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

	Glossary
packet	An "envelope" for data, which contains addresses and error
	checking information as well as the data itself.
parity	A scheme for detecting certain errors in data transmission.
	Parity defines the condition (i.e., even or odd) of the number
	of items in a set (e.g., bits in a byte).
PDOP	Position Dilution of Precision. PDOP is a unitless figure of
	merit that describes how an uncertainty in pseudo-range
	affects position solutions.
PDOP	A value, based on PDOP, that defines when the GPS
constellation	receiver/processor should switch between 2-D and 3-D GPS
switch	modes. The PDOP constellation switch is only active when
	the GPS mode of operation is set to Auto.
PRN	Pseudo-random noise. Each GPS satellite generates its own
	distinctive PRN code, which is modulated onto each carrier.
	The PRN code serves as identification of the satellite, as a
	timing signal, and as a subcarrier for the navigation data.
protocol	A formal set of rules that describe a method of
	communication. The protocol governs the format and
	control of inputs and outputs.
pseudo-range	A measure of the range from the GPS antenna to a GPS
	satellite. Pseudo-range is obtained by multiplying the speed
	of light by the apparent transit time of the signal from the
	GPS satellite. Pseudo-range differs from actual range
	because the satellite and user clocks are offset from GPS
	time and because of propagation delays and other errors.
RAM	Random-Access Memory.
random-access	Memory in which information can be referred to in an
memory	arbitrary or random order. The contents of RAM are lost
	when the System Unit is turned off.

Acutime 2000 Synchronization Kit User Guide Glossary-9