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  • COMMUNICATIONS  (68)
  • 2020-2024
  • 2010-2014
  • 1970-1974  (68)
  • 1955-1959
  • 1945-1949
  • 1973  (68)
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Years
  • 2020-2024
  • 2010-2014
  • 1970-1974  (68)
  • 1955-1959
  • 1945-1949
Year
  • 1
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    Technology requirements for post-1985 communications satellites (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The technical and functional requirements for commercial communication satellites are discussed. The need for providing quality service at an acceptable cost is emphasized. Specialized services are postulated in a needs model which forecasts future demands. This needs model is based upon 322 separately identified needs for long distance communication. It is shown that the 1985 demand for satellite communication service for a domestic region such as the United States, and surrounding sea and air lanes, may require on the order of 100,000 MHz of bandwith. This level of demand can be met by means of the presently allocated bandwidths and developing some key technologies. Suggested improvements include: (1) improving antennas so that high speed switching will be possible; (2) development of solid state transponders for 12 GHz and possibly higher frequencies; (3) development of switched or steered beam antennas with 10 db or higher gain for aircraft; and (4) continued development of improved video channel compression techniques and hardware.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-114679
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Doppler compensation by shifting transmitted object frequency within limits (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A system and method are disclosed for position locating, deriving centralized air traffic control data, and communicating via voice and digital signals between a multiplicity of remote aircraft, including supersonic transports, and a central station. Such communication takes place through a synchronous satellite relay station. Side tone ranging patterns, as well as the digital and voice signals, are modulated on a carrier transmitted from the central station and received on all of the supersonic transports. Each aircraft communicates with the ground stations via a different frequency multiplexed spectrum. Supersonic transport position is derived from a computer at the central station and supplied to a local air traffic controller. Position is determined in response to variable phase information imposed on the side tones at the aircrafts. Common to all of the side tone techniques is Doppler compensation for the supersonic transport velocity.
    Keywords: COMMUNICATIONS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Combined observations of meteors by image-orthicon television camera and multi-station radar (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Observations from multiple sites of a radar network and by television of 29 individual meteors from February 1969 through June 1970 are reported. Only 12 of the meteors did not appear to fragment over all the observed portion of their trajectories. From these 12, the relation for the radar magnitude to the panchromatic absolute magnitude was found in terms of velocity of the meteor. A very tentative fit to the data on the duration of long enduring echoes versus visual absolute magnitude is made. The exponential decay characteristics of the later parts of several of the light curves are pointed out as possible evidence of mutual coalescence of droplets into which the meteoroid has completely broken.
    Keywords: COMMUNICATIONS
    Type: NASA, Washington Evolutionary and Phys. Properties of Meteoroids; p 23-44
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Feasibility model of a high reliability five-year tape transport, volume 2 (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Analysis of the design features of the modularized tape transport renders a life expectancy in excess of five years. Tests performed on the tape transport were directed toward determining its performance capability. These tests revealed that the tape jitter and skew are in the range achieved by high quality digital tape transports. Guidance of the tape in the lateral sense by the use of the two hybrid crowned rollers proved to be excellent. Tracking was maintained within less than one thousandth inch (approximately 2 micrometers). The guidance capability demonstrated makes possible the achievement of the performance objective of 7.2 x 10 to the 9th power storage capability employing 1500 ft. of one inch wide tape with a packing density of 5,000 bits per inch per track on 80 tracks. Also, the machine showed excellent characteristics operating over a wide range of tape speeds. The basic design concept lends itself to growth and adaptation to a wide range of recorder requirements.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-132898
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    An adaptive array for interference rejection. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An experimental adaptive array based on the feedback concept discussed by Widrow et al. (1967) is considered. The processing procedure described makes it possible to discriminate between 'desired' and 'undesired' signals by means of a reference signal. The application of this approach to the problem of interference rejection in radio communications is investigated. The reference signal in this case can only approximate the desired signal. A description is given of a number of experiments in which the desired signal is a modulated signal and the reference signal is a CW signal at the desired signal carrier frequency.
    Keywords: COMMUNICATIONS
    Type: IEEE; vol. 61
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Tracking and data system support for the Pioneer project. Volume 1: Pioneer 10-prelaunch planning through second trajectory correction, 4 December 1969 - 1 April 1972 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The tracking and data system support of the launch, near-earth, and deep space phases of the Pioneer 10 mission, which sent a Pioneer spacecraft into a flyby of Jupiter that would eventually allow the spacecraft to escape the solar system is discussed. The support through the spacecraft's second trajectory correction is reported. During this period, scientific instruments aboard the spacecraft registered information relative to interplanetary particles and fields, and radiometric data generated by the network continued to improve knowledge of the celestial mechanics of the solar system. In addition to network support activity detail, network performance and special support activities are covered.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-131373 , JPL-TM-33-584-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Multimegabit Operation Multiplexer System (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Multimegabit Operation Multiplexer System (MOMS) is a high-data-rate PCM telemetry unit capable of sampling and encoding 60 scanning radiometer and four vidicon channels at 250 kilosamples/second and 5 megasamples/second, respectively. This sampling capacity plus the seven-bit quantization requires a total throughput rate of 40 megasamples/second and 280 megabits/second. To produce these rates efficiently, the system was divided into a pair of identical 140-megabit blocks. A low-power 20-MHz analog multiplexer and analog-to-digital converter were developed together with a video sample-and-hold that features an aperture time error of less than 50 psec. Breadboard testing of these basic building blocks confirmed the design prediction that the total system would consume 27 watts of power. Two 140-megabit output parts are suitable for quadriphase modulation.
    Keywords: COMMUNICATIONS
    Type: International Telemetering Conference; Oct 09, 1973 - Oct 11, 1973; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Television experiment (1973)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The fixed and variable Martian features investigated by the TV experiment on Mariner 9 are described. Articles are presented concerning the dust storm of October to November over the Southern Hemisphere; global surface geodesy and cartography; geology; and the satellite astronomy.
    Keywords: COMMUNICATIONS
    Type: Mariner Mars 1971 Proj., Vol. 5; p 63-70
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Vibration resistance of the wire-feed mechanism of a magnetic recording apparatus (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The effects of external mechanical and climatic actions on the efficient operation of magnetic tape recording equipment are analyzed. The efficiency and reliability of the recording system are determined by the structural parameters and the characteristics of the individual elements of the transport mechanism circuit. The resistance of tape recording equipment to the effects of vibration is considered essential for reliable operations. Methods for insuring reliable tape transport and recording action are discussed.
    Keywords: COMMUNICATIONS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 271-274
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Measurement of irregularities in angular velocities of rotating assemblies in memory devices on magnetic carriers (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Problems in measurement of irregularities in angular velocity of rotating assemblies in memory devices with rigid and flexible magnetic data carriers are discussed. A device and method for determination of change in angular velocities in various frequency and rotation rate ranges are examined. A schematic diagram of a photoelectric sensor for recording the signal pulses is provided. Mathematical models are developed to show the amount of error which can result from misalignment of the test equipment.
    Keywords: COMMUNICATIONS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 279-282
    Format: text
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