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Glossary
GSR2700 IS Operations Manual 63
G
GPRS— See General Packet Radio Service (GPRS) .
GPS— See Global Positioning System (GPS) .
GSM— See Global System for Mobile Communications (GSM) .
Global Positioning System (GPS)— A space-based radio
positioning system which provides suitably equipped users with
accurate position, velocity, and time data.
Global System for Mobile Communications (GSM)— A digital
cellular phone technology based on TDMA. First introduced in 1991,
the GSM standard has been deployed at three different frequency
bands: 900 MHz, 1800 MHz, and 1900 MHz. GSM uses narrowband
TDMA which allows eight simultaneous calls on the same radio
frequency.
General Packet Radio Service (GPRS)— Technology that allows
mobile phones to be used for sending and receiving data over an
Internet Protocol (IP) based network.
GPS Time— The time system upon which GPS is based. GPS time is
an atomic time system and is related to International Atomic Time in
the following manner: International Atomic Time (IAT) = GPS +
19.000 sec. The IAT and Universal Time Coordinated (UTC) are
closely related. The difference is that UTC contains leap seconds to
adjust for changes in the earth’s rotation. See
Universal Time
Coordinated (UTC) .
I
Integer ambiguity/bias— See Ambiguity .
Integrated Doppler— See Carrier phase .