Abstract
We tried to evaluate the adaptability of RTK-GPS to future construction of an ultra large scale floating steel structure, named 'Mega-Float', by the analysis of the acquired data on a very-large-scale model. The standard deviation of short term variation in each direction is less than 1cm. It is smaller than the nominal accuracy of the receiver and seems to be a measure of the amplitude of the oscillation. The deviation in vertical direction increases with the increase of significant wave height. Those in the other directions also reflect wave height variation. Noise level inferred from many patterns of temporal variation of the calculated positions is less than 1 or 2mm. Although when determining the absolute position, the noise level may reach the order of the nominal value mentioned above, due to drift and jump of the calculated positions, it is ensured that only RTK-GPS has an enough accuracy for the offshore construction of such a huge floating structure.
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