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Acutime 2000 Synchronization Kit User Guide Glossary-1
Glossary
This section defines technical terms and abbreviations used in this manual. It includes terms
from the field of GPS technology.
2-D Two Dimensional. A 2-D position is defined as latitude and
longitude. Altitude is assumed to be fixed.
2-D GPS mode A procedure of determining a 2-D position using signals
received from the best (or only) three available GPS
satellites. Altitude is assumed to be known and constant. A
2-D position solution will only be determined if signals
from three or more satellites are available.
3-D Three Dimensional. A 3-D position is defined as latitude,
longitude, and altitude.
3-D GPS mode A procedure of determining a 3-D position using signals
received from the best (or only) four available GPS
satellites. A 3-D position solution will only be determined if
signals from four or more satellites are available.
almanac A reduced-precision subset of the ephemeris parameters.
Used by the receiver to compute the elevation angle,
azimuth angle, and estimated Doppler of the satellites. Each
satellite broadcasts the almanac for all the satellites in the
system.