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ISSN 2083-6473
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Tomasz Neumann
 

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TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
www http://www.transnav.eu
e-mail transnav@am.gdynia.pl
Assessing the Limits of eLoran Positioning Accuracy
1 Czech Technical University in Prague, Prague, Czech Republic
2 The General Lighthouse Authorities of the United Kingdom and Ireland
ABSTRACT: Enhanced Loran (eLoran) is the latest in the longstanding and proven series of low frequency, LOng-RAnge Navigation systems. eLoran evolved from Loran-C in response to the 2001 Volpe Report on GPS vulnerability. The next generation of the Loran systems, eLoran, improves upon Loran-C through enhancements in equipment, transmitted signal, 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. The Czech Technical University in Prague (CTU) participates in the eLoran research activities coordinated by the General Lighthouse Authorities of the United Kingdom and Ireland (GLAs). In our work we have focused on questions that arise when considering introducing new eLoran stations into an existing network. In particular, this paper explores the issue of Cross-Rate Interference (CRI) among eLoran transmissions and possible ways of its mitigation at the receiver end. An eLoran receiver performance model is presented and validated using an experimental eLoran signal simulator developed by a joint effort of CTU and GLAs. The resulting model is used to evaluate the achievable positioning accuracy of eLoran over the British Isles.
REFERENCES
Basker, S. et al. 2008. Enhanced Loran: real-time maritime trials. In Proceedings of Position, Location and Navigation Symposium, 2008 IEEE/ION.
Boyce, C.O.L. 2007. Atmospheric noise mitigation for LORAN. PhD thesis, Stanford University.
BS EN 61075:1993. Loran-C receivers for ships - Minimum performance standards - Methods of testing and required test results, British Standards Institution.
Hua, F. & Pooi Y. K. 2006. ML estimation of the frequency and phase in noise. In Global Telecommunications Conference, 2006. GLOBECOM '06. IEEE.
Johnson, G. et al. 2007. Navigating harbors at high accuracy without GPS: eLoran proof-of-concept on the Thames river. In Proceedings of ION National Technical Meeting, San Diego, CA, 22-24 January, 2007.
Last, D. et al. 1991. Ionospheric propagation & Loran-C range - the sky's the limit. In Proceedings of the 20th Annual Technical Symposium, Wild Goose Association, Williamsburg, VA, 1-3 October, 1991.
Pelgrum, W. 2005. Noise - from a receiver perspective. In Proceedings of the 34th Annual Convention and Technical Symposium of the International Loran Association.
Safar, J. et al. 2010. Accuracy performance of eLoran for maritime applications. Annual of Navigation, 16:109–122.
Safar, J. et al. 2009. Cross-rate interference and implications for core eLoran service provision. In Proceedings of the International Loran Association 38th Annual Meeting, Portland ME.
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Citation note:
Safar J., Vejražka F., Williams P.: Assessing the Limits of eLoran Positioning Accuracy. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 5, No. 1, pp. 93-101, 2011

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