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  • 11
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    Preliminary Comparison of Two-Way Satellite Time and Frequency Transfer and GPS Common-View Time Transfer During the INTELSAT Field Trial (1996)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: For a decade and a half Global Positioning System (GPS) common-view time transfer has greatly served the needs of primary timing laboratories for regular intercomparisons of remote atomic clocks. However, GPS as a one-way technique has natural limits and may not meet all challenges of the comparison of the coming new generation of atomic clocks. Two-way satellite time and frequency transfer (TWSTFT) is a promising technique which may successfully complement GPS. For two years, regular TWSTFT's have been performed between eight laboratories situated in both Europe and North America, using INTELSAT satellites. This has enabled an extensive direct comparison to be made between these two high performance time transfer methods. The performance of the TWSTFT and GPS common view methods are compared over a number of time-transfer links. These links use a variety of time-transfer hardware and atomic clocks and have baselines of substantially different lengths. The relative merits of the two time-transfer systems are discussed.
    Schlagwort(e): Physics (General)
    Materialart: 27th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting; 347-358; NASA-CP-3334
    Format: application/pdf
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  • 12
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    Some Operational Aspects of the International Two-Way Satellite Time and Frequency Transfer (TWSTFT) Experiment Using INTELSAT Satellites at 307 Degrees East (1996)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Eight laboratories are participating in an international two-way satellite time and frequency transfer (TWSTFT) experiment. Regular time and frequency transfers have been performed over a period of almost two years, including both European and transatlantic time transfers. The performance of the regular TWSTFT sessions over an extended period has demonstrated conclusively the usefulness of the TWSTFT method for routine international time and frequency comparisons. Regular measurements are performed three times per week resulting in a regular but unevenly spaced data set. A method is presented that allows an estimate of the values of delta (sub y)(gamma) to be formed from these data. In order to maximize efficient use of paid satellite time an investigation to determine the optimal length of a single TWSTFT session is presented. The optimal experiment length is determined by evaluating how long white phase modulation (PM) instabilities are the dominant noise source during the typical 300-second sampling times currently used. A detailed investigation of the frequency transfers realized via the transatlantic TWSTFT links UTC(USNO)-UTC(NPL), UTC(USNO)-UTC(PTB), and UTC(PTB)-UTC(NPL) is presented. The investigation focuses on the frequency instabilities realized, a three cornered hat resolution of the delta (sub y) (gamma) values, and a comparison of the transatlantic and inter-European determination of UTC(PTB)-UTC(NPL). Future directions of this TWSTFT experiment are outlined.
    Schlagwort(e): Physics (General)
    Materialart: 27th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting; 335-345; NASA-CP-3334
    Format: application/pdf
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  • 13
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    Mars Observer: Planetary Constants and Model (1999)
    In:  Other Sources
    Details
    Publikationsdatum: 2018-06-08
    Beschreibung: The value of EOT in degrees is usually converted to solar-minutes to give the correction to mean solar time to obtain true solar time. The value of EOT for Mars over the Mars Observer mapping phase is plotted.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Format: text
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  • 14
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    Synergistic Airframe-Propulsion Interactions and Integrations: A White Paper Prepared by the 1996-1997 Langley Aeronautics Technical Committee (1998)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: This white paper addresses the subject of Synergistic Airframe-Propulsion interactions and integrations (SnAPII). The benefits of SnAPII have not been as extensively explored. This is due primarily to the separateness of design process for airframes and propulsion systems, with only unfavorable interactions addressed. The question 'How to design these two systems in such a way that the airframe needs the propulsion and the propulsion needs the airframe?' is the fundamental issue addressed in this paper. Successful solutions to this issue depend on appropriate technology ideas. This paper first details some ten technologies that have yet to make it to commercial products (with limited exceptions) and that could be utilized in a synergistic manner. Then these technologies, either alone or in combination, are applied to both a conventional twin-engine transonic transport and to an unconventional transport, the Blended Wing Body. Lastly, combinations of these technologies are applied to configuration concepts to assess the possibilities of success relative to five of the ten NASA aeronautics goals. These assessments are subjective, but they point the way in which the applied technologies could work together for some break-through benefits.
