2:15 PM - 2:30 PM
[MTT05-11] Proposal of GNSS Buoy Array in the Ocean for a Synthetic Disaster Mitigation
Keywords:GNSS, GNSS buoy, tsunami, ocean bottom crustal movement, meteorology, ionosphere
One problem of the GNSS buoy system that we have developed is the limitation of baseline distance to at most less than 20km, as the system uses so-called Real-Time Kinematic algorithm which requires a base station on land. Recent developments of real-time GNSS technology enabled us to estimate position of a moving platform like buoy in a few centimeter accuracy in real-time without a base station on land, so that the buoy is now able to be deployed at much far offshore.
Combination of precise point positioning with acoustic ranging to the ocean bottom transponder stations enables positioning of the ocean bottom station in continuous manner. Moreover, GNSS data on the buoy provide us with accurate estimation of atmospheric water vapor and total electron content in the ionosphere. These geophysical data on the ocean surface, together with land based sensors, will serve us with unprecedented invaluable datasets for better understanding of ocean bottom crustal deformation, atmospheric and ionospheric disturbances as well as sea surface disturbances. Combined this GNSS buoy technology with satellite data transmission and long-term safe and secure operation of GNSS buoy in outer ocean is a key for materializing the capability of GNSS buoy. We propose to establish an array of GNSS buoy in the Japanese EEZ area for a synthetic geodetic and geophysical infrastructure of earth science and as well as disaster mitigation.