Moore, Hill and Monteiro (see Proceedings of the 5th. GNSS International Symposium, Seville, 2001) presented the benefits of DGPS for mariners, namely in terms of accuracy and integrity, and showed that the option to embrace DGPS was, and is, still valid because it can provide the best accuracy and integrity at sea. However, the accuracy advantage afforded and the integrity check performed by DGPS are only useful if the DGPS service reaches very high standards of availability and continuity. It would be almost useless to have a DGPS service with low availability and continuity, because it could mean a ship losing the differential corrections in restricted waters, where the service is most needed. In summary, the level of benefit gained from DGPS is directly proportional to the user availability of the service and to its continuity. This paper covers issues related to availability and continuity (continuity replaced the previously used concept of reliability). The availability and continuity requirements adopted by the International Maritime Organization (IMO) and the International Association of Lighthouse Authorities (IALA) are presented, as well as the ways by which DGPS services can meet the very high requirements for the harbour entrance and approach phase of navigation. The concepts used in the Portuguese DGPS network to minimize downtime and ensure the highest reliability and availability, are presented as an example.


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    Titel :

    Maritime DGPS: ensuring the best availability and continuity


    Beteiligte:
    Moore, T. (Autor:in) / Hill, C. (Autor:in) / Monteiro, L.S. (Autor:in)

    Erschienen in:

    The Journal of Navigation ; 55 , 3 ; 485-494


    Erscheinungsdatum :

    2002


    Format / Umfang :

    10 Seiten, 7 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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