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  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING  (6)
  • COMMUNICATIONS AND RADAR  (3)
  • Chemistry  (1)
  • SPACE RADIATION  (1)
  • 1
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    Electronic Irradiation of Foods : An Introduction to the Technology (2005)
    Boston, MA : Springer
    Details
    Keywords: Chemistry ; Food science
    ISBN: 9780387283869
    URL: https://doi.org/10.1007/0-387-28386-2
    Language: English
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    E-BOOK
  • 2
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    ISPM X-band uplink technology demonstration. Part 1: Overview (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The ground and spacecraft hardware research, design, and implementation lead to an end to end in flight technology demonstration on the International Solar Polar Mission spacecraft. An introduction to the overall effort is given and the flight experiment objectives are established. The expected improvements in the telecommunications performance are summarized. Also presented is a conceptual mission operations plant.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Telecommun. and Data Acquisition; p 50-62
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The diffuse X-ray background spectrum from 3 to 50 keV (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The spectrum of the extragalactic diffuse X-ray background has been measured with the GSFC Cosmic X-ray Experiment on HEAO 1 for regions of the sky away from known point sources and more than 20 deg from the galactic plane. A total exposure of 80 sq m-s-sr is available at present. Free-free emission from an optically thin plasma of 40 plus or minus 5 keV provides an excellent description of the observed spectrum from 3 to 50 keV. This spectral shape is confirmed by measurements from five separate layers of three independent detectors. With an estimated absolute precision of about 10%, the intensity of the emission at 10keV is 3.2 keV/keV/sq cm/s/sr, a value consistent with the average of previously reported spectra. A uniform hot intergalactic medium of approximately 36% of the closure density of the universe would produce such a flux, although nonuniform models indicating less total matter are probably more realistic.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; vol. 235
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Comparison of NAVSTAR satellite L band ionospheric calibrations with Faraday rotation measurements (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: It is pointed out that interplanetary navigation at the Jet Propulsion Laboratory (JPL) is performed by analyzing measurements derived from the radio link between spacecraft and earth and, near the target, onboard optical measurements. For precise navigation, corrections for ionospheric effects must be applied, because the earth's ionosphere degrades the accuracy of the radiometric data. These corrections are based on ionospheric total electron content (TEC) determinations. The determinations are based on the measurement of the Faraday rotation of linearly polarized VHF signals from geostationary satellites. Problems arise in connection with the steadily declining number of satellites which are suitable for Faraday rotation measurements. For this reason, alternate methods of determining ionospheric electron content are being explored. One promising method involves the use of satellites of the NAVSTAR Global Positioning System (GPS). The results of a comparative study regarding this method are encouraging.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Radio Science (ISSN 0048-6604); 19; 798-804
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Codeless GPS Applications to Multi-Path: CGAMP (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Cordless Global Positioning System (GPS) Applications to Multi-Path (CGAMP) is meeting the challenge of exploiting the L-band signals from the Global Positioning System (GPS) satellites for the measurement of the impulse response of radio transmission channels over space-Earth paths. This approach was originally suggested by E. K. Smith and has been pursued by J. Lemmon, without an affordable implementation being identifiable. In addition to the high cost of a suitable P code correlating GPS receiver, there is also the major impediment of the often announced Department of Defense policy of selective availability/anti-spoof (SA/AS) that clouds reliable access to the wideband (20 MHz) P channel of the GPS signals without cryptographic access. A technique proposed by MacDoran utilizes codeless methods for exploiting the P channel signals implemented by the use of a pair of antennas and cross correlation signal detection.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, California Inst. of Tech.,Proceedings of; JPL, California Inst
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Pioneer Venus multiprobe entry telemetry recovery (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The entry phase of the Pioneer Venus Multiprobe Mission involved data transmission over a two hour span. The criticality of recovering those two hours of data, coupled with the fact that there were no radio signals from the probes until their arrival at Venus, dictated unique telemetry recovery approaches on the ground. The result was double redundancy, use of spectrum analyzers to aid in rapid acquisition of the signals, and development of a technique for recovery of telemetry data without the use of real time coherent detection, which is normally employed for all other planetary missions.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Telecommun. and Data Acquisition Rept.; p 43-49
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Synthesis of a large communications aperture using small antennas (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In this report we compare the cost of an array of small antennas to that of a single large antenna assuming both the array and single large antenna have equal performance and availability. The single large antenna is taken to be one of the 70-m antennas of the Deep Space Network. The cost of the array is estimated as a function of the array element diameter for three different values of system noise temperature corresponding to three different packaging schemes for the first amplifier. Array elements are taken to be fully steerable paraboloids and their cost estimates were obtained from commercial vendors. Array loss mechanisms and calibration problems are discussed. For array elements in the range 3 - 35 m there is no minimum in the cost versus diameter curve for the three system temperatures that were studied.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-197330 , JPL-PUBL-94-15 , NAS 1.26:197330
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Tracking and data system support for the Pioneer project. Volume 3: Pioneer 10 from 1 April 1972 through the Jupiter encounter period, January 1974 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Tracking and Data Systems support of the Pioneer 10 mission from April 1, 1972 through the Jupiter encounter period which ended January 5, 1974 is described. The period covered involves operations in the interplanetary environment from the time of completion of the second trajectory correction to the start of Jupiter encounter; the implementation, planning, and testing that lead to the Jupiter encounter; and the operations during the 60 day encounter period.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: NASA-CR-143250 , JPL-TM-33-584-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Pioneer Venus Multiprobe entry telemetry recovery (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Entry Phase of the Pioneer Venus Multiprobe Mission involved data transmission over only a two-hour span. The criticality of recovery of those two hours of data, coupled with the fact that there were no radio signals from the Probes until their arrival at Venus, dictated unique telemetry recovery approaches on the ground. The result was double redundancy, use of spectrum analyzers to aid in rapid acquisition of the signals, and development of a technique for recovery of telemetry data without the use of real-time coherent detection which is normally employed by all other NASA planetary missions.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IEEE Transactions on Geoscience and Remote Sensing; GE-18; Jan. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Tracking and data system support for the Pioneer project. Volume 2: Pioneer 11 prelaunch planning through second trajectory correction, to 1 May 1973 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The tracking and data system support of the planning, testing, launch, near-earth, and deep space phases of the Pioneer 11 Jupiter Mission are described, including critical phases of spacecraft flight and guidance. Scientific instruments aboard the spacecraft registered information relative to interplanetary particles and fields. Knowledge of the celestial mechanics of the solar system was improved through radiometric data gathering. Network performance, details of network support activity, and special support activities are discussed.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: NASA-CR-142698 , JPL-TM-33-584-VOL-2
    Format: application/pdf
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