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The Global Navigation Satellite System (GNSS) is the generic term for satellite positioning systems, e.g., GPS (USA), QZSS (Japan), GLONASS (Russia), Galileo (EU), and BeiDou (China). GNSS is widely u...sed not only for military purposes but also for civil utilizations such as aerial/land/sea navigations. In the positioning system with GNSS, the position of each receiver is determined by specifying distances to each satellite based on the time information contained in radio waves from satellites. Recently, more accurate position information can be obtained with a combination of multiple satellites, and centimeter-class positioning has become possible. In this paper, the measuring procedure of ship motion and hull girder deformation by using GNSS is fundamentally investigated. The target ship is a Capesize bulk carrier, and five GNSS sensors are installed on board. In addition, one GNSS sensor is installed on land near the target ship as a reference station for the relative positioning. Positioning analyses based on measuring results by GNSS are performed using an open source program “RTKLIB” in this study. The results show that GNSS measurement on the order of centimeters is possible, and a ship’s inclination of several degrees can be obtained. Furthermore, it may be possible to assess the hull girder deformation due to ballast loading and/or motion in waves. The discussion on applicability of GNSS measurement for large vessels is presented in detail.続きを見る
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