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  • 1
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    Combinatorial communication - A new interpretation of a basic combinatorial formula (1966)
    In:  CASI
    Details
    Publication Date: 2009-07-19
    Description: Combinatorial communication - interpretation of basic combinatorial formula
    Keywords: COMMUNICATIONS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A METHOD FOR PREDICTING THE EFFICIENCY OF SOLAR CELL POWER SYSTEMS OUTSIDE THE EARTH'S ATMOSPHERE (1962)
    In:  CASI
    Details
    Publication Date: 2008-08-25
    Description: Efficiency of solar cell power systems outside the earths atmosphere
    Keywords: COMMUNICATIONS
    Type: JPL-TR-32-259
    Format: text
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  • 3
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    The analysis of uncooperative radar targets, chapter 3 (1966)
    In:  CASI
    Details
    Publication Date: 2011-10-14
    Description: Modulation and detection processes for analysis of uncooperative radar targets
    Keywords: COMMUNICATIONS
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    NASA TECHNICAL REPORTS
  • 4
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    Methods for obtaining velocity and range information from CW radars, chapter 18 (1966)
    In:  CASI
    Details
    Publication Date: 2011-10-14
    Description: Methods for obtaining velocity and range information from continuous wave radars
    Keywords: COMMUNICATIONS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Antenna drive system for the Nimbus satellite (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A two-axis drive system is described for pointing a high gain antenna. Motion about each axis is provided by identical drive mechanisms. Only three gear passes are required to obtain the necessary 900:1 gear reduction. The drive system is a primary element of an experiment that will provide a real time data link between Nimbus and ground stations. Data are transmitted from Nimbus to the applications technology satellite, which relays the data to ground stations.
    Keywords: COMMUNICATIONS
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 117-120
    Format: text
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  • 6
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    The Intelsat 4 antenna positioner (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The Intelsat 4 communications satellite has two spot beam antennas which are pointed to selected land masses by gimbaled positioners. The positioners employ drive motors with electromagnetic brakes and jackscrews that are self-caging during the launch. The positioner uses dry lubricants for ball bearings, spur gears, screw and nut, and various journal bearings. A coefficient of friction of approximately 0.05 was demonstrated in vacuum operation. Success of the positioner was demonstrated on the first Intelsat 4 placed in orbit in January 1971. The developmental problems that were encountered and their solutions are discussed.
    Keywords: COMMUNICATIONS
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 109-116
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  • 7
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    Locations of solar radio bursts (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Measurements of the positions of the sources of solar radio bursts at decameter wavelengths, 20- to 60-MHz range, provide information about physical conditions in a region of the corona extending from about one-half to several solar radii from the surface of the sun. Position measurements in the 20- to 60-MHz range were made with the Clark Lake sweep-frequency grating interferometer. Although the resolution of the instrument is sufficient to measure source position accurately, the highly variable effect of refraction in the earth's ionosphere severely limits the observations, distorting position determinations to such an extent as to make much of the position data useless unless ionospheric refraction can be taken into account. A method was developed for the removal of the refractive effect from the data to permit determination of true source position. With this technique it is considered possible to measure spatial extent of radio sources that will provide information about emission processes and physical parameters in the corona.
    Keywords: COMMUNICATIONS
    Type: Significant Accomplishments in Sci., 1970; p 149-153
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  • 8
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    Reduction of near-in sidelobes using phase reversal aperture rings (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A technique is described for reducing near-in sidelobes in spacecraft antennas by cancellation. This technique takes a small portion of the radiation from the antenna aperture and generates the near-in lobes, which are then fed out of phase relative to the main signal. Results of sample cases indicate that the first three lobes can be nearly eliminated at a 40% reduction in aperture efficiency.
    Keywords: COMMUNICATIONS
    Type: JPL Quart. Tech. Rev., Vol. 1, No. 4; p 34-42
    Format: text
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  • 9
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    Electromagnetic compatibility fundamentals applied to spacecraft radio communication systems (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A design guide for minimizing electromagnetic interference in aerospace communication equipment for ground stations is presented. Specifically treated are the mechanisms of generating unwanted radio emissions that may affect station operations as well as other communications services, the mechanisms by which sensitive receivers become susceptible to interference, means for reducing interference, standard methods of measurement, and the problems of site selection. The sources of interference are viewed primarily as originating from communications transmitters aboard spacecraft and aircraft, ground transmitters within and outside the ground stations, and other electrical sources on the ground that are not intended to radiate.
    Keywords: COMMUNICATIONS
    Type: NASA. Goddard Space Flight Center Radio Freq. Interference Handbook; p 1-106
    Format: text
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  • 10
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    Experiment T001: Entry communication on the Gemini 3 mission (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Water addition to the Gemini 3 exhaust plasma was studied to determine its effectiveness in the establishment of communication links during the entry portion of the flight. Attenuation levels were measured with and without water injection at uhf frequencies of 230.4 and 296.8 megahertz and at the C-band frequency of 5690 megahertz. Ultrahigh frequency signals that had been blacked out were restored to significant levels, during early portions of the water-injection sequence, by the high flow rate injection. The C-band signal was enhanced by medium and high flow rate injections during the latter portion of the injection period. The uhf signal recovered during water injection resulted in an antenna pattern that was beamed in the radial direction of injection from the spacecraft. Postflight analysis showed that the uhf recovery data were consistent with injection-penetration theory.
    Keywords: COMMUNICATIONS
    Type: The Gemini Porgram: Phys. Sci. Expt. Sum.; p 471-485
    Format: text
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