The Position Accuracy of DGPS Affected by the Propagation Characteristic on MF Beacon Wave

S. Okuda, Y. Arai

Abstract:	User at Inland Sea requires high position accuracy which is 5 m (2drms) or less. Especially in Japan, in addition to decrease the reliability of information from GPS satellite, there is a possibility that occurs an abnormal transmission of DGPS correction data to be affected by complex terrain or large bridge at Inland Sea. We don't resolve perfectly receiving condition which includes propagation loss, so we have to resolve receiving condition in which we cannot utilize DGPS to be high position accuracy at Inland Sea. We cannot utilize DGPS when interfering with transmission of DGPS correction data. It is considered that it’s interfere is caused by effects of increasing propagation loss as overland propagation and large structure at sea such as bridge. For the former, we have to find out regional feature of overland propagation and need to execute simulation and measurement of propagation characteristic at sea. For the latter, we need to resolve propagation characteristic for large structure. In this study, we analyze these effects and mention the reliability of navigational information sailing on narrow channel. In this paper, we summarize DGPS operation in Japan and discuss to grasp the present situation against occurrence of abnormal incident. Furthermore we research the relationship between the propagation characteristic of 300 kHz used broadcasting DGPS correction data and large bridge at Inland Sea, and we investigate the possibility to be happened an abnormal transmission of DGPS correction data by analysis for the propagation characteristic and verify the reliability of DGPS system. Even more we carried out the measurement of electric field intensity. We could obtain the results of an effect of diffraction loss, an effect of reradiation and an effect of propagation characteristic near center of bridge which does not execute such simulation.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	718 - 724
Cite this article:	Okuda, S., Arai, Y., "The Position Accuracy of DGPS Affected by the Propagation Characteristic on MF Beacon Wave," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 718-724.
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