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  • 1
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    (Table 1) Properties of grab sampled sediments from the Nha Trang Bay
    PANGAEA
    In:  Supplement to: Udalov, S S; Britaev, T A; Than, N T H (2006): Features of the soft-bottom subtidal macrobenthos in Nha Trang Bay (Vietnam, South China Sea). Oceanology, 46(4), 483-491, https://doi.org/10.1134/S0001437006040059
    Details
    Publication Date: 2023-05-12
    Description: General characteristics of macrobenthos of muddy sediments of the subtidal (19-24 m) zone in the Nha Trang Bay (South Vietnam) were described based on the survey performed in April-May 2002. The mean abundance of organisms was 637 ind/m**2 and the mean biomass was 2.3 g/m**2. Sixty-seven macrobenthic species were found during the study. The main structural features of the macrobenthos were high species diversity, low species recurrence, and high evenness of species structure with the absence of clearly manifested dominants. The number of species encountered regularly increased with the increase in the total area sampled from 210 to 5000 cm**2, though the relation did not reach saturation. Similarities and differences between the macrobenthos structures in the Nha Trang Bay and those in some tropical and boreal soft-bottom communities are discussed.
    Keywords: a2; a3; a4; a5; Archive of Ocean Data; ARCOD; Benthos; Carbon, organic, total; Elevation of event; Event label; Grab; GRAB; Grain size, mean; Latitude of event; Longitude of event; Size fraction 〈 0.050 mm; South China Sea
    Type: Dataset
    Format: text/tab-separated-values, 14 data points
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    DATA PANGAEA
  • 2
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    Digital TV tri-state delta modulation system for Space Shuttle ku-band downlink (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A tri-state delta modulation/demodulation (TSDM) technique which provides for efficient run-length coding of constant-intensity segments of a TV picture is described. Aspects of the hardware implementation of a high-speed TSDM transmitter and receiver for black-and-white TV or field-sequential color or NTSC format color are reviewed. Run-length encoding of the TSDM output can consistently reduce the required channel data rate well below one bit per sample. As compared with a bistate delta modulation system, the present technique eliminates granularity in the reconstructed video without degrading rise or fall times. About 40 chips are used by TSDM when used to handle the luminance information in a color link. A possible overall space and ground functional configuration to accommodate Shuttle digital TV with scrambling for privacy is presented.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Engineering evaluations and studies. Volume 3: Exhibit C (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: High rate multiplexes asymmetry and jitter, data-dependent amplitude variations, and transition density are discussed.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-171727 , NAS 1.26:171727 , R8310-6-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Engineering evaluations and studies. Volume 2: Exhibit B, part 2 (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Preliminary shuttle/Centaur communication system analysis and shuttle global positioning system investigations are discussed. Television digitizer development is also discussed.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-171726 , NAS 1.26:171726 , R8310-6-VOL-2-PT-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Engineering evaluations and studies. Volume 1: Exhibit A (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Orbiter inertial upper-stage studies, ku-band hardware studies, S-band hardware investigations, shuttle/Centaur communication system engineering investigations are provided.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-171724 , NAS 1.26:171724 , R8310-6-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Engineering evaluations and studies. Volume 2: Exhibit B, part 1 (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Ku-band communication system analysis, S-band system investigations, payload communication investigations, shuttle/TDRSS and GSTDN compatibility analysis are discussed.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-171725 , NAS 1.26:171725 , R8310-6-VOL-2-PT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Ranging/tracking system for proximity operations (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The hardware development and testing phase of a hand held radar for the ranging and tracking for Shuttle proximity operations are considered. The radar is to measure range to a 3 sigma accuracy of 1 m (3.28 ft) to a maximum range of 1850 m (6000 ft) and velocity to a 3 sigma accuracy of 0.03 m/s (0.1 ft/s). Size and weight are similar to hand held radars, frequently seen in use by motorcycle police officers. Meeting these goals for a target in free space was very difficult to obtain in the testing program; however, at a range of approximately 700 m, the 3 sigma range error was found to be 0.96 m. It is felt that much of this error is due to clutter in the test environment. As an example of the velocity accuracy, at a range of 450 m, a 3 sigma velocity error of 0.02 m/s was measured. The principles of the radar and recommended changes to its design are given. Analyses performed in support of the design process, the actual circuit diagrams, and the software listing are included.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-167636 , NAS 1.26:167636 , R8206-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Space Shuttle program communication and tracking systems interface analysis (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Space Shuttle Program Communications and Tracking Systems Interface Analysis began April 18, 1983. During this time, the shuttle communication and tracking systems began flight testing. Two areas of analysis documented were a result of observations made during flight tests. These analyses involved the Ku-band communication system. First, there was a detailed analysis of the interface between the solar max data format and the Ku-band communication system including the TDRSS ground station. The second analysis involving the Ku-band communication system was an analysis of the frequency lock loop of the Gunn oscillator used to generate the transmit frequency. The stability of the frequency lock loop was investigated and changes to the design were reviewed to alleviate the potential loss of data due the loop losing lock and entering the reacquisition mode. Other areas of investigation were the S-band antenna analysis and RF coverage analysis.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-171862 , NAS 1.26:171862 , AXIOMATRIX-8409-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    IUS/payload communication system simulator configuration definition study (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The requirements and specifications for a general purpose payload communications system simulator to be used to emulate those communications system portions of NASA and DOD payloads/spacecraft that will in the future be carried into earth orbit by the shuttle are discussed. For the purpose of on-orbit checkout, the shuttle is required to communicate with the payloads while they are physically located within the shuttle bay (attached) and within a range of 20 miles from the shuttle after they have been deployed (detached). Many of the payloads are also under development (and many have yet to be defined), actual payload communication hardware will not be available within the time frame during which the avionic hardware tests will be conducted. Thus, a flexible payload communication system simulator is required.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-151620 , R7801-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Integrated source and channel encoded digital communication system design study (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Various aspects of space shuttle communication systems were studied. The following major areas were investigated: burst error correction for shuttle command channels; performance optimization and design considerations for Costas receivers with and without bandpass limiting; experimental techniques for measuring low level spectral components of microwave signals; and potential modulation and coding techniques for the Ku-band return link. Results are presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-141779 , R7504-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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