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  • Other Sources  (116)
  • COMMUNICATIONS AND RADAR  (61)
  • MECHANICAL ENGINEERING  (55)
  • Analytical Chemistry and Spectroscopy
  • Cell & Developmental Biology
  • 1980-1984  (116)
  • 1960-1964
  • 1950-1954
  • 1905-1909
  • 1983  (116)
  • 1952
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  • 1980-1984  (116)
  • 1960-1964
  • 1950-1954
  • 1905-1909
Year
  • 1
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    Tracking antenna arrays for near-millimeter waves (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A two-dimensional monolithic array has been developed that gives the elevation and azimuth of point source targets. The array is an arrangement of rows and columns of antennas and bismuth bolometer detectors on a fused quartz substrate. Energy is focused onto the array through a lens placed on the back side of the substrate. At 1.38 mm with a 50 mm diameter objective lens, the array has demonstrated a positioning accuracy of 26 arcmin. In a differential mode this precision improves to 9 arcsec, limited by the mechanics of the rotating stage. This tracking could be automated to a fast two-step procedure where a source is first located to the nearest row and column, and then precisely located by scanning. With signal processing the array should be able to track multiple sources.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); AP-31; May 1983
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Radio Interferometric Determination of Source Positions, Intercontinental Baselines, and Earth Orientation with Deep Space Network Antennas: 1971 to 1980 (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-10
    Description: Approximately 2400 observations of extragalactic radio sources were made between August 1971 and February 1980 during 48 separate sessions. These consisted of 259 delay rate observations at 2.3 GHz (S-band), 796 delay and delay rate observations at either S-band of 8.3 GHz (X-band) and 1325 delay and delay rate observations recorded simultaneously at both S- and X-band. A single multiparameter fit has been applied to the observed values of delay and delay rate to extract astrometric and geophysical parameters from this decade-long sequence. The fit produced estimates of 784 parameters, including station locations, radio source positions, polar motion, Universal Time, the precession constant, and solid earth tides. The a priori model included gravitational bending, the 1980 IAU nutation series, the 1976 IAU expressions for Greenwich mean sidereal time and precession, BIH estimates of Universal Time and polar motion, and monthly mean values for zenith troposphere delay. The rms residuals were 0.52 nsec for delay and 0.30 psec/sec for delay rate. Intercontinental baseline lengths were determined with formal uncertainties of 5 to 10 cm. Universal Time and polar motion were measured at 49 epochs, with formal uncertainties (for the more recent data) of 0.5 msec for UT1 and 6 and 2 mas, respectively, for the X and Y components of polar motion.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommun. and Data Acquisition Rept.; p 128-155
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Weather data communication and utilization (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The communication of weather data to aircraft is discussed. Problems encountered because of the great quantities of data available and the limited capacity to transfer this via radio link to an aircraft are discussed. Display devices are discussed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA. Langley Research Center Controls, Displays and Inform. Transfer for Gen. Aviation IFR Operations; p 201-210
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Double arch mirror study (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of a method of mounting light weight glass mirrors for astronomical telescopes compatible with the goals of the Shuttle Infrared Telescope Facility (SIRTF) was investigated. A 20 in. diameter double arch lightweight mirror previously fabricated was modified to use a new mount configuration. This mount concept was developed and fabricated. The mounting concept of the double mounting mirror is outlined. The modifications made to the mirror, fabrication of the mirror mount, and room temperature testing of the mirror and mount and the extension of the mirror and mount concept to a full size (40 in. diameter) primary mirror for SIRTF are discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-166589 , NAS 1.26:166589
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Double arch mirror study. Part 1: Preliminary engineering report (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In the proposed design, the NASA AMES 20-in double arch mirror is supported by three clamp and flexure assemblies. The mirror clamp consists of a T-shaped Invar-36 member that goes into a similarly shaped socket in the back of the mirror. The mirror socket is made oversize and contacts the clamp only along the conical surface. The clamp is preloaded by a spring washer and pulls the mirror into contact with the flexure. The clamp is then inserted into the mirror socket through a cutout, is rotated 90 deg, and is then pinned in place. Loading conditions considered in socket design are discussed as well as stress in the socket and clamp. Flexure geometry and stress are examined as well as the effects of flexure error and of mirror cell error.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-166589-PT-1 , NAS 1.26:166589-PT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Phased-array-fed antenna configuration study. Volume 1: Technology assessment (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The status of the technologies for phased-array-fed dual reflector systems is reviewed. The different aspects of these technologies, including optical performances, phased array systems, problems encountered in phased array design, beamforming networks, MMIC design and its incorporation into waveguide systems, reflector antenna structures, and reflector deployment mechanisms are addressed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-168231 , NAS 1.26:168231
