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  • COMMUNICATIONS  (238)
  • 2020-2020
  • 1970-1974  (238)
  • 1
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    The Apollo Lunar Sounder radar system (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The objectives of the Apollo 17 Lunar Sounder Experiment (ALSE) were to detect subsurface geologic structures, to generate a continuous lunar profile, and to image the moon at radar wavelengths. A three-wavelength synthetic-aperture radar (SAR) operating at 60, 20, and 2 m wavelengths was designed to attain these objectives. The design choices reflected a balance of scientific requirements versus Apollo mission and hardware constraints. The radar data from the lunar mission were recorded on photographic film in a conventional SAR format, and were returned to earth for processing. A combination of optical and digital processing and exploitation techniques was applied to the scientific interpretation of the data. Some preliminary results from the lunar mission have been obtained.
    Keywords: COMMUNICATIONS
    Type: IEEE; vol. 62
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Interactive display/graphics systems for remote sensor data analysis (1970)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A color-television display system and interactive graphics equipment on-line to an IBM 360/44 computer are used to develop a variety of interactive displays which aid in analyzing remote sensor data. These interactive displays are used to: (1) analyze data from a multispectral scanner; (2) develop automatic pattern recognition systems based on multispectral scanner measurements; and (3) analyze data from non-imaging sensors such as the infrared radiometer and microwave scatterometer.
    Keywords: COMMUNICATIONS
    Type: Its 3d Ann. Earth Resources Program Rev., Vol. 2; p 19
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A system for analysis and classification of voice communications (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for analysis and classification of verbal communications typically associated with manned space missions or simulations was developed. The study was carried out in two phases. Phase 1 was devoted to identification of crew tasks and activities which require voice communication for accomplishment or reporting. Phase 2 entailed development of a message classification system and a preliminary test of its feasibility. The classification system permits voice communications to be analyzed to three progressively more specific levels of detail and to be described in terms of message content, purpose, and the participants in the information exchange. A coding technique was devised to allow messages to be recorded by an eight-digit number.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-128837
    Format: application/pdf
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  • 4
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    Communicating with outer-planet spacecraft (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Mariner 1969 communication system modified for thermoelectric outer planet spacecraft /TOPS/, noting X band addition to S band and associated problems
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 5
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    Coherent absorption in a homogeneously broadened medium (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Short light pulse coherent absorption in homogeneously broadened resonant medium, discussing influence of input pulse area and atomic coherence on propagation properties
    Keywords: COMMUNICATIONS
    Type: ; TROPHYSICAL JOURNAL
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Observations of noise bands associated with the upper hybrid resonance by the Imp 6 radio astronomy experiment. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The intense noise bands occurring near the upper hybrid resonance frequency have been observed with the Imp 6 GSFC radio astronomy experiment in the plasmasphere. The identification of the upper hybrid resonance provides an accurate measure of the local electron density and allows the observed noise data to be fit to the scale of characteristic frequencies in the plasma. The data are consistent with earlier theoretical interpretations in which noise is generated between the upper hybrid and plasma frequencies and propagates to region 4 of the CMA diagram, where it is reflected at the L = 0 plasma cutoff.
    Keywords: COMMUNICATIONS
    Type: Journal of Geophysical Research; 78; Apr. 1
    Format: text
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  • 7
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    Compression and error correction for TV (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Data compression and error correcting codes applied to digital transmission of real time, standard format TV, along with voice and other data from Apollo spacecraft
    Keywords: COMMUNICATIONS
    Type: NASA. Manned Spacecraft Center Proc. of the Space Shuttle Integrated Electron. Conf., Vol. 2; p 311-328
    Format: application/pdf
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  • 8
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    Design study for a high reliability five-year spacecraft tape transport (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Following the establishment of the overall transport concept, a study of all of the life limiting constraints associated with the transport were analyzed using modeling techniques. These design techniques included: (1) a response analysis from which the performance of the transport could be determined under operating conditions for a variety of conceptual variations both in a new and aged condition; (2) an analysis of a double cone guidance technique which yielded an optimum design for maximum guidance with minimum tape degradation; (3) an analysis of the tape pack design to eliminate spoking caused by negative tangential stress within the pack; (4) an evaluation of the stress levels experienced by the magnetic tape throughout the system; (5) a general review of the bearing and lubrication technology as applied to satellite recorders and hence the recommendation for using standard load carrying antifriction ball bearings; and (6) a kinetic analysis to determine the change in kinetic properties of the transport during operation.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-122453
    Format: application/pdf
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  • 9
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    A variable-step-size robust delta modulator. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Description of an analytically obtained optimum adaptive delta modulator-demodulator configuration. The device utilizes two past samples to obtain a step size which minimizes the mean square error for a Markov-Gaussian source. The optimum system is compared, using computer simulations, with a linear delta modulator and an enhanced Abate delta modulator. In addition, the performance is compared to the rate distortion bound for a Markov source. It is shown that the optimum delta modulator is neither quantization nor slope-overload limited. The highly nonlinear equations obtained for the optimum transmitter and receiver are approximated by piecewise-linear equations in order to obtain system equations which can be transformed into hardware. The derivation of the experimental system is presented.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communication Technology; COM-19; Dec. 197
    Format: text
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  • 10
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    Real-time compression and transmission of Apollo telemetry data (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Real time Apollo PCM telemetry data compression and transmission using zero order predictor
    Keywords: COMMUNICATIONS
    Type: ; YSICA STATUS SOLIDI
    Format: text
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