Sokkia GSR2700 ISX, Руководство по эксплуатации

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Glossary
GSR2700 ISX Operations Manual 87
U
USB—
Universal Serial Bus. An external peripheral interface
standard for communication that supports data transfer rates of up to
480 Mbps.
UTC—
Universal Time Coordinated. The time as maintained by the
U.S. Naval Observatory. Due to variations in the Earth's rotation, the
UTC is sometimes adjusted by an integer second. The accumulation
of these adjustments compared to GPS time, which runs
continuously, caused a 13 second offset between GPS time and UTC
at the start of 1999. However, after accounting for leap seconds and
using adjustments contained in the navigation message, GPS time
can be related to UTC to within 20 nanoseconds or better.
W
WGS84—
The World Geodetic System 1984 is a geocentric coordinate
system designed to fit the shape of the Earth. It is often used as a
reference on a worldwide basis, while other coordinate systems are
used locally to provide a better fit to the Earth in a local region.