93-0571 , AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States|; 6 p.
    Format: text
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    NASA TECHNICAL REPORTS
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