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  • 1
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    Determination and evaluation of rate measurements in the analysis of space medical data. (1967)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-11
    Beschreibung: Rate measurements determination and evaluation in analysis of space medical data
    Schlagwort(e): BIOTECHNOLOGY
    Materialart: MULTIVARIATE BEHAVIORAL RESEARCH
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 2
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    S-band antenna measurements for manned flight on the Apollo program (1969)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: S-band omnidirectional antenna patterns measurement procedure and results for Apollo spacecraft configurations, tabulating measure gains
    Schlagwort(e): ELECTRONIC EQUIPMENT
    Materialart: ; TROPHYSICAL JOURNAL
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Computer utilization of time-line medical data from man in space flight (1965)
    In:  CASI
    Details
    Publikationsdatum: 2019-05-24
    Beschreibung: Time-line medical data computer program for manned space flights
    Schlagwort(e): BIOSCIENCES
    Materialart: NASA-TN-D-2695
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Computer utilization of time-line medical data from man in space flight. (1965)
    In:  Other Sources
    Details
    Publikationsdatum: 2018-12-01
    Beschreibung: NASA Medical Data Program and development of time-line medical data for computer evaluation of man in space flight
    Schlagwort(e): COMPUTERS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 5
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    Space shuttle engineering and operations support. Isolation between the S-band quad antenna and the S-band payload antenna. Engineering systems analysis (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The isolation between the upper S-band quad antenna and the S-band payload antenna on the shuttle orbiter is calculated using a combination of plane surface and curved surface theories along with worst case values. A minimum value of 60 db isolation is predicted based on recent antenna pattern data, antenna locations on the orbiter, curvature effects, dielectric covering effects and edge effects of the payload bay. The calculated value of 60 db is significantly greater than the baseline value of 40 db. Use of the new value will result in the design of smaller, lighter weight and less expensive filters for S-band transponder and the S-band payload interrogator.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA-CR-147835 , REPT-1.2-DN-B0503-006
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Multiple dielectric layer effects on the space shuttle orbiter S-band quad antennas (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A mathematical tool is developed for evaluation of antenna radiation pattern effects on the shuttle orbiter S band quad antennas. A ray optics approach is used which includes multiple internal reflections with special consideration to reflection from the metallic orbiter skin. Significant depolarization may occur as the angle from the normal increases. The effect of changing tile thickness on the beamwidth of the upper quads versus the lower quads results in a small increase in the lower quad beamwidth compared with the beamwidth in the upper quads. The optimization and evaluation of the S band quads and the computer tool developed may be used to evaluate other shuttle orbiter antennas.
    Schlagwort(e): SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Materialart: NASA-CR-147771
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    Tracker implementation for the orbiter Ku-band communications antenna (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Possible implementations and recommendations for the Space Shuttle Ku-Band integrated communications/radar antenna tracking system were evaluated. Communication aspects involving the Tracking Data Relay Satellite (TDRS)/Orbiter Ku-Band link are emphasized. Detailed analysis of antenna sizes, gains and signal-to-noise ratios shows the desirability of using maximum size 36-inch diameter dish and a triple channel monopulse. The use of the original baselined 20 inch dish is found to result in excessive acquisition time since the despread signal would be used in the tracking loop. An evaluation of scan procedures which includes vehicle dynamics, designation error, time for acquisition and probability of acquisition shows that the conical scan is preferred since the time for lock-on for relatively slow look angle rates will be significantly shorter than the raster scan. Significant improvement in spherical coverage may be obtained by reorienting the antenna gimbal to obtain maximum blockage overlap.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: NASA-CR-150992 , DN-B0603-007
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 8
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    Shuttle orbiter C-band beacon antenna location study (1975)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A recommendation for the location of the Space Shuttle C-Band Beacon Antenna(s) to be used during Approach and Landing Tests was made. The study has included an Orbiter-to-ground radar look angle evaluation, a vehicle shadowing evaluation and extensive 1/10-scale antenna pattern measurements. Locations were limited to the cutouts for the S-Band Quads and Hemis to minimize skin perturbation. The results show that a single C-Band Antenna located in the lower Hemi cutout will provide optimum coverage and eliminate the need for switching and the undesirable interferometer effects of two antennas.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: NASA-CR-147673 , REPT-1.2-DN-B0203-003
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 9
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    Shuttle orbiter S-band quad antenna switching evaluation (1975)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Automatic switching of the shuttle orbiter S-band quad antennas by the orbiter on-board computers was evaluated. The development and use of an extensive computer program to determine antenna switch position states as a function of time for various orbital activities is described. The selection of the optimum quad antenna element at any given time is based on the look angle to the appropriate Tracking Data Relay Satellite (TDRS). It is shown that a 2.4 second period is required for updating the S-band quad antenna switch state based on a maximum roll rate of 2 deg per second. The possibility of a variable update period is suggested since the 2 deg per second attitude rate is seldom encountered and would, for example, dictate approximately 248,000 on-board computer calculations during Reference Mission 2. The average number of antenna switch state changes was found to be in the range of 1,300 for Reference Mission 2.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: NASA-CR-147672 , REPT-1.2-DN-B0203-001
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 10
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    Limitations on Ku-band communications due to multipath (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The earth and orbiter body reflections involving the Tracking Data Relay Satellite (TDRS)/orbiter communications link are evaluated. Recommendations address operational conditions in order to avoid critical multipath impacts, modulation preferences during acquisition, and preferred scan limit implementation.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: NASA-CR-151490 , DN-1.2-DN-B0703-008
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
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