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  • Other Sources  (7)
  • NASA Technical Reports  (7)
  • 1985-1989  (2)
  • 1975-1979  (5)
  • 1
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    Attitude and articulation control concepts for the Earth Observing System (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A study of pointing requirements and control approaches for the Earth Observing System, EOS, is presented. The proposed instrument set includes several massive instruments with varied articulation requirements, and pointing control requirements in several cases tighter than 0.01 degrees. Approaches to multipayload control and stability are explored, including: (a) the use of interconnected but dynamically isolated payload modules on a large platform, each with independent inertial control, and (b) precision basebody control of smaller platforms, with momentum compensated articulation and on-orbit dynamic balancing of spin-scan instruments. Results from multibody spacecraft models highlight potential payload dynamic interaction problems and suggest the need for dynamic isolation and disturbance rejection control techniques.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AAS PAPER 85-436
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Multiplexed fiber-optic transmission system (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Digital, audio, and video data channels spanning 100 megahertz bandwidth are transmitted via single fiber-optical link. System is flexible by virtue of its plug-in modularity and optical patchboard that allows it to adjust to data and bandwidth changes.
    Keywords: ELECTRONIC SYSTEMS
    Type: KSC-11047 , NASA Tech Briefs (ISSN 0145-319X); 2; 2; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Fiber optic multiplex optical transmission system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A multiplex optical transmission system which minimizes external interference while simultaneously receiving and transmitting video, digital data, and audio signals is described. Signals are received into subgroup mixers for blocking into respective frequency ranges. The outputs of these mixers are in turn fed to a master mixer which produces a composite electrical signal. An optical transmitter connected to the master mixer converts the composite signal into an optical signal and transmits it over a fiber optic cable to an optical receiver which receives the signal and converts it back to a composite electrical signal. A de-multiplexer is coupled to the output of the receiver for separating the composite signal back into composite video, digital data, and audio signals. A programmable optic patch board is interposed in the fiber optic cables for selectively connecting the optical signals to various receivers and transmitters.
    Keywords: OPTICS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Earth observing system instrument pointing control modeling for polar orbiting platforms (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An approach to instrument pointing control performance assessment for large multi-instrument platforms is described. First, instrument pointing requirements and reference platform control systems for the Eos Polar Platforms are reviewed. Performance modeling tools including NASTRAN models of two large platforms, a modal selection procedure utilizing a balanced realization method, and reduced order platform models with core and instrument pointing control loops added are then described. Time history simulations of instrument pointing and stability performance in response to commanded slewing of adjacent instruments demonstrates the limits of tolerable slew activity. Simplified models of rigid body responses are also developed for comparison. Instrument pointing control methods required in addition to the core platform control system to meet instrument pointing requirements are considered.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: AIAA PAPER 87-0022
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Fiber-optic crossbar switch (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Switch automatically crosspatches optical signals with little loss. Device is furnished with local control and remote control. Local control can be manual from control panel or by computer data bus. In remote control, switch is slaved to remote manual panel computer data bus.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: KSC-11104 , NASA Tech Briefs (ISSN 0145-319X); 4; 1; P. 9
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Assessment of a solar photovoltaic power conversion system for central station application (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-162221 , EM-342-294
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Fiber optic multiplexed optical transmission systems for space vehicle launch facilities (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Low loss Fiber Optic Cable is being evaluated as a potential future replacement for Kennedy Space Center's 13,000 mile Wideband cable system. In order to make economical use of the wide bandwidth characteristic of glass fibers, a Frequency Division Multiplexing (FDM) scheme has been devised to stack many analog and digital data channels on a single fiber. The Multiplexed Optical Transmission System (MOTS) will offer a unique flexibility of plug-in modularity to meet changing data and bandwidth requirements in addition to the standard 'goodies' of immunity to lightning and other EMI, RFI type interferences, and of smaller size and lighter weight.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Guided optical communications; August 19, 20, 1975; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
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