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[B-10.2.1 Positioning of Tide Gauge by VLBI and GPS]

[Contact Person]

Takashi SAITO
Head, Satellite Geodetic Division
Geodetic Observation Center, Geographical Survey Institute
Ministry of Construction
Kitasato-1, Tsukuba-shi, Ibaraki 305, Japan
Tel:+81-298-64-1111 (ex.8631), Fax:+81-298-64-1802
E-mail: takasi-saitou@gsi-mc.go.jp

[Total Budget for FY1993-FY1995]

55,017,000 Yen (FY1995; 17,214,000 Yen)

[Abstract]

　Models used for prediction of the sea level change should be updated through comparison with observational evidences. This investigation focuses on an absolute measurement of the variation of the ocean surface.
　The sea surface change is measured by the tide gauges fixed on the earth crust; the crustal movement is determined by the space geodetic technologies as referred to the center of mass of the earth. The combination of the technologies give us the true sea surface change. We use the Very Long Baseline Interferometry (VLBI) and Global Positioning System (GPS) as the space technologies. The current bottle neck of the VLBI is the poor mobility. In this investigation, a down-sized VLBI is developed for the easy VLBI observation near the tide gauge. On the other hand, the GPS permanent network is established by GSI to monitor the crustal movement all over Japan. In this year, we use the VLBI and the GPS network to measure the movement of the tide gauges.
　We established some precise control points nearby the tide gauges by this research. The points are connected to the terrestrial reference system. We can monitor the movement of the tide gauges using VLBI and GPS network that is operated by GSI.

[Key Words]

Global Warming, Sea Level Change, VLBI, GPS, Tide Gauge