Trimble Outdoors AcutimeTM2000 Synchronization Kit, Part Number 45005-00-ENG manual Glossary

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.

Acutime 2000 Synchronization Kit User Guide Glossary-1