ACCURACY PERFORMANCE OF ELORAN FOR MARITIME APPLICATIONS

Jan Safar, Kebasenotse Caspar Lebekwe, Paul Williams

    Research output: Contribution to journalArticle

    Abstract

    E-Loran, or enhanced Loran, is the latest in the longstanding and proven series of low fre-
    quency, LOng-RAnge Navigation systems. eLoran evolved from Loran-C in response to the
    2001 Volpe Report on GPS vulnerability. It improves upon previous Loran systems with
    updated equipment, signals, and operating procedures. The improvements allow eLoran to
    provide better performance and additional services when compared to Loran-C, and enable
    eLoran to serve as a backup to satellite navigation in many important applications.
    Different applications impose specific requirements on the navigation system’s accuracy,
    availability, integrity and continuity performance. In the maritime sector, accuracy require-
    ments are the most stringent. In order to comply with the requirements of the International
    Maritime Organisation (IMO) for harbour entrance approach, eLoran has to provide an accuracy
    of better than 10 m (95%).Achieving this target is possible if the eLoran navigation receiver is equipped with an up-to-date
    database of signal propagation corrections and if real-time differential Loran corrections are
    applied. When these conditions are met, the achievable accuracy is largely determined by the
    transmitters’ geometry, signal strengths and atmospheric noise levels, but also by the mutual
    interference among eLoran stations. This is also referred to as Cross-Rate Interference (CRI)
    and is inherent to the way all Loran systems operate.
    In this paper we present results of the eLoran research that is being conducted at the Czech
    Technical University in Prague (CTU) and the University of Bath (UK) in cooperation with
    the General Lighthouse Authorities of the United Kingdom and Ireland. In our work we have
    focused on questions that arise when considering introducing new eLoran stations into an
    existing network. This particular paper investigates the achievable accuracy performance of
    eLoran for maritime applications. The sources of measurement error in eLoran are reviewed,
    and an eLoran accuracy performance model is presented. Special attention is paid to the
    problem of CRI and possible ways of its mitigation.
    Original languageEnglish
    Pages (from-to)109-121
    JournalAnnual of Navigation
    Volume16
    Publication statusPublished - 2010

    Fingerprint

    Navigation systems
    Navigation
    Lighthouses
    Ports and harbors
    Measurement errors
    Global positioning system
    Transmitters
    Availability
    Satellites
    Geometry

    Cite this

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    abstract = "E-Loran, or enhanced Loran, is the latest in the longstanding and proven series of low fre-quency, LOng-RAnge Navigation systems. eLoran evolved from Loran-C in response to the 2001 Volpe Report on GPS vulnerability. It improves upon previous Loran systems with updated equipment, signals, and operating procedures. The improvements allow eLoran to provide better performance and additional services when compared to Loran-C, and enable eLoran to serve as a backup to satellite navigation in many important applications. Different applications impose specific requirements on the navigation system’s accuracy, availability, integrity and continuity performance. In the maritime sector, accuracy require-ments are the most stringent. In order to comply with the requirements of the International Maritime Organisation (IMO) for harbour entrance approach, eLoran has to provide an accuracy of better than 10 m (95{\%}).Achieving this target is possible if the eLoran navigation receiver is equipped with an up-to-date database of signal propagation corrections and if real-time differential Loran corrections are applied. When these conditions are met, the achievable accuracy is largely determined by the transmitters’ geometry, signal strengths and atmospheric noise levels, but also by the mutual interference among eLoran stations. This is also referred to as Cross-Rate Interference (CRI) and is inherent to the way all Loran systems operate. In this paper we present results of the eLoran research that is being conducted at the Czech Technical University in Prague (CTU) and the University of Bath (UK) in cooperation with the General Lighthouse Authorities of the United Kingdom and Ireland. In our work we have focused on questions that arise when considering introducing new eLoran stations into an existing network. This particular paper investigates the achievable accuracy performance of eLoran for maritime applications. The sources of measurement error in eLoran are reviewed, and an eLoran accuracy performance model is presented. Special attention is paid to the problem of CRI and possible ways of its mitigation.",
    author = "Jan Safar and Lebekwe, {Kebasenotse Caspar} and Paul Williams",
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    ACCURACY PERFORMANCE OF ELORAN FOR MARITIME APPLICATIONS. / Safar, Jan; Lebekwe, Kebasenotse Caspar; Williams, Paul.

    In: Annual of Navigation, Vol. 16, 2010, p. 109-121.

    Research output: Contribution to journalArticle

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