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observation observation correlation processing correlation
data analysis data
collocation collocation
The GSI VLBI group mainly performs three kinds of operations: observation, correlation processing, and data analysis. We obtain the precise positions on Earth and Earth rotation aspect through correlating and analyzing data by regularly performing VLBI observations.

Additionally "collocation" works are performed in a planned manner. It is to measure the relative position between a VLBI antenna and its adjacent geodetic control point, reflecting precisely measured antenna position data by VLBI.
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