A Development of Innovative Disaster Prevention System using GPS Buoy with Sea and Submarine Observation Equipment

开发了一种新的海啸观测系统，该系统采用全球定位系统技术，在海啸到达海岸之前探测到海啸。经过一系列的初步试验研究，GPS浮标系统在沿着和日本海沿岸应用，目前GPS浮标系统采用RTK（真实的时间动态）方法，需要陆基对浮标进行精确定位。这将浮标与海岸的距离限制在最多20公里。GPS定位系统的精确定位和数据的传输方法是需要解决的两个问题。在室户GPS浮标上成功地验证了PVD（Point Precise Variance Detection）法和PPP-AR（Precise Point Positioning with Ambiguity Resolution）法的算法。此外，使用QZSS（准天顶卫星系统）和ETS-VIII（工程测试卫星VIII）的卫星通信系统被引入该GPS海啸观测系统的实验。

A new tsunami observation system has been developed, which employs the GPS technology to detect a tsunami before it reaches the coast. After a series of preliminary experimental studies, the GPS buoy system is employed along the Pacific coast and Japan sea coast.Currently, the GPS buoy system uses RTK (Real Time Kinematic) method which requires land base for precise positioning of the buoy. This limits the distance of the buoy from the coast at most 20km. There are two problems to be conquered, one is the precise GPS positioning and the other is the data transmission methods. The algorithm of PVD (Point precise Variance Detection) method and PPP-AR (Precise Point Positioning with Ambiguity Resolution) method are successfully under examination in the Muroto GPS buoy. Also, the satellite communication system using QZSS (Quasi-Zenith Satellite System) and ETS-VIII (Engineering Test Satellite VIII) were introduced for this GPS tsunami observation system experimentally.