Extraction of Precise Information for Safe Maritime Navigation

Abstract

Currently many vessels determine an overhead obstruction by a rule of thumb based on their draft for maritime navigation. Therefore, they doesn't have a good overhead obstruction clearance because vertical position of vessels varies on time by tidal. As a result, it is occurred maritime accidents that the mainmast of vessels is bumped against overhead facilities. And disaster by global warming and rising sea levels have increased casualties. So we feel keenly the necessity of warning system for not an earthquake but freak wave such a tsunami. This paper analyzes a precise GPS ephemeris for maritime precise positioning to solve these problems. The precise GPS ephemeris provided by International GNSS service gives a difficulty to real-time application because of its sample interval. This paper proposes an interpolation method for real-time application, and it analyzes an accuracy of the interpolated coordinate through an interpolation method compare to the IGS GPS ephemeris.