Abstract
Intensive work in recent years has demonstrated the value of high precision and high temporal resolution in collecting Earth rotation data, paving the way for continuous measurement that will open exciting new research areas in geophysics as the new millennium unfolds. Very long baseline interferometry (VLBI) will continue to be a principal technique. However, it will have greatly improved precision and temporal resolution, making possible more in‐depth studies of geophysical phenomena affecting Earth rotation. Originally developed as a radio astronomical technique for high‐resolution mapping of distant radio sources, VLBI, when “turned around,” has become a valuable tool in geodesy. Because of its past success, a new VLBI project, Continuous Observation of the Rotation of the Earth (CORE), was launched last year. It is being implemented in phases by the NASA Goddard Space Flight Center in collaboration with the U.S. Naval Observatory (USNO) [see Ma et al., 1997].
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