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Space applications of Automation, Robotics And Machine Intelligence Systems (ARAMIS). Volume 3, phase 2: Executive summary (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The field of telepresence is defined, and overviews of those capabilities that are now available, and those that will be required to support a NASA telepresence effort are provided. Investigation of NASA's plans and goals with regard to telepresence, extensive literature search for materials relating to relevant technologies, a description of these technologies and their state of the art, and projections for advances in these technologies are included. Several space projects are examined in detail to determine what capabilities are required of a telepresence system in order to accomplish various tasks, such as servicing and assembly. The key operational and technological areas are identified, conclusions and recommendations are made for further research, and an example developmental program leading to an operational telepresence servicer is presented.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-3736 , NAS 1.26:3736 , SSL-32-83-VOL-3-PHASE-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Customer premise service study for 30/20 GHz satellite system (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Satellite systems in which the space segment operates in the 30/20 GHz frequency band are defined and compared as to their potential for providing various types of communications services to customer premises and the economic and technical feasibility of doing so. Technical tasks performed include: market postulation, definition of the ground segment, definition of the space segment, definition of the integrated satellite system, service costs for satellite systems, sensitivity analysis, and critical technology. Based on an analysis of market data, a sufficiently large market for services is projected so as to make the system economically viable. A large market, and hence a high capacity satellite system, is found to be necessary to minimize service costs, i.e., economy of scale is found to hold. The wide bandwidth expected to be available in the 30/20 GHz band, along with frequency reuse which further increases the effective system bandwidth, makes possible the high capacity system. Extensive ground networking is required in most systems to both connect users into the system and to interconnect Earth stations to provide spatial diversity. Earth station spatial diversity is found to be a cost effective means of compensating the large fading encountered in the 30/20 GHz operating band.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-167986 , NAS 1.26:167986 , GE-83SDS4206
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Space Applications of Automation, Robotics and Machine Intelligence Systems (ARAMIS), phase 2. Volume 2: Telepresence project applications (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The field of telepresence is defined and overviews of those capabilities that are now available, and those that will be required to support a NASA telepresence effort are provided. Investigation of NASA' plans and goals with regard to telepresence, extensive literature search for materials relating to relevant technologies, a description of these technologies and their state of the art, and projections for advances in these technologies over the next decade are included.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-3735 , NAS 1.26:3735 , SSL-31-83
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Space Applications of Automation, Robotics and Machine Intelligence Systems (ARAMIS), phase 2. Volume 1: Telepresence technology base development (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The field of telepresence is defined, and overviews of those capabilities that are now available, and those that will be required to support a NASA telepresence effort are provided. Investigation of NASA's plans and goals with regard to telepresence, extensive literature search for materials relating to relevant technologies, a description of these technologies and their state of the art, and projections for advances in these technologies over the next decade are included. Several space projects are examined in detail to determine what capabilities are required of a telepresence system in order to accomplish various tasks, such as servicing and assembly. The key operational and technological areas are identified, conclusions and recommendations are made for further research, and an example developmental program is presented, leading to an operational telepresence servicer.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-3734 , NAS 1.26:3734 , SSL-30-83
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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