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

Glossary

differential	Determination of relative coordinates of two or more
relative	receivers which are simultaneously tracking the same
positioning	satellites. Static differential GPS involves determining
	baseline vectors between pairs of receivers. Also see
	differential GPS.
dilution of	A description of the purely geometrical contribution to the
precision	uncertainty in a position fix, given by the expression DOP =
	SQRT TRACE (A A) where A A is the design matrix for the
	instantaneous position solution (dependent on satellite-
	receiver geometry). The DOP factor depends on the
	parameters of the position-fix solution. Standard terms for
	the GPS application are:
	GDOP – Geometric (three position coordinates plus clock
	offset in the solution)
	PDOP – Position (three coordinates)
	HDOP – Horizontal (two horizontal coordinates)
	VDOP – Vertical (height only)
	TDOP – Time (clock offset only)
	RDOP – Relative (normalized to 60 seconds)
DOP	See dilution of precision.
Doppler shift	The apparent change in frequency of a received signal due
	to the rate of change of the range between the transmitter
	and receiver.
earth-centered	Cartesian coordinate system where the X direction is the
earth-fixed	intersection of the prime meridian (Greenwich) with the
(ECEF)	equator. The vectors rotate with the earth. Z is the direction
	of the spin axis.
elevation angle	The angle between the line of sight vector and the horizontal
	plane.

Glossary-4 Acutime 2000 Synchronization Kit User Guide