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http://dx.doi.org/10.5394/KINPR.2010.34.8.603

Inland ASF Measurement by Signal of the 9930M Station  

Yang, Sung-Hoon (Korea Research Institute of Standards and Science)
Lee, Chang-Bok (Korea Research Institute of Standards and Science)
Lee, Jong-Koo (Korea Research Institute of Standards and Science)
Kim, Young-Jae (Korea Research Institute of Standards and Science)
Lee, Sang-Jeong (Chungnam National University)
Publication Information
Journal of Navigation and Port Research / v.34, no.8, 2010 , pp. 603-607 More about this Journal
Abstract
The LORAN system had been used widely and it was an essential navigation aid for ships in the ocean until the GPS is adopted actively. In particular, it was essential functionality for the ships to sail the oceans. According to the advancement of industry, however, the current accuracy of traditional Loran is insufficient for the utilization of harbour approach, land navigation, and the field of survey and timing. Therefore it is necessary that the study on the improvement of the positioning accuracy of Loran. The one of the improving methods is to measure and compensate the propagation time delay between the transmitter and user's receiver, which is called as additional secondary factor (ASF). In this study, we measured the ASF between the Pohang master transmitting station (9930M) and four points where locate within 33 km apart from the transmitting station, using the measuring technique of the absolute time delay without a time of coincidence (TOC) table. As the result of measurement, the ranging error caused by the propagation delay was about 210 m at 33 km, however it can be reduced up to 40 m with ASF compensation.
Keywords
Loran; ASF; TOA; propagation delay; timing accuracy; time synchronization;
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  • Reference
1 Celano T., Boiggs C. and Peterson B. (2005), “Modernized LORAN-C Timing Test Bed Status and Results”, Frequency Control Symposium and Exposition, Proceedings of the 2005 IEEE International, p. 824-829.   DOI
2 ILA (2007), “Enhanced Loran (eLoran) Definition Document”, Report Version 1.0.
3 Samaddar S. N. (1979), “The Theory of Loran-C Ground Wave Propagation –A Review”, the Journal of The Institute of Navigation, Vol. 26, No. 3, p173-187.   DOI
4 United States Coast Guard, Department of Transportation (1992), “Loran-C User Handbook", COMDPUB P16562.5.
5 국토해양부 포항광주 해상무선표지소, Korea Loran-C Chain 이용범위도 ( http://www.loran9930.go.kr/)