Study on GPS Application to Draught Measuring System on Board

Shigeyuki Okuda, and Yas Uo Arai

Abstract:	Generally speaking, multi-path signal affects to decrease the quality of receiving signal for data communication according to a bad influence on direct receiving signal for data communication. So designers, developers and researchers of GPS receiver, antenna and software have been making their efforts to remove multi-path signal. For the ship, in the case of measurement of wave height on board and/or on sailing, in rare case a few mariners measure using experimental equipment, but in actually many mariners observe wave height by their eyes. In the case of measurement of draught, the draught gauge is developed using super sonic as remote display equipment for large vessels, but in general they read out from draught marks on hull side or stern of ship. Both measurements are at mooring or anchoring, so it is impossible to measure on sailing. We consider constructing the measuring system of draught and/or wave height by utilizing multi-path signal effectively. The proposal system in this paper is able to get wave height analytically from GPS signal. Such as draught and/or wave height measurement on board, it is possible to remove the personal error of measurement because of mechanical and automatically measurements by this proposal system against measuring items by eyes. Also in land application it is possible to construct the automatic system by this proposal method for measurement of water level meter of rivers and/or dams and wave gauge or tide gauge at harbor area. We used the experiment system and we executed the verification experiment on land condition, so we could confirm that the proposal system would have a possibility of realization. It had a problem for clock, and when it was able to remove some multi-path signal except ideal one time reflection signal, which was used effectively, measurement accuracy achieved same as pseudorange differential GPS system. If at the Rover Station using common clock with the Reference Station’s one, then we could confirm that reflection signal would get range difference of each satellite.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	740 - 745
Cite this article:	Okuda, Shigeyuki, Arai, Yas Uo, "Study on GPS Application to Draught Measuring System on Board," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 740-745.
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