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Acutime 2000 Synchronization Kit User Guide Glossary-7
Glossary
GPS Global Positioning System. A satellite-based navigation
system operated and maintained by the U.S. Department of
Defense and consisting of a constellation of 24 satellites
providing worldwide, 24-hour, three-dimensional (3-D)
GPS coverage. These satellites transmit signals used (by
GPS receivers) to determine precise location (position,
velocity, and time) solutions. GPS signals are available in all
weather conditions. This system also includes 5 monitor
ground stations, 1 master control ground station, and 3
upload ground stations.
GPS is emerging as the technology of choice in many timing
applications, including site and network synchronization.
GPS antenna An antenna designed to receive GPS radio navigation
signals.
GPS processor An electronic device that interprets the GPS radio
navigation signals (received by a GPS antenna) and
determines a location solution. The GPS processor may also
be able to apply (and determine) differential GPS
corrections.
GPS receiver The combination of a GPS antenna and a GPS processor.
GPS time The length of the second is fixed and is determined by
primary atomic frequency standards. Leap-seconds are not
used, as they are in UTC. Therefore, GPS time and UTC
differ by a variable whole number of seconds.
HDOP Horizontal Dilution of Precision.
host system The device or instrument connected to the Acutime 2000
smart antenna. The host system can be a PC, network
equipment, or timing system, depending on the application.
HOW Hand-over word. The word in the GPS message that
contains time synchronization information for the transfer
from C/A to P-code.