    Schlagwort(e): Aeronautics (General)
    Materialart: NASA/TM-1998-207644 , NAS 1.15:207644 , L-17723
    Format: application/pdf
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  • 15
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    Historical annotated bibliography: Space Station documents (1988)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Information is presented regarding documentation which has been produced in the Space Station program. This information will enable the researcher to locate readily documents pertinent to a particular study. It is designed to give the historian the necessary data from which to compile the written histories and to preserve records of historically significant aspects of Marshall's involvement in Space Shuttle and Space Station.
    Schlagwort(e): GENERAL
    Materialart: NASA-CR-184012 , NAS 1.26:184012 , MHR-13
    Format: application/pdf
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  • 16
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    Chronology: MSFC Space Shuttle program development, assembly, and testing major events (1969 - April, 1981) (1988)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Listings of major events directly related to the Space Shuttle Program at Marshall Space Flight Center (MSFC) are presented. This information will provide the researcher with a means of following the chronological progression of the program. The products that the historians have prepared are intended to provide supportive research essential to the writing of formal narrative histories of Marshall's contributions to the Space Shuttle and Space Station.
    Schlagwort(e): GENERAL
    Materialart: NASA-CR-184013 , NAS 1.26:184013 , MHR-15
    Format: application/pdf
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  • 17
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    Chronology: MSFC Space Station program, 1982 - present. Major events (1988)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The Marshall Space Flight Center (MSFC) maintains an active program to capture historical information and documentation on the MSFC's roles regarding Space Shuttle and Space Station. Marshall History Report 12, called Chronology: MSFC Space Station Program, 1982-Present, is presented. It contains synopses of major events listed according to the dates of their occurrence. Indices follow the synopses and provide additional data concerning the events listed. The Event Index provides a brief listing of all the events without synopses. The Element Index lists the specific elements of the Space Station Program under consideration in the events. The Location Index lists the locations where the events took place. The indices and synopses may be cross-referenced by using dates.
    Schlagwort(e): GENERAL
    Materialart: NASA-CR-184014 , NAS 1.26:184014 , MHR-12
    Format: application/pdf
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  • 18
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    Criteria for Grasar Action in Astrophysical Sources (1983)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-10
    Beschreibung: The theory of gamma ray amplification through stimulated annihilation radiation (grasar) was developed by Ramaty, McKinley and Jones. For gamma ray bursts similar to the March 5, 1979 burst, an observed annihilation line of width 0.03 MeV would imply a grasar source. The minimum pair density needed for the onset of grasar action is approx. 10 to the 30th power/cu cm and the peak of the grasar line, without a gravitational redshift, is at 0.5 MeV.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA(Goddard Space Flight Center Contrib. to the Workshop on Positron-Electron Pairs in Astrophys.; p 63-67
    Format: text
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  • 19
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    Circulation Control in NASA's Vehicle Systems (2005)
    In:  CASI
    Details
    Publikationsdatum: 2018-06-11
    Beschreibung: Specific to the application of any technology to a vehicle, such as circulation control, it is important to understand the process that NASA is using to set its direction in research and development. To see how circulation control fits into any given NASA program requires the reader to understand NASA's Vehicle Systems (VS) Program. The VS Program recently celebrated its first year of existence with an annual review - an opportunity to look back on accomplishments, solicit feedback, expand national advocacy and support for the program, and recognize key contributions. Since its formation last year, Vehicle Systems has coordinated seven existing entities in a streamlined aeronautics research effort. It invests in vehicle technologies to protect the environment, make air travel more accessible and affordable for Americans, enable exploration through new aerospace missions, and augment national security. This past year has seen a series of valuable partnerships with industry, academia, and government agencies to make crucial aeronautics advances and assure America s future in flight.
    Schlagwort(e): Administration and Management
    Materialart: Proceedings of the 2004 NASA/ONR Circulation Control Workshop, Part 1; 1-35; NASA/CP-2005-213509/PT1
    Format: application/pdf
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  • 20
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    Mars Observer Mission Operations (1989)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Mars Observer, planned for launch in September 1992, will be the first deep space planetary mission to fully utilize a distributed operations concept for science instrument control. In addition, several of the other concepts proposed by the Mission Operations and Information Systems Subcommittee of the Solar System Exploration Committee have been adopted for the purpose of improving the efficiency and reducing the costs of Deep Space Mission Operations.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: AIAA PAPER 89-0257
    Format: text
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