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 o nly be determined if
signals from four or more satellites are available.
almanac A reduced-precision subset of the ephemeri s 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 s atellites in the
system.