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  • Aircraft Communications and Navigation  (5)
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  • 1
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    Highlights of Recent Developments in the International GPS Service and Perspectives for Future Directions (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: In December 1998, the IGS Governing Board officially changed the name of this IAG service from 'International GPS Service for Geodynamics to simply the 'International GPS Service'. This change of name reflects the fact that today the IGS supports numerous scientific projects outside the traditional geodetic and geodynamic disciplines. A number of IGS projects and working groups have been established, each concentrating on a particular science application, such as the ionosphere, atmosphere, reference frame, precise time transfer, etc. These activities are enabled and simulated by the IGS and directly contribute to the continuing development of the service. The IGS is currently poised to respond to evolving user requirements that focus on timeliness and reliability of data and products, particularly in support of a slate of Low Earth Orbiter missions over the next decade. Perspectives on the future of the IGS will be developed based on current directions as well as anticipated external influences, such as GPS satellite modernization, GLONASS, availability of global communications, and plans for the European GALILEO (Global Navigation Satellite System - GNSS). We will address development of user friendly interfaces and IGS product tutorials.
    Keywords: Aircraft Communications and Navigation
    Type: Birmingham; United Kingdom
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Breadth of Scientific Activities and Network Station Specifications in the International GPS Service (IGS) (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: A strong multipurpose aspect of the International GPS Service (IGS) is revealed by a glance at the titles of current projects and working groups within the IGS: IGS/BIPM Time Transfer Project; Ionosphere Working Group; Troposphere Working Group; International GLONASS Experiment; Working Group on Low-Earth Orbiter Missions; and Tide Gauges, CGPS, and the IGS. The IGS network infrastructure, in large part originally commissioned for geodynamical investigations, has proved to be a valuable asset in developing application-oriented subnetworks whose requirements overlap the characteristics of existing IGS stations and future station upgrades. Issues encountered thus far in the development of multipurpose or multitechnique IGS projects as well as future possibilities will be reviewed.
    Keywords: Aircraft Communications and Navigation
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    International GPS Service for Geodynamics (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This 1995 annual report of the IGS International GPS (Global Positioning System) Service for Geodynamics - describes the second operational year of the service. It provides the many IGS contributing agencies and the rapidly growing user community with essential information on current organizational and technical matters promoting the IGS standards and products (including organizational framework, data processing strategies, and statistics showing the remarkable expansion of the GPS monitoring network, the improvement of IGS performance, and product quality). It also introduces important practical concepts for network densification by integration of regional stations and the combination of station coordinate solutions. There are groups of articles describing general aspects of the IGS, the Associate Analysis Centers (AACs), Data Centers, and IGS stations.
    Keywords: Aircraft Communications and Navigation
    Type: NASA/CR-96-112602 , NAS 1.26:112602 , JPL-Publ-96-18
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    IGS 1996 Analysis Center Workshop (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Components of the IGS[International GPS (Global Positioning System) Service for geodynamics], have operated a GPS tracking system for several years. The network now contains more than 100 stations and has produced a combined GPS ephemeris that has become the standard for geodesists and geophysicists worldwide. IGS data and products are freely available to all thanks to the cooperation and participation of all the IGS members. The IGS has initiated development of several new products, and technical issues permitting greater accuracy of IGS products have been identified. The IGS convened a workshop on March 1996 in Silver Spring, Maryland, USA, to coordinate these developments and to examine technical problems and solutions. The following topics were addressed: orbit/clock combination; Earth orientation; antenna calibration; SINEX and densification of the International Terrestrial Reference Frame (ITRF) using the GPS; receiver standards and performance; and atmospheric topics.
    Keywords: Aircraft Communications and Navigation
    Type: NASA/CR-96-112599 , JPL-Publ-96-23 , NAS 1.26:112599 , IGS 1996 Analysis Center Workshop; Mar 19, 1996 - Mar 21, 1996; Silver Spring, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    International GPS (Global Positioning System) Service for Geodynamics (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The International GPS (Global Positioning System) Service for Geodynamics (IGS) began formal operation on January 1, 1994. This first annual report is divided into sections, which mirror different aspects of the service. Section (1) contains general information, including the history of the IGS, its organization, and the global network of GPS tracking sites; (2) contains information on the Central Bureau Information System; (3) describes the International Earth Rotation Service (IERS); (4) details collecting and distributing IGS data in Data Center reports; (6) describes how the IGS Analysis Centers generate their products; (7) contains miscellaneous contributions from other organizations that share common interests with the IGS.
    Keywords: Aircraft Communications and Navigation
    Type: NASA/CR-97-112582 , JPL-Publ-95-18 , NAS 1.26:112582
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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