Abstract: | User at the Inland Sea requires high position accuracy which is 5 m (2drms) or less. Therefore the position accuracy of standalone GPS is insufficiency. Consequently it needs to use DGPS for navigator sailing the Inland Sea. Decreased reliability of fixed position using GPS means that the reliability of GPS signal information decreases and there is a possibility of abnormal propagation of DGPS correction data signal, and such case occurs in the Inland Sea. In this paper, we research as part of investigating received condition in the Inland Sea, but sailing circumstance in Europe and the Great Lakes have common receiving condition same as the Inland Sea. The main subject is to analyze the propagation characteristic of DGPS correction data signal. We executed numerical simulation of the propagation characteristic on the extended line of bridge pier at opposite side from DGPS station, and already confirmed that bit error in DGPS correction data signal occurs, and that correction data could not form by bit error. In this paper, we carried out numerical simulation of the propagation characteristic of DGPS correction data signal received at sailing through center of the bridge, and solved receiving condition of DGPS correction data signal before and after passing through the bridge. This simulation calculated a variation of signal strength by composition of superior reflection wave and surface wave. Around under the bridge reflection wave of bridge girder become to be superior and signal strength increases because it is combined with surface wave. After passing through the bridge, signal strength increases and decreases according to combined phase because reflection wave from the bridge is combined with surface wave. Furthermore, we investigated validity of numerical simulation and effects of oversea and/or overland propagation by checking the result of electric field intensity measurement at the Inland Sea. |
Published in: |
Proceedings of the 2012 International Technical Meeting of The Institute of Navigation January 30 - 1, 2012 Marriott Newport Beach Hotel & Spa Newport Beach, CA |
Pages: | 1383 - 1420 |
Cite this article: | Okuda, S., Arai, Y., Toba, M., "The Propagation Characteristic of DGPS Correction Data Signal in Japan - Propagation Characteristic Near Big Bridge," Proceedings of the 2012 International Technical Meeting of The Institute of Navigation, Newport Beach, CA, January 2012, pp. 1383-1420. |
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