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http://dx.doi.org/10.5394/KINPR.2011.35.8.619

ASF Measurements on Maritime by the Signal of the Pohang Loran-C (9930M)  

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)
Hwang, Sang-Wook (Chungnam National University)
Lee, Sang-Jeong (Chungnam National University)
Yang, Sung-Hoon (Korea Research Institute of Standards and Science)
Publication Information
Journal of Navigation and Port Research / v.35, no.8, 2011 , pp. 619-624 More about this Journal
Abstract
A significant factor limiting the ranging accuracy of Loran (Long Range Navigation) signal is the additional secondary factor (ASF) in the time of arrival (TOA) measurements. Precise ASF values are essential if Loran deliver the high absolute accuracies demanded for aircraft approach, maritime harbour entrance. We measured the absolute propagation delay between Pohang Loran signal and Loran receiver output signal by comparing with Cesium atomic clock. In this study we measured ASFs between Pohang 9930M station and the 12 measurement points in the Yeongil Bay by using the measurement technique of absolute time delay. The measurement points were spaced at interval of 3 km by 3 km. An E-field antenna and an H-field antenna were used to improve the accuracy of ASF measurements and a DGPS (Differential GPS) receiver was used for accurate positions. We have gotten the result that the measured ASFs were compared with the predicted ASFs through this measurement technique.
Keywords
Loran; ASF; propagation delay; accuracy; maritime measurement;
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